Professional Isotherm Ceiling Insulation Installation by Cape Ceilings & Drywalling

Isotherm insulation has become one of South Africa’s most recognised polyester ceiling insulation products, offering homeowners and businesses an effective way to improve indoor comfort while reducing heat transfer through the roof. Manufactured from thermally bonded polyester fibres produced from recycled PET plastic bottles, Isotherm provides reliable thermal insulation without the use of traditional glasswool fibres.

At Cape Ceilings & Drywalling, we specialise in the professional installation of Isotherm ceiling insulation throughout Cape Town and the Western Cape. With more than 36 years of insulation installation experience, we understand that achieving the best thermal performance depends not only on selecting the correct insulation thickness but also on installing it correctly.

Even high-quality insulation can lose much of its effectiveness if it is compressed, poorly fitted or installed with gaps around roof trusses, electrical services and ceiling penetrations. Our experienced installation teams carefully measure, cut and install every section of Isotherm insulation to provide continuous ceiling coverage while maintaining the product’s designed thermal performance.

Whether you are building a new home, upgrading an existing property, renovating commercial offices or insulating an industrial building, we provide professional workmanship, honest advice and reliable installation solutions tailored to your project.

Every installation completed by Cape Ceilings & Drywalling is backed by our 5-Year Workmanship Warranty, giving you confidence that your insulation has been installed to the highest professional standard.

Why Choose Isotherm Insulation Installation?

Installing ceiling insulation is one of the most effective long-term improvements you can make to your property. By slowing the movement of heat through the roof, Isotherm insulation helps create a more comfortable indoor environment while reducing the amount of energy required to heat and cool the building.

Professionally installed Isotherm insulation offers numerous benefits, including:

Cooler indoor temperatures during summer.
Warmer living areas throughout winter.
Reduced electricity consumption.
Lower heating and cooling costs.
Improved year-round comfort.
Better acoustic performance.
Long service life.
Reduced environmental impact through the use of recycled materials.
Increased property appeal.
Improved overall building efficiency.

Many homeowners notice the difference almost immediately after installation, particularly during periods of extreme summer heat or cold winter mornings. By reducing heat entering and leaving the building through the ceiling, Isotherm insulation helps maintain more consistent indoor temperatures throughout the year.

What is Isotherm Insulation?

Isotherm is a polyester ceiling insulation manufactured from thermally bonded polyester fibres produced using recycled PET plastic bottles. Rather than relying on traditional glass fibres, the polyester fibres are bonded together using heat to form a stable insulation blanket that provides reliable thermal and acoustic performance.

This manufacturing process produces an insulation product that is lightweight, durable and easy to install while contributing to the recycling of plastic materials that might otherwise end up in landfill.

Unlike traditional glasswool insulation, Isotherm contains no loose glass fibres. This gives the product a soft, flexible texture that many installers and homeowners find easy to work with during installation.

Professionally installed Isotherm insulation helps reduce heat transfer through the roof while also contributing to improved sound absorption within the building.

It is commonly installed in:

Residential homes.
Townhouses.
Apartment buildings.
Office complexes.
Schools.
Hospitals.
Warehouses.
Factories.
Retail centres.
Hotels.
Guest houses.
Community buildings.

Its versatility makes it suitable for both new construction and retrofit insulation projects throughout the Western Cape.

Why Professional Installation Matters

Although Isotherm insulation is manufactured to deliver reliable thermal performance, the quality of the installation plays a major role in determining how effectively it performs over the life of the building.

At Cape Ceilings & Drywalling, we have inspected many roof spaces where insulation has been installed incorrectly. Common issues such as gaps between insulation sections, compressed insulation, incomplete ceiling coverage and poorly fitted areas around roof trusses can significantly reduce the product’s ability to resist heat transfer.

Our installation teams take the time to:

Measure every ceiling accurately.
Cut insulation neatly around structural members.
Maintain the full thickness of the insulation.
Minimise gaps throughout the roof space.
Work carefully around electrical wiring and plumbing services.
Inspect the completed installation before handover.

This attention to detail helps ensure the insulation performs as designed while delivering long-term comfort and energy savings.

Isotherm Specifications

Specification	Isotherm Insulation
Material	Thermally bonded polyester fibres
Manufactured from	Recycled PET plastic bottles
Available Thicknesses	145mm, 135mm, 100mm, 75mm, 50mm
Applications	Residential, Commercial & Industrial
Acoustic Performance	Excellent sound absorption
Thermal Performance	High thermal efficiency
Fire Classification	B/B 1/2
Installation	Ceiling and roof applications
Expected Service Life	Decades when correctly installed
Warranty	5-Year Workmanship Warranty (Installation)

Isotherm Insulation Thickness Options

One of the advantages of Isotherm insulation is that it is available in a wide range of thicknesses, allowing homeowners, builders and commercial property owners to select the most appropriate insulation for their building and energy-efficiency requirements.

At Cape Ceilings & Drywalling, we install the complete Isotherm ceiling insulation range and will recommend the most suitable thickness based on your roof design, budget, thermal performance goals and the intended use of the building.

The Isotherm insulation range includes:

145mm Isotherm Insulation
135mm Isotherm Insulation
100mm Isotherm Insulation
75mm Isotherm Insulation
50mm Isotherm Insulation

Each thickness provides different levels of thermal resistance and is suited to different applications.

145mm Isotherm Insulation Installation

The 145mm Isotherm is the thickest product in the standard Isotherm range and provides the highest level of thermal performance.

It is designed for homeowners and commercial clients looking for maximum year-round comfort and the greatest reduction in heat transfer through the roof.

This insulation is particularly well-suited to:

Premium residential homes.
Luxury developments.
New homes.
Energy-efficient buildings.
Office developments.
Schools.
Healthcare facilities.
High-performance building projects.

Typical Benefits

Maximum thermal performance within the Isotherm range.
Excellent summer heat reduction.
Improved winter heat retention.
Reduced reliance on heating and cooling systems.
Greater long-term energy savings.
Improved indoor comfort throughout the year.

For customers planning to remain in their homes for many years, 145mm Isotherm is often the preferred choice where roof space allows.

135mm Isotherm Insulation Installation

The 135mm Isotherm offers excellent thermal performance while remaining suitable for a wide variety of residential and commercial applications.

It has become a popular option for customers who want a high-performing insulation system without necessarily selecting the thickest available product.

Ideal applications include:

Residential homes.
Double-storey houses.
Townhouses.
Office buildings.
Guest houses.
Schools.
Medical facilities.
Commercial renovations.

Advantages

Excellent year-round thermal comfort.
Lower electricity consumption.
Reliable acoustic performance.
Long service life.
Suitable for both new and existing buildings.

For many homeowners, 135mm provides an excellent balance between performance and overall project cost.

100mm Isotherm Insulation Installation

The 100mm Isotherm remains one of the most widely used insulation thicknesses in South African homes.

It delivers dependable thermal performance while offering an attractive balance between installation cost and long-term energy savings.

It is commonly installed in:

Existing homes.
New housing developments.
Apartment buildings.
Offices.
Retail premises.
Renovation projects.
Holiday homes.

Why Choose 100mm?

Strong thermal performance.
Good value for money.
Suitable for most residential roof structures.
Improved indoor comfort.
Lower heating and cooling costs.

Many homeowners find that 100mm Isotherm provides excellent everyday performance for typical residential applications.

75mm Isotherm Insulation Installation

The 75mm Isotherm is often selected where moderate insulation performance is required or where roof space limitations influence the choice of insulation thickness.

Applications include:

Budget-conscious residential projects.
Garages connected to homes.
Utility buildings.
Renovation work.
Certain commercial applications.

Benefits

Improved thermal comfort.
Reduced heat transfer.
Better acoustic performance than an uninsulated ceiling.
Cost-effective insulation solution.
Suitable for a wide range of building types.

Although thinner than the premium options, the 75mm Isotherm still delivers noticeable improvements compared to an uninsulated roof.

50mm Isotherm Insulation Installation

The 50mm Isotherm is the entry-level option within the Isotherm range.

It is generally used where space restrictions prevent thicker insulation from being installed or where moderate levels of insulation are considered appropriate.

Typical applications include:

Garages.
Workshops.
Storage buildings.
Utility rooms.
Smaller commercial spaces.
Budget-sensitive projects.

Advantages

Improved thermal performance over an uninsulated ceiling.
Lightweight and easy to install.
Suitable where the roof cavity depth is limited.
Helps reduce heat transfer.
Improves comfort in smaller spaces.

While 50mm Isotherm provides worthwhile thermal benefits, customers looking for maximum energy efficiency should consider the thicker Isotherm options where practical.

Choosing the Right Isotherm Thickness

Selecting the correct insulation thickness depends on several factors, including:

Your available roof space.
Building design.
Climate conditions.
Energy-saving objectives.
Budget.
Whether the property is new or existing.
Long-term occupancy plans.

During our site inspection, we assess these factors carefully before recommending the most suitable Isotherm insulation solution for your project.

Rather than recommending the thickest product for every building, we provide practical advice based on what will deliver the best long-term performance and value for your specific property.

Professional Advice Makes the Difference

Every building is unique, and there is no single insulation thickness that suits every application.

With more than 36 years of insulation installation experience, Cape Ceilings & Drywalling has helped thousands of homeowners and businesses choose the right ceiling insulation for their needs.

Our experienced team will explain the advantages of each Isotherm thickness, answer your questions and prepare a detailed quotation so you can make an informed decision with confidence.

By combining the correct Isotherm product with professional installation, we help create more comfortable buildings, more energy efficient and better prepared for South Africa’s changing seasonal temperatures.

Why Professional Isotherm Insulation Installation Matters

Choosing Isotherm insulation is an investment in the long-term comfort and energy efficiency of your property. However, even the highest-quality insulation cannot perform to its full potential if it has not been installed correctly.

At Cape Ceilings & Drywalling, we have more than 36 years of insulation installation experience, and one lesson has remained constant throughout that time—professional workmanship makes a significant difference to the long-term performance of any insulation system.

During our roof inspections, we regularly find installations where good insulation products have been compromised by poor workmanship. Gaps, compressed insulation, incomplete ceiling coverage and incorrect fitting around roof structures all reduce the insulation’s ability to slow heat transfer.

Professional installation helps ensure your Isotherm insulation performs exactly as it was designed while continuing to provide reliable thermal and acoustic benefits for many years.

Correct Installation Preserves Thermal Performance

Isotherm insulation works by trapping air within its thermally bonded polyester fibre structure. This slows the movement of heat through the ceiling, helping maintain more comfortable indoor temperatures.

If the insulation is compressed, poorly positioned or fitted with unnecessary gaps, its thermal efficiency is reduced.

Our experienced installers carefully fit each section of insulation while maintaining its full thickness, allowing the product to perform at its intended level.

Maintaining the insulation’s loft and structure is one of the most important aspects of a professional installation.

Preventing Gaps Throughout the Ceiling

Small gaps may seem insignificant, but they allow heat to bypass the insulation layer.

These thermal weak points reduce the overall efficiency of the insulation system and can create uneven temperatures inside the building.

Our installation teams carefully fit Isotherm insulation around:

Roof trusses.
Ceiling access hatches.
Electrical wiring.
Plumbing pipes.
Roof bracing.
Air-conditioning ducting.
Ventilation equipment.
Structural supports.
Ceiling bulkheads.

By minimising unnecessary gaps wherever practical, we help maximise the thermal performance of the entire ceiling.

Avoiding Unnecessary Compression

Unlike many building materials, insulation should never be compressed unnecessarily.

Flattening the insulation reduces its thickness and limits its ability to resist heat transfer.

Compression often occurs when:

Heavy objects are stored in the roof.
Tradespeople walk on the insulation.
Water tanks are installed directly on top of it.
Air-conditioning equipment is added after installation.
Roof maintenance is carried out without care.

Our installers position the insulation correctly while preserving its designed thickness to help achieve the best possible thermal performance.

Working Around Electrical Wiring

Modern roof spaces contain a growing number of electrical services.

These may include:

General electrical wiring.
Solar power cabling.
Alarm systems.
Fibre internet installations.
Television cabling.
Security systems.
Junction boxes.
Ceiling lighting.

Our experienced installation teams carefully work around these services while maintaining continuous insulation coverage wherever practical and avoiding unnecessary disturbance.

Professional Installation Around Plumbing and Air-Conditioning Services

Roof spaces often contain plumbing pipes, ventilation systems and air-conditioning ducting that require careful consideration during installation.

Rather than forcing insulation around these obstacles, we carefully trim and fit each section to maintain a neat, professional installation while preserving the effectiveness of the insulation.

Attention to these details helps eliminate unnecessary gaps and contributes to better long-term performance.

Downlights and Ceiling Penetrations

Lighting fixtures and ceiling penetrations require careful planning during every insulation project.

Our installation teams assess each roof space individually and install the insulation using good industry practices while taking into account the type of ceiling fittings already in place.

Every roof is different, which is why experience plays such an important role in achieving a safe and effective installation.

Roof Truss Configurations

South African buildings use a wide variety of roof structures.

Over the years, we have installed Isotherm insulation in roofs containing:

Traditional timber trusses.
Lightweight steel trusses.
Complex roof framing.
Multi-level roof systems.
Double-volume ceilings.
Cathedral ceilings.
Renovated roof structures.

Our experience enables us to adapt the installation method to suit each roof while maintaining excellent insulation coverage.

Ceiling Access Hatches

Access hatches are frequently overlooked during insulation installations.

Without proper attention, these areas can become points where heat enters or escapes the building.

As part of every installation, we assess the ceiling access area and recommend practical solutions where appropriate to help maintain continuous thermal protection.

Every Installation Includes a Quality Inspection

Installing the insulation is only part of the process.

Before every project is completed, we carry out a final inspection to ensure:

Continuous insulation coverage.
Correct positioning.
Minimal thermal gaps.
No unnecessary compression.
Safe roof access.
Neat workmanship.
Roof services remain accessible where required.

Only after these checks have been completed do we consider the installation finished.

Experience That Delivers Long-Term Results

Professional installation is about far more than laying insulation between roof trusses.

It involves:

Careful planning.
Accurate measurements.
Experienced workmanship.
Attention to detail.
Safe working practices.
Thorough quality control.

These are the factors that help determine how well your insulation performs over the next twenty to thirty years.

At Cape Ceilings & Drywalling, we approach every Isotherm installation with the same commitment to quality that has earned us the trust of homeowners, builders and commercial clients throughout Cape Town and the Western Cape for more than 36 years.

By combining premium Isotherm insulation with professional installation, we help create buildings that are more comfortable, more energy efficient and built to perform for decades.

Common Problems We Find During Roof Inspections Before Installing Isotherm Insulation

Every professional Isotherm insulation installation begins with a careful inspection of the roof space. Over more than 36 years of installing ceiling insulation, we have worked in thousands of homes, offices, factories and commercial buildings throughout Cape Town and the Western Cape.

One thing we have learned is that very few roof spaces are perfect.

Many buildings contain insulation that has deteriorated over time, been disturbed during maintenance work or was never installed correctly in the first place. Identifying these issues before installation allows us to recommend the best solution while ensuring your new Isotherm insulation delivers the maximum possible thermal performance.

Below are some of the most common problems we encounter during our roof inspections.

Homes With No Ceiling Insulation

Despite increasing awareness of energy efficiency, many older South African homes still have no ceiling insulation at all.

Without insulation, the roof becomes one of the largest sources of heat gain during summer and heat loss during winter.

These homes often experience:

Extremely hot rooms during summer afternoons.
Cold indoor temperatures during winter.
Higher electricity consumption.
Increased reliance on heaters and air conditioners.
Greater day-to-night temperature fluctuations.

Installing Isotherm insulation can significantly improve comfort while helping reduce energy costs throughout the year.

Incomplete Insulation Coverage

One of the most common problems we find is insulation that covers only part of the ceiling.

Examples include:

Bedrooms insulated while living areas remain exposed.
Hallways left without insulation.
Garages excluded from the original installation.
Home extensions are never insulated.
Renovated sections overlooked.

Even relatively small uncovered areas create thermal weak points that reduce the effectiveness of the entire insulation system.

Gaps Around Roof Access Hatches

Roof access hatches are frequently forgotten during insulation installations.

Without proper attention, these openings allow heat to enter the building during summer and escape during winter.

As part of our installation process, we assess these areas carefully and recommend practical solutions to help maintain consistent thermal protection.

Existing Insulation That Has Been Compressed

We regularly inspect roof spaces where insulation has been flattened over time.

Common causes include:

Boxes stored in the roof.
Timber and building materials.
Water tanks.
Air-conditioning equipment.
Repeated foot traffic by contractors.
Roof maintenance work.

Compressed insulation cannot perform as effectively because its thickness has been reduced.

Where appropriate, we recommend replacing damaged insulation to restore the ceiling’s thermal efficiency.

Roof Leaks and Water Damage

Water damage remains one of the biggest reasons older insulation loses its effectiveness.

During roof inspections we often discover insulation that has been:

Saturated by roof leaks.
Compressed after drying.
Torn during repairs.
Permanently damaged by prolonged moisture exposure.

Before installing new Isotherm insulation, we recommend repairing any active roof leaks to protect both the insulation and the roof structure.

Insulation Disturbed During Renovations

Renovation projects often involve electricians, plumbers, air-conditioning technicians and builders working inside the roof space.

Unfortunately, insulation is not always returned to its original position once the work has been completed.

We frequently find:

Large uncovered ceiling sections.
Folded insulation.
Missing pieces.
Uneven coverage.
Poorly repositioned insulation.

Correcting these issues restores the insulation’s ability to provide consistent thermal protection.

Solar Installations Moving Existing Insulation

The growing popularity of residential solar systems has increased the amount of work taking place inside roof spaces.

Solar installers sometimes need to move insulation to install electrical cabling, mounting systems or related equipment.

If the insulation is not repositioned afterwards, gaps are created that reduce its thermal performance.

During our inspections, we identify these areas and restore continuous insulation coverage where practical.

Rodent Activity in Roof Spaces

Although Isotherm insulation itself is not manufactured as a food source for rodents, roof spaces can still be affected if pests gain access through damaged roof coverings or unsealed openings.

Signs we occasionally encounter include:

Rodent droppings.
Nesting materials.
Disturbed insulation.
Chewed packaging left from previous work.
Damaged roof access points.

Where pest activity is evident, we recommend resolving the issue before installing new insulation.

Bird Nests Inside Roof Cavities

Small birds can sometimes enter roof spaces through damaged tiles, loose flashing or other openings.

This may result in:

Nesting material.
Debris on top of existing insulation.
Disturbed insulation.
Reduced insulation coverage in affected areas.

Repairing entry points before installation helps protect the insulation and maintain a cleaner roof environment.

Poor DIY Insulation Installations

Some homeowners choose to install insulation themselves.

While many projects are completed with good intentions, we often find:

Uneven insulation thickness.
Large gaps between sections.
Incorrect cutting.
Missing insulation around roof trusses.
Excessive compression.
Loose insulation rolls.

Professional installation helps eliminate these issues while ensuring the insulation performs as intended.

Builders Taking Shortcuts

During inspections of newer homes, we occasionally find insulation that has been installed simply to meet minimum building requirements rather than to maximise thermal performance.

Examples include:

Thin insulation where thicker options were specified.
Large uncovered roof sections.
Poor fitting around the roof trusses.
Incomplete installations.
Minimal attention to detail.

Correcting these issues significantly improves the long-term comfort and energy efficiency of the building.

Mixed Insulation Products

Many older properties contain several different insulation products installed over many years.

Examples include:

Older polyester insulation combined with newer products.
Glasswool was added during renovations.
Partial Isotherm installations.
Inconsistent insulation thicknesses across different roof sections.

While mixed insulation systems can sometimes perform adequately, inconsistent installation often creates uneven thermal performance.

During our inspection, we recommend the most practical solution for achieving consistent insulation coverage throughout the property.

Difficult Roof Access

Not every roof space offers easy access.

Some properties have:

Low roof pitches.
Complex truss layouts.
Narrow access openings.
Multiple roof levels.
Limited crawl spaces.

These conditions require careful planning and experienced installation techniques.

Our team has worked in virtually every type of roof space over the past 36 years, allowing us to complete even challenging installations safely and professionally.

Every Successful Installation Starts with a Thorough Inspection

The quality of any insulation installation begins long before the first roll of Isotherm is placed inside the roof.

By carefully inspecting the roof structure, identifying existing problems and planning the installation correctly, we can recommend the most suitable solution for your property while ensuring your new Isotherm insulation delivers reliable thermal performance for many years to come.

Our commitment to detailed roof inspections is one of the reasons homeowners, builders and commercial clients continue to trust Cape Ceilings & Drywalling for professional insulation installations throughout Cape Town and the Western Cape.

What We Check Before Every Isotherm Insulation Installation

A successful insulation installation starts long before the first roll of Isotherm insulation is placed inside the roof space.

Every property is different, and every roof presents its own challenges. Before recommending an insulation solution or beginning any installation, our experienced team carries out a thorough assessment of the roof cavity and ceiling structure.

This detailed inspection allows us to identify potential issues, calculate accurate material quantities and recommend the most suitable Isotherm insulation thickness for your building.

By investing time in careful planning, we help ensure every installation delivers reliable thermal performance, long-term durability and excellent workmanship.

Roof Structure Assessment

The first step is understanding how the roof has been constructed.

Different buildings use different roof systems, each requiring a slightly different installation approach.

We assess:

Timber roof trusses.
Lightweight steel trusses.
Roof pitch.
Roof bracing.
Ceiling support members.
Structural condition.
Access routes throughout the roof.

This allows us to plan the safest and most efficient installation method while achieving excellent insulation coverage.

Roof Leak Inspection

Before installing any insulation, we inspect the roof space for evidence of water ingress.

We look for:

Water staining.
Damp roof timbers.
Damaged roof sheeting.
Broken roof tiles.
Rust around roof fasteners.
Previous leak repairs.
Active roof leaks.

If roof leaks are identified, we recommend repairing them before installing new Isotherm insulation to help protect both the insulation and the roof structure.

Existing Insulation Assessment

Many homes already contain some form of ceiling insulation.

We carefully evaluate its condition to determine whether it should remain in place or be replaced.

We inspect for:

Missing sections.
Flattened insulation.
Water damage.
Compression.
Rodent damage.
Bird contamination.
Poor previous workmanship.
Uneven insulation coverage.

This assessment helps us recommend the most practical long-term solution for your property.

Electrical Wiring Inspection

Roof spaces contain numerous electrical services that require careful consideration.

During our inspection, we check for:

General electrical wiring.
Junction boxes.
Solar electrical cabling.
Alarm systems.
Fibre internet cables.
Television wiring.
Ceiling lighting circuits.
Electrical alterations.

If we notice visible damage or obvious safety concerns, we recommend that these be assessed and repaired by a qualified electrician before insulation is installed.

Solar Installation Assessment

Many modern homes now have solar power systems installed.

We inspect:

Solar cabling routes.
Inverter wiring entering the roof.
Battery cabling.
Roof penetrations.
Areas where insulation has previously been moved.

If insulation has been displaced during the solar installation, we restore continuous insulation coverage wherever practical.

Plumbing and Air-Conditioning Services

Roof spaces frequently contain plumbing pipes and HVAC components.

We identify:

Water pipes.
Drainage pipes.
Air-conditioning ducting.
Ventilation systems.
Extractor fan ducting.
Roof-mounted mechanical equipment.

This allows us to carefully fit the insulation around these services while maintaining excellent thermal coverage.

Roof Ventilation Assessment

Good ventilation contributes to a healthy roof space.

During our inspection, we assess:

Existing roof ventilation.
Ridge ventilation.
Gable vents.
Roof vents.
Airflow through the roof cavity.
Areas where ventilation may be restricted.

Where appropriate, we can recommend improvements that complement the insulation system and support long-term roof performance.

Ceiling Penetrations

Every opening through the ceiling requires careful consideration.

We inspect around:

Downlights.
Ceiling access hatches.
Exhaust fans.
Air-conditioning vents.
Plumbing penetrations.
Electrical penetrations.

These areas receive special attention during installation to help minimise unnecessary thermal gaps.

Roof Access and Safety

Some roof spaces are easy to work in, while others require careful planning.

We assess:

Roof access size.
Roof height.
Working space.
Safe movement within the roof.
Fragile ceiling areas.
Restricted access points.

Planning these details before installation allows our team to work efficiently while protecting both the property and our installers.

Pest Activity

Although Isotherm insulation itself is not a food source, roof spaces can still be affected by pests.

During every inspection, we look for signs of:

Rodent activity.
Bird nesting.
Insect infestations.
Animal entry points.
Roof damage caused by pests.

If significant pest activity is found, we recommend addressing the issue before installing new insulation.

Accurate Material Calculations

One of the most important parts of every inspection is calculating exactly how much insulation is required.

We carefully measure:

Total ceiling area.
Individual rooms.
Complex ceiling layouts.
Double-volume ceilings.
Bulkheads.
Irregular roof sections.
Access limitations.

Accurate calculations reduce unnecessary waste while ensuring enough Isotherm insulation is available to complete the installation efficiently.

Every Successful Installation Begins with Careful Planning

Professional insulation installation is about much more than simply placing insulation inside a roof.

It begins with understanding the building, identifying potential challenges and preparing a clear installation plan before any work starts.

At Cape Ceilings & Drywalling, our thorough pre-installation inspections are one of the reasons customers continue to trust us after more than 36 years in the insulation industry.

By carefully assessing every roof space before installation, we help ensure your Isotherm insulation delivers the comfort, energy efficiency and long-term performance you expect from a professionally installed ceiling insulation system.

Where Can Isotherm Insulation Be Installed?

One of the reasons Isotherm insulation has become so popular throughout South Africa is its versatility. Whether you are insulating a family home, upgrading a commercial office or improving the comfort of a large industrial facility, professionally installed Isotherm insulation provides reliable thermal and acoustic performance across a wide range of building types.

At Cape Ceilings & Drywalling, we have installed ceiling insulation in thousands of buildings over the past 36 years. Every installation begins with a detailed assessment of the roof structure, ceiling design and insulation requirements to ensure the most suitable installation method is used.

Regardless of the size or complexity of the project, our goal remains the same—to deliver professional workmanship, complete ceiling coverage and long-term insulation performance.

Residential Homes

Residential homes remain the most common application for Isotherm insulation.

Whether your home was built recently or several decades ago, installing ceiling insulation can dramatically improve year-round comfort while helping reduce electricity costs.

We regularly install Isotherm insulation in:

Single-storey homes.
Double-storey homes.
Luxury residences.
Family homes.
Coastal properties.
Retirement homes.
Holiday homes.
Country homes.
New housing developments.
Renovated properties.

Professionally installed insulation helps create a home that is cooler during summer, warmer throughout winter and more comfortable every day of the year.

Townhouses and Security Estates

Townhouses often have compact roof spaces where correctly fitted insulation is particularly important.

We install Isotherm insulation in:

Security estates.
Sectional title developments.
Cluster housing.
Lifestyle estates.
Retirement villages.
Residential complexes.

By improving thermal efficiency, homeowners benefit from lower heating and cooling costs while enjoying a more comfortable indoor environment.

Apartment Buildings

Top-floor apartments are especially vulnerable to heat entering through the roof during summer.

Installing Isotherm insulation above these ceilings helps reduce heat transfer while improving comfort throughout every season.

Applications include:

Apartment complexes.
Flats.
Penthouse apartments.
Student accommodation.
Residential developments.
Mixed-use buildings.

Developers also benefit by providing buyers with more energy-efficient homes.

Commercial Office Buildings

Maintaining comfortable working conditions is important for employee well-being and productivity.

Isotherm insulation is commonly installed in:

Office parks.
Corporate headquarters.
Professional consulting rooms.
Business centres.
Government offices.
Municipal buildings.
Financial institutions.
Shared office spaces.

Improved thermal efficiency can also help reduce the operating costs associated with heating and air-conditioning systems.

Schools, Colleges and Universities

Educational buildings benefit greatly from improved temperature control throughout the year.

We install Isotherm insulation in:

Primary schools.
High schools.
Universities.
Colleges.
Lecture halls.
Libraries.
Student residences.
Administration buildings.
Training centres.

Comfortable classrooms create better learning environments while improving overall building efficiency.

Hospitals and Healthcare Facilities

Healthcare environments require stable indoor conditions that support patient comfort and staff well-being.

Our healthcare projects include:

Hospitals.
Day clinics.
Medical centres.
Doctors’ consulting rooms.
Dental practices.
Specialist clinics.
Rehabilitation facilities.
Healthcare administration buildings.

Professional insulation also contributes to reducing the ongoing operating costs of climate-control systems.

Hotels, Guest Houses and Hospitality Venues

Guest comfort plays an important role in the hospitality industry.

We regularly install Isotherm insulation in:

Hotels.
Guest houses.
Boutique accommodation.
Lodges.
Bed and breakfast establishments.
Resorts.
Conference venues.
Wedding venues.

Better temperature control and improved acoustic comfort help create a more enjoyable experience for guests throughout the year.

Warehouses and Distribution Centres

Large warehouse roofs absorb considerable amounts of heat during summer.

Installing Isotherm insulation helps:

Improve employee comfort.
Reduce internal temperatures.
Protect stored products.
Improve energy efficiency.
Lower cooling costs.

Warehouses, logistics centres and storage facilities all benefit from improved thermal performance.

Factories and Industrial Buildings

Industrial facilities often have large roof areas that experience significant solar heat gain.

We install Isotherm insulation in:

Manufacturing plants.
Engineering workshops.
Food processing facilities.
Packaging plants.
Textile factories.
Industrial workshops.
Assembly facilities.
Processing plants.

Improving workplace comfort can contribute to a more productive working environment while reducing the demand on cooling systems.

Retail Stores and Shopping Centres

Retail buildings require comfortable shopping environments for customers and staff alike.

Applications include:

Shopping centres.
Retail outlets.
Supermarkets.
Furniture stores.
Hardware stores.
Motor dealerships.
Commercial showrooms.
Shopping malls.

Professionally installed insulation helps maintain more consistent indoor temperatures while improving energy efficiency.

Agricultural Buildings

Agricultural operations often include buildings that benefit from improved insulation.

These include:

Packhouses.
Farm offices.
Agricultural workshops.
Machinery sheds.
Produce storage facilities.
Staff accommodation.
Processing buildings.

Improved temperature control helps create more comfortable working conditions while protecting equipment and stored goods.

Wine Estates and Visitor Facilities

The Western Cape’s wine industry includes many buildings that benefit from improved thermal performance.

We regularly install insulation in:

Wine cellars.
Tasting rooms.
Visitor centres.
Estate offices.
Estate restaurants.
Accommodation facilities.
Conference venues.

Stable indoor temperatures contribute to improved visitor comfort and lower operating costs.

Churches and Community Buildings

Large public buildings often experience considerable heat build-up beneath expansive roof structures.

We install Isotherm insulation in:

Churches.
Community halls.
Civic centres.
Indoor sports facilities.
Clubhouses.
Recreation centres.
Public meeting venues.

These buildings become significantly more comfortable throughout the year after professional ceiling insulation has been installed.

Renovations, Extensions and New Construction

Isotherm insulation is equally suitable for:

New homes.
Home extensions.
Roof replacements.
Ceiling replacements.
Office renovations.
Commercial refurbishments.
Retail fit-outs.
Building upgrades.

Installing insulation during renovation work is often one of the most cost-effective opportunities to improve the building’s long-term energy efficiency.

Every Building Requires a Tailored Installation Approach

No two buildings are identical.

Before every installation, we carefully assess:

Roof construction.
Ceiling type.
Roof truss layout.
Roof pitch.
Existing insulation.
Electrical wiring.
Plumbing services.
Roof ventilation.
Access limitations.
Safety requirements.

This allows us to develop an installation plan that is tailored to the specific property rather than relying on a one-size-fits-all approach.

With more than 36 years of insulation installation experience, Cape Ceilings & Drywalling has the knowledge and expertise to install Isotherm insulation professionally across virtually every type of residential, commercial and industrial building throughout Cape Town and the Western Cape.

New Homes vs Existing Homes – Isotherm Insulation Installation

One of the greatest advantages of Isotherm insulation is its flexibility. Whether you are constructing a brand-new home, renovating an older property or upgrading a building that has never had ceiling insulation, Isotherm can be professionally installed to improve thermal comfort, reduce energy consumption and create a more comfortable indoor environment.

Although the insulation product remains the same, the installation process differs depending on whether the property is under construction or already occupied.

At Cape Ceilings & Drywalling, we have more than 36 years of insulation installation experience and have completed Isotherm installations in both new developments and existing homes throughout Cape Town and the Western Cape.

Every project begins with a detailed roof inspection, allowing us to determine the safest and most effective installation method while ensuring the insulation performs to its full potential.

Installing Isotherm During New Construction

The ideal time to install Isotherm insulation is during the construction phase, before the ceiling boards are fitted.

With the ceiling still open, our installers have unrestricted access to the roof structure, allowing every section of insulation to be installed accurately and efficiently.

This stage also allows electricians, plumbers and other trades to complete their work before the ceiling is closed, reducing the likelihood of future disturbance to the insulation.

During a new-build installation, we:

Inspect the roof structure.
Confirm roof truss spacing.
Measure the complete ceiling area.
Calculate accurate insulation quantities.
Install Isotherm neatly between roof trusses.
Fit insulation around structural members.
Achieve continuous ceiling coverage.
Carry out a final quality inspection before the ceiling is completed.

Installing insulation during construction is generally the fastest and most efficient approach while delivering excellent long-term performance.

Benefits of Installing During Construction

Installing Isotherm before the ceilings are closed offers several important advantages.

These include:

Unrestricted roof access.
Faster installation times.
More accurate fitting.
Complete insulation coverage.
Easier quality inspections.
Reduced labour costs.
Less disruption to other trades.
Maximum long-term thermal performance.

For builders and homeowners alike, this is the most practical stage of the construction process to install ceiling insulation.

Installing Isotherm in Existing Homes

Many homes throughout South Africa were built before ceiling insulation became a standard feature.

Fortunately, Isotherm insulation can usually be installed without removing existing ceilings.

Our installation teams access the roof cavity through the ceiling access hatch and carefully position the insulation above the completed ceiling.

Although retrofit installations require more planning than new construction projects, they still deliver excellent thermal and acoustic performance when completed professionally.

Inspecting the Existing Roof Space

Before beginning any retrofit installation, we carefully inspect the roof cavity to identify anything that may influence the installation process.

During this inspection, we assess:

Roof access.
Roof truss layout.
Existing insulation.
Electrical wiring.
Plumbing services.
Air-conditioning ducting.
Roof ventilation.
Downlights.
Signs of roof leaks.
General roof condition.

This detailed assessment allows us to prepare an accurate quotation while planning the safest and most effective installation method.

Working Around Existing Building Services

Most roof spaces contain a variety of building services that require careful planning during installation.

Our experienced installers regularly work around:

Electrical wiring.
Solar power cabling.
Plumbing pipes.
Air-conditioning ducting.
Ventilation systems.
Alarm wiring.
Fibre internet cables.
Ceiling-mounted extractor fans.
Structural bracing.

Each section of Isotherm insulation is carefully fitted around these services while maintaining continuous ceiling coverage wherever practical.

Protecting Your Existing Ceilings

One of the concerns homeowners often have is whether the installation process could damage their ceilings.

Our experienced installers take every precaution to protect your property while working inside the roof cavity.

We:

Use safe roof access points.
Move carefully across the roof structure.
Avoid placing unnecessary pressure on ceiling boards.
Protect ceiling finishes.
Minimise disruption inside the home.
Leave the roof space clean upon completion.

Our careful working methods allow us to complete installations efficiently while protecting your existing ceilings.

Replacing Older or Damaged Insulation

Many existing homes already contain insulation that has reached the end of its useful life or no longer performs efficiently.

During our inspection, we assess whether the existing insulation remains suitable or whether replacement would provide better long-term results.

Common issues include:

Water damage.
Compressed insulation.
Missing sections.
Rodent damage.
Bird contamination.
Poor workmanship.
Disturbed insulation following electrical work.
Uneven insulation coverage.

Where replacement is recommended, we remove deteriorated insulation where appropriate and install new Isotherm insulation to current installation standards.

Renovations and Home Extensions

Renovation projects provide an excellent opportunity to improve the thermal performance of a property.

We regularly install Isotherm insulation during:

Home extensions.
Roof replacements.
Ceiling replacements.
Loft conversions.
Office refurbishments.
Commercial renovations.
Retail fit-outs.
Building upgrades.

Adding insulation during renovation work is generally more cost-effective than returning once construction has been completed.

Every Roof Requires Its Own Installation Plan

No two roof spaces are exactly alike.

Roof pitch, truss spacing, ceiling design, access limitations and existing services all influence the installation process.

Rather than following a standard approach, we carefully assess every roof before developing an installation plan tailored to the specific property.

This attention to detail helps ensure your Isotherm insulation performs efficiently while providing reliable comfort and energy savings for many years.

Professional Installation for Long-Term Performance

Whether we are insulating a newly built luxury home, upgrading an older family residence or completing a large commercial project, our commitment to quality workmanship never changes.

Every Isotherm insulation installation is completed with careful planning, experienced workmanship and close attention to detail.

With more than 36 years of insulation installation experience, Cape Ceilings & Drywalling continues to provide homeowners, builders and commercial clients with professional insulation solutions designed to improve comfort, reduce energy costs and deliver dependable long-term performance.

Our Professional Isotherm Insulation Installation Process

At Cape Ceilings & Drywalling, every Isotherm insulation installation follows a carefully planned process developed through more than 36 years of practical insulation experience. Whether we are insulating a single-family home or a large commercial facility, our objective is to deliver professional workmanship, reliable thermal performance and complete customer satisfaction.

We believe that successful insulation projects begin with careful planning rather than simply arriving on site with insulation rolls.

From the initial consultation through to the final quality inspection, every stage of the installation is carefully managed to ensure your Isotherm insulation performs efficiently for decades to come.

Step 1 – Initial Consultation

Every insulation project begins with a discussion about your property and your insulation requirements.

During this consultation, we discuss:

The type of building.
Whether the property is new or existing.
Approximate ceiling size.
Existing insulation.
Areas that become excessively hot or cold.
Acoustic concerns.
Energy-saving objectives.
Budget considerations.
Project timeframes.

This information allows us to recommend the most appropriate Isotherm insulation solution before preparing your quotation.

Step 2 – Roof Inspection and Site Assessment

Before installation begins, we carry out a detailed inspection of the roof space wherever practical.

During this assessment, we inspect:

Roof construction.
Roof trusses.
Ceiling type.
Existing insulation.
Roof access.
Electrical wiring.
Plumbing services.
Solar installations.
Roof ventilation.
Downlights.
General roof condition.

A detailed inspection allows us to identify potential challenges before installation begins, helping avoid delays and ensuring a smoother installation process.

Step 3 – Measuring the Ceiling Area

Accurate measurements are essential for a successful insulation installation.

Our experienced team carefully measures:

Total ceiling area.
Individual rooms.
Hallways.
Double-volume ceilings.
Bulkheads.
Complex roof layouts.
Irregular ceiling sections.
Roof access limitations.

These measurements allow us to calculate the correct quantity of Isotherm insulation while minimising unnecessary material waste.

Step 4 – Selecting the Correct Isotherm Thickness

Choosing the correct insulation thickness is one of the most important decisions in any insulation project.

Following our inspection, we recommend the most suitable Isotherm product based on your building, budget and energy-efficiency goals.

Our recommendations may include:

145mm Isotherm

Maximum thermal performance for premium residential and commercial buildings.

135mm Isotherm

Excellent year-round comfort and strong energy-saving performance.

100mm Isotherm

An excellent balance between insulation performance and affordability.

75mm Isotherm

Suitable where moderate insulation performance is appropriate.

50mm Isotherm

Ideal where roof space is limited or moderate insulation levels are required.

We explain the benefits of each option so you can make an informed decision based on your property’s specific needs.

Step 5 – Preparing Your Detailed Quotation

Every quotation is prepared carefully to ensure complete transparency.

Your quotation typically includes:

Recommended Isotherm insulation thickness.
Total ceiling area.
Material quantities.
Installation costs.
Estimated installation timeframe.
Workmanship warranty.
Any preparation required before installation.

We believe customers should understand exactly what is included before work begins.

Step 6 – Preparing the Roof Space

Before installation starts, we prepare the roof space and work area.

Preparation may include:

Confirming safe roof access.
Organising insulation materials.
Checking working areas.
Protecting access points.
Reviewing the installation plan.
Preparing installation equipment.
Confirming project scheduling.

Proper preparation contributes to a safe and efficient installation.

Step 7 – Professional Isotherm Installation

Once preparation has been completed, our experienced installers begin fitting the Isotherm insulation.

Each section is carefully:

Measured.
Trimmed where required.
Positioned between roof trusses.
Installed without unnecessary compression.
Fitted around structural members.
Adjusted around the electrical wiring.
Installed to achieve continuous ceiling coverage.

Special attention is given to:

Roof edges.
Ceiling access hatches.
Roof valleys.
Downlights.
Plumbing pipes.
Air-conditioning ducting.
Solar wiring.
Structural bracing.

Our objective is to provide consistent insulation coverage while maintaining the product’s designed thermal performance.

Step 8 – Final Quality Inspection

After installation has been completed, every project undergoes a comprehensive quality inspection.

We confirm:

Continuous insulation coverage.
Correct insulation positioning.
Minimal thermal gaps.
No unnecessary compression.
Safe roof access.
Accessible roof services were required.
Neat workmanship throughout the roof space.

Only after these checks have been completed do we consider the installation finished.

Step 9 – Site Clean-Up

Professional workmanship includes leaving your property clean and tidy.

Once the installation has been completed, we:

Remove insulation offcuts.
Remove packaging materials.
Clean the work area.
Leave roof access points tidy.
Carry out a final inspection before leaving.

We aim to complete every project with minimal disruption while leaving your property in excellent condition.

Step 10 – Project Handover and 5-Year Workmanship Warranty

Before completing the project, we will review the installation with you and answer any remaining questions.

We also provide guidance on:

Looking after your insulation.
Roof maintenance.
Future electrical work inside the roof space.
Preventing unnecessary disturbance of the insulation.
Maintaining long-term thermal performance.

Every Isotherm insulation installation completed by Cape Ceilings & Drywalling is backed by our 5-Year Workmanship Warranty, giving you confidence that your insulation has been installed by experienced professionals committed to delivering lasting quality.

Why Our Installation Process Delivers Better Results

Installing ceiling insulation is far more than simply placing insulation between roof trusses.

It requires:

Careful planning.
Accurate measurements.
Correct product selection.
Professional workmanship.
Attention to detail.
Thorough quality inspections.
Long-term customer support.

By following the same proven installation process on every project, we help ensure your Isotherm insulation delivers reliable comfort, lower energy costs and dependable performance for decades.

How Isotherm Insulation Improves Energy Efficiency

One of the biggest reasons homeowners and businesses choose Isotherm insulation is to improve the energy efficiency of their buildings. As electricity prices continue to rise across South Africa, reducing heating and cooling costs has become an increasingly important consideration for property owners.

Professionally installed Isotherm insulation helps reduce the transfer of heat through the ceiling, allowing buildings to maintain more stable indoor temperatures throughout the year. By slowing heat entering during summer and reducing heat loss during winter, insulation helps create a more comfortable living and working environment while reducing reliance on heating and cooling systems.

At Cape Ceilings & Drywalling, we have installed Isotherm insulation in thousands of homes and commercial buildings over more than 36 years, and one of the most common comments we receive is how much more comfortable the property feels after the installation has been completed.

Understanding Heat Transfer

Many people assume that most heat enters a building through the walls or windows.

In reality, the roof is often one of the largest sources of heat gain during summer and heat loss during winter.

Throughout the day, the sun heats the roof covering, causing temperatures inside the roof cavity to rise significantly.

Without ceiling insulation, this heat passes through the ceiling into the rooms below.

During winter, the process is reversed.

Warm indoor air naturally rises towards the ceiling and, without insulation, much of this heat escapes into the roof space before being lost through the roof.

Isotherm insulation slows this movement of heat in both directions, helping maintain a far more stable indoor environment throughout every season.

Cooler Homes During Summer

Cape Town experiences long periods of intense sunshine during the summer months.

Without insulation, roof spaces can become extremely hot, causing indoor temperatures to increase throughout the day.

Professionally installed Isotherm insulation helps:

Reduce heat entering through the ceiling.
Slow radiant heat transfer.
Improve indoor comfort.
Reduce hot spots inside the home.
Support more comfortable sleeping conditions.
Create a cooler indoor environment.

Many homeowners notice that their homes remain comfortable for longer, even during the hottest afternoons.

Warmer Homes During Winter

Winter temperatures in the Western Cape often result in significant heat loss through uninsulated ceilings.

Once warm air escapes through the roof, heaters must work harder to replace the lost heat.

Professionally installed Isotherm insulation helps:

Retain indoor warmth.
Reduce heat loss.
Improve overnight comfort.
Keep bedrooms warmer.
Maintain more consistent indoor temperatures.
Reduce reliance on portable heaters.

The result is a home that feels warmer while using less energy.

Lower Electricity Bills

Heating and cooling systems are among the largest consumers of electricity in most buildings.

By reducing unwanted heat transfer, Isotherm insulation allows these systems to operate more efficiently.

Potential benefits include:

Reduced air-conditioner operating time.
Lower heating costs.
Reduced electricity consumption.
Improved overall energy efficiency.
Lower monthly utility expenses.

Although every building performs differently depending on its design and occupancy, professionally installed ceiling insulation is widely regarded as one of the most effective long-term energy-saving improvements available.

Reduced Demand on Heating and Cooling Systems

Heating and cooling equipment work hardest when indoor temperatures change rapidly.

Isotherm insulation helps create a more stable indoor climate, reducing the workload placed on climate-control systems.

Potential advantages include:

Reduced wear on air conditioners.
Less strain on heating systems.
Improved HVAC efficiency.
Lower maintenance requirements.
Longer equipment service life.

Reducing unnecessary demand on these systems contributes to lower operating costs over many years.

Improved Indoor Comfort

While reducing electricity costs is important, many homeowners say the greatest benefit of ceiling insulation is the noticeable improvement in comfort.

Professionally installed Isotherm insulation helps create:

More even room temperatures.
Fewer hot and cold spots.
Improved sleeping conditions.
Greater comfort throughout the year.
A more pleasant indoor environment.
Better overall living conditions.

These improvements are experienced every day, making insulation one of the most rewarding long-term investments for any property.

A Long-Term Investment

Unlike many home improvements that require regular maintenance or replacement, ceiling insulation continues performing quietly above the ceiling for decades.

Once professionally installed, Isotherm insulation requires very little attention while continuing to provide:

Lower energy consumption.
Improved indoor comfort.
Better thermal efficiency.
Increased property appeal.
Long-term financial value.

For many homeowners, the reduction in energy consumption over the life of the insulation helps offset the initial installation cost.

Manufactured from Recycled PET Plastic Bottles

One of the characteristics that distinguishes Isotherm from many other insulation products is its use of recycled PET plastic bottles in the manufacturing process.

These recycled materials are transformed into thermally bonded polyester fibres, creating an insulation product that contributes to reducing plastic waste while delivering reliable thermal performance.

For homeowners, architects and developers interested in environmentally responsible building practices, Isotherm offers an insulation solution manufactured with recycled materials while helping improve the energy efficiency of the completed building.

Sustainable Buildings Begin with Energy Efficiency

Reducing energy consumption benefits both property owners and the environment.

By helping buildings maintain comfortable temperatures naturally, Isotherm insulation reduces the amount of electricity required for heating and cooling throughout the year.

When combined with thoughtful building design and professional installation, ceiling insulation contributes to more sustainable homes and commercial buildings while helping reduce long-term operating costs.

Professional Installation Maximises Energy Performance

Even the highest-quality insulation cannot deliver its full potential if it has been installed incorrectly.

Common installation problems such as:

Gaps between insulation sections.
Excessive compression.
Missing ceiling coverage.
Poor fitting around the roof trusses.
Disturbed insulation after maintenance work.

can all reduce the insulation’s effectiveness.

At Cape Ceilings & Drywalling, every Isotherm installation is completed with careful attention to detail.

Our experienced installers:

Measure accurately.
Fit insulation neatly between roof trusses.
Preserve the insulation’s full thickness.
Minimise thermal gaps.
Work carefully around electrical and plumbing services.
Carry out detailed quality inspections.

This professional approach helps ensure your Isotherm insulation continues delivering reliable thermal performance, lower energy costs and improved comfort for many years.

Energy Efficiency That Lasts for Decades

Whether you own a family home, office building, warehouse or industrial facility, professionally installed Isotherm insulation is an investment that continues delivering benefits long after installation has been completed.

Combined with more than 36 years of professional insulation experience, Cape Ceilings & Drywalling provides Isotherm insulation solutions that help create buildings that are more comfortable, more energy efficient and better prepared for South Africa’s changing climate.

Fire Performance, Moisture Resistance and Long-Term Durability

When selecting ceiling insulation, thermal performance is only one consideration. Homeowners, builders, architects and commercial property owners also want to know that the insulation they choose will provide reliable long-term performance while contributing to a safe, healthy and durable building.

Isotherm insulation has been used in South African homes and commercial buildings for many years and is recognised for its reliable thermal performance, sound absorption and long service life. Manufactured from thermally bonded polyester fibres using recycled PET plastic bottles, Isotherm provides an insulation solution that continues performing year after year when professionally installed and protected within a well-maintained roof space.

At Cape Ceilings & Drywalling, every Isotherm installation begins with a detailed inspection of the roof cavity to ensure the insulation is installed safely and is positioned to deliver its maximum long-term performance.

Fire Performance of Isotherm Insulation

Fire safety is an important consideration in every building project.

Isotherm insulation has been tested and carries a B/B 1/2 fire classification, making it suitable for use in a wide range of residential, commercial and industrial applications where it is installed in accordance with the manufacturer’s recommendations and applicable building requirements.

Professional insulation installation should always form part of an overall building design that considers structural fire safety, electrical installations and compliance with relevant regulations.

At Cape Ceilings & Drywalling, we ensure every installation is completed with careful attention to good workmanship and safe installation practices.

Why Roof Space Safety Matters

The roof cavity contains numerous building services that require careful consideration before insulation is installed.

These commonly include:

Electrical wiring.
Junction boxes.
Solar electrical systems.
Plumbing pipes.
Air-conditioning ducting.
Roof ventilation systems.
Ceiling lighting.
Communication cabling.

Before installation begins, we carefully inspect the roof space for visible issues that may require attention.

Where appropriate, we recommend that damaged electrical wiring or other obvious safety concerns be assessed and repaired by a qualified electrician before new insulation is installed.

Professional Installation Supports Safe Building Practices

A professional installation helps maintain an organised and accessible roof space.

Our experienced installers:

Work carefully around electrical services.
Avoid unnecessary disturbance of existing building systems.
Maintain access to important roof equipment where required.
Install insulation neatly around structural members.
Leave the roof cavity clean and organised.

Careful workmanship contributes to both long-term insulation performance and a well-maintained roof environment.

Moisture Resistance

Cape Town’s Mediterranean climate brings dry summers and wet winters, while coastal areas experience increased humidity throughout the year.

When installed inside a dry, weatherproof roof space, Isotherm insulation is designed to provide reliable thermal and acoustic performance under normal building conditions.

Although the polyester fibres themselves are not affected by normal atmospheric humidity in the way some natural materials can be, maintaining a sound, leak-free roof remains essential for protecting both the insulation and the building structure.

Good roof maintenance remains one of the most important factors in ensuring long-term insulation performance.

Resistance to Mould and Mildew

One question we are often asked is whether ceiling insulation contributes to mould growth.

Isotherm insulation is manufactured from synthetic polyester fibres and does not provide a food source for mould or mildew.

When installed inside a dry, properly maintained roof space with adequate ventilation, the insulation contributes to a healthy indoor environment while continuing to provide reliable thermal performance.

Should roof leaks occur, they should be repaired promptly to protect the roof structure, ceiling finishes and insulation.

Condensation and Roof Ventilation

Condensation develops when warm, moisture-laden air meets cooler surfaces.

While insulation is not a replacement for proper roof ventilation, Isotherm insulation helps reduce temperature differences across the ceiling, contributing to a more stable indoor environment.

For buildings where condensation has been an ongoing concern, we may recommend improvements to roof ventilation alongside the insulation installation to support long-term roof health.

Performance in Coastal Areas

Properties along the Cape coastline are regularly exposed to humidity, salt-laden air and changing weather conditions.

We have successfully installed Isotherm insulation in homes and commercial buildings throughout:

Blouberg.
Table View.
Melkbosstrand.
Langebaan.
Saldanha.
Vredenburg.
Jacobsbaai.
Yzerfontein.
St Helena Bay.
Paternoster.

When protected by a well-maintained roof covering, professionally installed Isotherm insulation provides dependable performance in these coastal environments while helping improve indoor comfort throughout the year.

Long-Term Durability

Ceiling insulation is a long-term investment, and durability is one of Isotherm’s key strengths.

Once professionally installed and protected from roof leaks or unnecessary disturbance, Isotherm insulation is designed to continue delivering reliable thermal and acoustic performance for many years.

Unlike building products that require regular servicing or replacement, ceiling insulation generally performs quietly above the ceiling with very little maintenance.

This makes it one of the most cost-effective improvements for homeowners seeking long-term comfort and energy efficiency.

Looking After Your Isotherm Insulation

Although maintenance requirements are minimal, periodic roof inspections are recommended.

Following severe weather or roof repairs, we suggest checking for:

Roof leaks.
Damaged roof coverings.
Water staining.
Disturbed insulation.
Rodent activity.
Electrical work affecting insulation.
Heavy storage is compressing the insulation.

Addressing these issues promptly helps preserve the insulation’s performance and extends its service life.

Built to Deliver Long-Term Performance

Isotherm insulation has earned its reputation by providing dependable thermal performance, good acoustic comfort and long service life in homes and commercial buildings throughout South Africa.

Combined with professional installation by Cape Ceilings & Drywalling, Isotherm insulation provides a practical, reliable solution for property owners seeking improved comfort, lower energy consumption and lasting value.

With more than 36 years of insulation installation experience, we are committed to ensuring every Isotherm installation delivers the quality, workmanship and long-term performance our customers expect.

Why Choose Cape Ceilings & Drywalling for Isotherm Insulation Installation?

Selecting the right insulation is only part of creating a comfortable and energy-efficient building. The quality of the installation plays an equally important role in determining how effectively your insulation performs over the coming decades.

At Cape Ceilings & Drywalling, we have been professionally installing ceiling insulation throughout Cape Town and the Western Cape for more than 36 years. During that time, we have worked on thousands of residential, commercial and industrial projects, earning a reputation for quality workmanship, honest advice and dependable service.

Whether we are installing Isotherm insulation in a family home, a school, a warehouse or a large commercial development, every project receives the same careful planning and professional attention to detail.

Our objective is simple—to provide insulation installations that improve comfort, reduce energy costs and continue performing for many years.

More Than 36 Years of Practical Experience

Experience matters when working inside roof spaces.

Over more than three decades, we have worked with virtually every type of roof structure found in South Africa.

Our experience includes:

Residential homes.
Luxury properties.
Double-storey homes.
Apartment developments.
Schools.
Universities.
Hospitals.
Hotels.
Office parks.
Shopping centres.
Warehouses.
Manufacturing facilities.
Agricultural buildings.
Government projects.
Renovation projects.
New housing developments.

This practical experience allows us to recommend the most suitable Isotherm insulation solution for every project rather than applying a one-size-fits-all approach.

Specialists in Ceiling Insulation Installation

Ceiling insulation is one of our core areas of expertise.

Unlike general building contractors who occasionally install insulation, our team specialises in insulation systems and understands the details that influence long-term performance.

We focus on:

Selecting the correct insulation thickness.
Accurate quantity calculations.
Proper fitting between roof trusses.
Maintaining the insulation’s full thickness.
Minimising thermal gaps.
Working safely around electrical and plumbing services.
Completing thorough quality inspections.

This specialist knowledge helps ensure your Isotherm insulation delivers the performance it was designed to achieve.

Honest Advice Based on Your Property

Every building is different, and every customer has different priorities.

Rather than recommending the same solution for every project, we take the time to understand:

Your building type.
Roof construction.
Ceiling layout.
Energy-efficiency goals.
Budget.
Future renovation plans.
Acoustic requirements.
Long-term expectations.

Using this information, we recommend the Isotherm insulation thickness and installation approach that offers the best balance between performance, practicality and value.

Our advice is based on experience—not sales pressure.

Accurate Measurements and Material Calculations

Accurate measurements are essential for both pricing and installation.

Our experienced team carefully measures:

Total ceiling area.
Individual rooms.
Complex ceiling layouts.
Double-volume spaces.
Bulkheads.
Roof access limitations.

This allows us to prepare accurate quotations while ensuring the correct quantity of Isotherm insulation is ordered for the project.

Accurate planning reduces waste, prevents delays and contributes to a smoother installation process.

Genuine Isotherm Insulation Products

We install genuine Isotherm insulation products that have earned a strong reputation for thermal performance, sound absorption and long-term durability.

Isotherm offers:

Reliable thermal insulation.
Good acoustic performance.
Manufactured from recycled PET plastic bottles.
Thermally bonded polyester fibres.
Long service life.
Lightweight construction.
Suitable for residential, commercial and industrial buildings.

By combining quality insulation with professional installation, we help our customers achieve lasting comfort and improved energy efficiency.

Professional Workmanship

The quality of the installation has a direct impact on the long-term performance of your insulation.

Our installation teams focus on:

Accurate measuring.
Neat fitting.
Continuous insulation coverage.
Careful trimming around roof trusses.
Safe installation around building services.
Thorough quality inspections.
Clean, professional workmanship.

Attention to detail helps maximise the thermal and acoustic performance of your Isotherm insulation while extending its effective service life.

Residential, Commercial and Industrial Expertise

Our experience extends across projects of every size.

We regularly install Isotherm insulation for:

Homeowners.
Property developers.
Builders.
Architects.
Commercial property owners.
Industrial facilities.
Schools.
Healthcare providers.
Hotels.
Government departments.
Agricultural businesses.

Regardless of project size, our commitment to quality workmanship remains the same.

Competitive Installed Pricing

We believe customers deserve outstanding value rather than simply the lowest quotation.

Our quotations are designed to provide a balance between:

Premium insulation products.
Professional workmanship.
Reliable service.
Long-term performance.
Competitive installed pricing.

Our focus is on delivering installations that continue saving energy and improving comfort long after the work has been completed.

Reliable Project Scheduling

Whether you are building a new home or upgrading an existing property, completing the installation at the right stage of the project is essential.

We work closely with homeowners, builders and project managers to schedule installations efficiently while minimising delays and disruption.

Careful planning helps ensure every project progresses smoothly from start to finish.

5-Year Workmanship Warranty

We stand behind the quality of every Isotherm insulation installation we complete.

Every installation is backed by our 5-Year Workmanship Warranty, reflecting our confidence in the quality of our workmanship and our commitment to customer satisfaction.

This warranty provides valuable peace of mind, knowing your insulation has been installed by experienced professionals who take pride in delivering reliable, long-term results.

A Reputation Built on Trust

Over more than 36 years, Cape Ceilings & Drywalling has earned the trust of homeowners, builders and commercial clients by consistently delivering professional insulation installations and dependable service.

Customers continue to choose us because we provide:

Honest recommendations.
Experienced installation teams.
Accurate quotations.
Professional workmanship.
Genuine Isotherm insulation products.
Competitive installed pricing.
Reliable after-sales support.
Long-term value.

We believe that every project should leave the customer with a building that is more comfortable, more energy efficient and better prepared for the years ahead.

Request Your Free Isotherm Insulation Installation Quote

Whether you are insulating a new home, upgrading an existing property or planning a commercial insulation project, Cape Ceilings & Drywalling is ready to assist.

Our experienced team will inspect your roof space, recommend the most suitable Isotherm insulation thickness and prepare a detailed, obligation-free quotation tailored to your project.

With more than 36 years of insulation experience, genuine Isotherm products, skilled installation teams and our 5-Year Workmanship Warranty, you can invest with confidence.

Contact Cape Ceilings & Drywalling today to request your free quotation and discover how professionally installed Isotherm insulation can improve comfort, reduce energy costs and provide lasting value for your home or business.

Frequently Asked Questions About Isotherm Insulation Installation

How much does Isotherm insulation installation cost?

The cost of Isotherm insulation installation depends on several factors, including the size of your ceiling area, the insulation thickness you choose, the accessibility of the roof space and whether the property is a new build or an existing home. Larger homes, double-storey properties and commercial buildings may require additional labour due to more complex roof structures. At Cape Ceilings & Drywalling, we prepare detailed quotations based on accurate measurements and roof inspections rather than estimates, ensuring transparent installed pricing with no hidden surprises. Contact us for a free, obligation-free quotation tailored to your project.

Which Isotherm insulation thickness should I choose?

The most suitable Isotherm thickness depends on your building, available roof space, budget and energy-efficiency goals.

145mm Isotherm provides the highest thermal performance in the Isotherm range.
135mm Isotherm offers excellent all-round performance for most residential and commercial buildings.
100mm Isotherm provides an excellent balance between cost and thermal efficiency.
75mm Isotherm is suitable where moderate insulation levels are appropriate. A
50mm Isotherm is commonly selected where roof space is limited or for applications requiring moderate insulation.

Following our roof inspection, we recommend the thickness that best suits your property’s specific requirements.

Is the 145mm Isotherm worth the additional investment?

For many homeowners, yes. The additional thickness provides improved resistance to heat transfer, helping keep homes cooler during summer and warmer throughout winter. Customers planning to remain in their homes for many years often find that the improved comfort and reduced heating and cooling costs justify the higher initial investment.

Can Isotherm insulation be installed in an existing home?

Yes. Most of our Isotherm installations are completed in existing homes. We usually install the insulation through the roof access hatch without removing the ceiling. Before installation begins, we inspect the roof cavity, electrical wiring, existing insulation and roof structure to ensure the work can be completed safely and efficiently.

Can Isotherm insulation be installed over existing insulation?

In some situations, yes. If the existing insulation remains in good condition and has been installed correctly, it may be possible to install additional insulation. However, if the existing insulation has been damaged by roof leaks, compressed over time, disturbed during maintenance work or no longer performs effectively, replacement may provide better long-term results. Every roof is assessed individually before we make a recommendation.

How long does Isotherm insulation installation take?

The installation timeframe depends on the size of the property, roof complexity and accessibility within the roof space. Most average-sized residential homes can often be completed within a single day, while larger commercial and industrial projects may require additional time. Before work begins, we provide an estimated installation schedule so you know exactly what to expect.

Will Isotherm insulation reduce my electricity bill?

Professionally installed Isotherm insulation helps reduce heat entering your home during summer and slows heat loss during winter. This allows heating and cooling systems to operate more efficiently, often reducing electricity consumption over time. While actual savings vary depending on the building and occupancy patterns, ceiling insulation remains one of the most effective long-term energy-efficiency improvements available.

Does Isotherm insulation reduce noise?

Yes. Isotherm insulation provides good acoustic performance by helping absorb sound travelling through the ceiling space. Many homeowners notice reduced external noise and a quieter indoor environment after installation. This makes Isotherm a popular choice for homes, offices, schools, hotels and other buildings where improved acoustic comfort is important.

Is Isotherm insulation safe for homes with children and pets?

Yes. Once professionally installed above the ceiling, Isotherm insulation remains inside the roof space and does not interfere with the normal use of your home. Manufactured from thermally bonded polyester fibres using recycled PET plastic bottles, it is widely used in residential and commercial buildings throughout South Africa. Professional installation ensures the insulation is fitted correctly and performs reliably for many years.

How long does Isotherm insulation last?

When professionally installed and protected from roof leaks or unnecessary disturbance, Isotherm insulation is designed to provide reliable thermal and acoustic performance for many decades. Periodic roof inspections and prompt repair of any leaks will help preserve its long-term effectiveness, making it a valuable investment in your property’s comfort and energy efficiency.

Excellent. These next 10 FAQs deal with the practical questions that customers often ask before requesting a quotation. They also broaden the page’s topical coverage and capture additional long-tail search traffic.

Can Isotherm insulation get wet?

Isotherm insulation is designed to perform inside a dry, weatherproof roof space. If a roof leak develops, it should be repaired as soon as possible to prevent ongoing moisture exposure. During our roof inspections, we carefully check for signs of water damage before installing new insulation. Maintaining a leak-free roof is one of the best ways to protect both your insulation and your home. If existing insulation has been significantly affected by water damage, we will advise whether replacement is the most suitable long-term solution.

Does Isotherm insulation help reduce condensation?

Professionally installed Isotherm insulation helps maintain more stable indoor temperatures, which can contribute to reducing the conditions that encourage condensation. However, condensation is influenced by several factors, including humidity levels, ventilation and overall building design. For the best results, ceiling insulation should work together with good roof ventilation. During our roof inspection, we assess the existing ventilation and can recommend practical improvements where appropriate.

What is the fire classification of Isotherm insulation?

Isotherm insulation carries a B/B 1/2 fire classification and is suitable for use in a wide range of residential, commercial and industrial buildings when installed in accordance with the manufacturer’s recommendations and applicable building requirements. As part of every installation, we inspect the roof space for visible safety concerns and recommend that damaged electrical wiring or other issues be addressed before insulation is installed. Good workmanship and proper installation are important parts of overall building safety.

Can I install Isotherm insulation myself?

Although some homeowners choose to install insulation themselves, professional installation offers significant advantages. Roof spaces often contain electrical wiring, plumbing pipes, air-conditioning ducting and restricted access areas that require careful planning. Correctly fitting the insulation around these obstacles while maintaining continuous coverage takes experience. Professional installation also helps minimise thermal gaps, preserve the insulation’s full thickness and maximise long-term performance.

Do you remove old insulation before installing Isotherm?

Yes, where necessary. During our roof inspection, we assess the condition of any existing insulation. If it has been damaged by water, compressed over time, disturbed by previous maintenance work or no longer provides effective thermal performance, we may recommend replacing it. If the existing insulation remains in good condition, we will advise whether it can remain in place. Every recommendation is based on the specific condition of your roof space.

Can Isotherm insulation be installed during winter?

Absolutely. Winter is one of the best times to install ceiling insulation because homeowners often experience the benefits immediately. Once installed, Isotherm helps retain indoor warmth, making living areas more comfortable while reducing reliance on heaters. We install insulation throughout the year, although severe weather conditions may occasionally influence scheduling. If the weather is likely to affect your installation date, we will keep you informed throughout the process.

Will Isotherm insulation increase the value of my property?

Professionally installed ceiling insulation is considered a valuable feature by many prospective buyers because it improves comfort and reduces long-term energy costs. While insulation is only one factor influencing property value, an energy-efficient home with improved thermal performance is often more attractive to buyers and tenants. Ceiling insulation is a long-term investment that continues providing benefits for many years.

Do you install Isotherm insulation in commercial and industrial buildings?

Yes. Cape Ceilings & Drywalling has extensive experience installing Isotherm insulation in commercial offices, schools, hospitals, warehouses, factories, shopping centres, hotels, agricultural buildings and many other types of commercial and industrial properties. Whether the project involves a small office or a large manufacturing facility, we apply the same professional installation methods and workmanship standards to every project.

Do you provide free quotations for Isotherm insulation installation?

Yes. We provide detailed, obligation-free quotations based on the specific requirements of your project. Wherever practical, we inspect the roof space, measure the ceiling area and recommend the most suitable Isotherm insulation thickness before preparing your quotation. This ensures accurate material calculations, transparent pricing and a solution tailored to your property’s needs and budget.

Why should I choose Cape Ceilings & Drywalling for my Isotherm insulation installation?

With more than 36 years of insulation installation experience, Cape Ceilings & Drywalling has built a reputation for quality workmanship, honest advice and dependable service. We specialise in residential, commercial and industrial insulation projects and install genuine Isotherm insulation products using experienced installation teams. Our customers benefit from accurate quotations, detailed roof inspections, professional workmanship, competitive installed pricing and the peace of mind provided by our 5-Year Workmanship Warranty. Our objective is to deliver insulation solutions that improve comfort, reduce energy costs and provide lasting value for every customer.

Perfect. Let’s finish this page properly. These are the final FAQs before the conclusion, and they answer the last questions that often stop customers from making contact.

How soon can you install my Isotherm insulation?

Installation times depend on our current schedule, the size of your project and whether the insulation is being installed in a new building or an existing property. Smaller residential homes can often be scheduled relatively quickly, while larger commercial and industrial projects may require additional planning. Once your quotation has been accepted, we will confirm a convenient installation date and ensure all materials are available before work begins. Our goal is always to complete every project efficiently while maintaining the highest standards of workmanship.

What preparation is required before installation?

Very little preparation is required from the homeowner. We recommend ensuring that the ceiling access hatch is easily accessible and that any valuable furniture or belongings directly beneath the access point are moved before our team arrives. If the roof space is being used for storage, removing stored items beforehand allows us to work more safely and efficiently. Following our roof inspection, we will advise you if any additional preparation is required before installation.

Will the installation create a mess?

Our installation teams take great pride in keeping your home or business clean throughout the project. Most of the work takes place inside the roof cavity, meaning disruption inside the building is generally minimal. Once the installation has been completed, we remove insulation offcuts, packaging materials and any waste generated during the project. Before leaving the site, we carry out a final inspection to ensure the work area has been left clean, tidy and ready for normal use.

Can you install Isotherm insulation in double-storey homes?

Yes. We regularly install Isotherm insulation in double-storey homes, architect-designed residences, townhouses and luxury properties throughout Cape Town and the Western Cape. These homes often have more complex roof structures, but our experienced installation teams carefully assess each roof layout before work begins. Through careful planning and professional workmanship, we achieve excellent insulation coverage regardless of the complexity of the roof.

Do I need to leave my home during the installation?

In most cases, no. Because the insulation is installed from within the roof space, homeowners can usually remain in the property while the work is being carried out. You may hear our installers moving above the ceiling, but disruption inside the home is generally minimal. If a particular project requires special access arrangements or additional safety precautions, we will discuss these with you before work begins.

Does Isotherm insulation attract rodents or insects?

No. Isotherm insulation is manufactured from thermally bonded polyester fibres and does not provide a food source for rodents or insects. However, if pests already have access to the roof space through damaged roof coverings or unsealed openings, they may still enter the roof cavity. We recommend maintaining your roof in good condition and sealing potential entry points to minimise the risk of pest activity. Regular roof inspections also help identify any issues before they become more serious.

Can electricians or solar installers disturb the insulation after it has been installed?

Yes, they can. Future work inside the roof space, such as electrical upgrades, solar installations, plumbing repairs or air-conditioning maintenance, may require sections of insulation to be moved. If the insulation is not repositioned correctly afterwards, gaps may develop that reduce its thermal performance. We recommend ensuring the insulation is returned to its original position after any roof work has been completed. If extensive work has been carried out, we are happy to inspect the insulation and make any necessary adjustments.

Does Isotherm insulation require maintenance?

Isotherm insulation requires very little maintenance once it has been professionally installed. We recommend occasional roof inspections to check for roof leaks, disturbed insulation, rodent activity or any damage caused during maintenance work. Provided the roof remains weatherproof and the insulation is left undisturbed, it should continue delivering reliable thermal and acoustic performance for many decades.

Which areas do you cover for Isotherm insulation installation?

Cape Ceilings & Drywalling provides professional Isotherm insulation installation throughout Cape Town and the surrounding areas of the Western Cape. We work in residential suburbs, commercial developments, industrial areas, schools, hospitals, warehouses, agricultural properties and many other types of buildings. If you are unsure whether we service your location, simply contact us, and we will gladly discuss your project and confirm availability.

How do I request an Isotherm insulation installation quotation?

Requesting a quotation is simple. Contact Cape Ceilings & Drywalling by phone, email or through the enquiry form on our website. Our experienced team will discuss your project, arrange a roof inspection where required, measure the ceiling area, recommend the most suitable Isotherm insulation thickness and prepare a detailed, obligation-free quotation. We are always happy to answer your questions and help you choose the insulation solution that best suits your property and long-term energy-saving goals.

Conclusion – Invest in Lasting Comfort with Professional Isotherm Insulation Installation

Choosing the right ceiling insulation is an investment in the long-term comfort, energy efficiency and value of your property. Manufactured from thermally bonded polyester fibres using recycled PET plastic bottles, Isotherm insulation provides reliable thermal performance, effective sound absorption and dependable durability for residential, commercial and industrial buildings.

At Cape Ceilings & Drywalling, we combine more than 36 years of insulation installation experience with genuine Isotherm insulation products, skilled installation teams and an unwavering commitment to quality workmanship. Every project is carefully planned, accurately measured and professionally installed to ensure your insulation performs exactly as intended.

When you choose Cape Ceilings & Drywalling, you benefit from:

More than 36 years of professional insulation experience.
Specialist residential, commercial and industrial installation.
Genuine Isotherm insulation products.
Accurate measurements and material calculations.
Honest, practical advice.
Competitive installed pricing.
Experienced installation teams.
A comprehensive 5-Year Workmanship Warranty.
Reliable after-sales support.

Our objective is simple—to help you enjoy a cooler home during summer, a warmer home throughout winter and lower energy costs for many years to come.

Whether you are insulating a new home, upgrading an older property or improving the energy efficiency of a commercial building, our experienced team is ready to assist.

Contact Cape Ceilings & Drywalling today for your free, no-obligation Isotherm insulation installation quotation and discover how professionally installed Isotherm insulation can transform the comfort and efficiency of your property.