150mm Knauf Insulation Premium Original price was: R1 492,33.R1 122,65Current price is: R1 122,65.
150mm Knauf Insulation Premium
Original price was: R1 492,33.R1 122,65Current price is: R1 122,65.
Experience superior comfort and efficiency with our flagship 150mm Knauf Insulation — the highest-performing Knauf product we offer. With an outstanding R-value of 3.76, with the installed R-value 4.16, keeping your home dramatically cooler in summer and warmer in winter.
Enjoy exceptional sound absorption for a quieter, more peaceful living environment while significantly reducing energy costs. Built for Western Cape conditions, it provides reliable passive temperature stability during load shedding.
Manufactured with premium Knauf glass mineral wool and advanced ECOSE® Technology, this non-combustible insulation offers long-lasting durability, sustainability, and trusted performance. The ultimate choice for homeowners who want maximum comfort and efficiency from their ceiling insulation.
150mm Knauf Dual-Layer Insulation: The Ultimate Knauf Product for South African Homes
When it comes to roof and ceiling insulation, not all products are created equal. Our new 150mm Knauf Dual-Layer Insulation Roll stands in a league of its own. Manufactured as two high-performance 75mm Knauf layers combined into one versatile roll, it gives you an unmatched 150mm of premium glass mineral wool when installed at full thickness — or the flexibility to separate the layers and use them as two standard 75mm rolls.
This is not just another insulation product. This is our most important Knauf offering because it delivers double the thermal resistance, superior acoustic control, and genuine installation versatility that no single-thickness roll can match. For Western Cape homeowners facing scorching summer days, chilly winter nights, and the ongoing reality of load shedding, it represents the smartest upgrade you can make to your home’s comfort and efficiency.
Why 150mm Knauf Insulation Double the Thickness Changes Everything
R-value measures how effectively a material resists heat flow. The higher the R-value, the better the insulation. A standard 75mm Knauf layer delivers an excellent R-value of 1.88 m²K/W. By installing the dual-layer roll at the full 150mm thickness, you achieve 3.76 m²K/W with an installed R-value of 4.16 m²K/W — literally double the thermal resistance.
This means dramatically less heat enters your home in summer and far less escapes in winter. In practical terms, you can expect significantly reduced temperature swings, lower reliance on fans, air conditioners, or heaters, and meaningful long-term savings on electricity. During load shedding, the difference is tangible: your home maintains comfortable temperatures for longer without any power input.
The acoustic benefits are equally impressive. The 75mm layer already achieves an NRC (Noise Reduction Coefficient) of 0.93 — excellent sound absorption. At 150mm double-layer thickness, the effective NRC rises substantially higher (typically exceeding 1.05 across key frequencies), delivering superior broadband noise reduction. Rain on the roof, traffic, or noise from other rooms becomes noticeably quieter. Your home feels calmer and more peaceful.
The Revolutionary Versatility of the Dual-Layer Roll
Here is what makes this product truly special: the roll is manufactured with two 75mm layers. You can leave it intact for premium 150mm performance in key areas (master bedrooms, living rooms, or the entire ceiling), or easily open/separate the layers to create two independent 75mm rolls.
This gives you unprecedented flexibility:
- One purchase covers maximum performance where you need it most.
- Or split it for broader coverage across the whole house at standard thickness.
- No need to buy and stock two different products.
- Perfect for mixed projects or phased installations.
It is the ultimate “future-proof” insulation choice.
150mm Knauf Insulation Built for Western Cape Conditions & Load Shedding Resilience
The Western Cape climate demands intelligent insulation. Large diurnal temperature swings, intense summer sun, and occasional cold winter fronts make high-performance ceiling insulation essential. Our 150mm Knauf Dual-Layer excels here:
- Hot summers: Reflects and resists solar heat gain, keeping upper floors and living spaces cooler.
- Cold winters: Retains indoor warmth far more effectively than thinner insulation.
- Load shedding: Provides passive thermal mass and resistance, so homes stay comfortable longer without mechanical heating or cooling.
- Year-round comfort: Reduces condensation risk and helps maintain stable indoor humidity when paired with proper ventilation.
It also contributes to SANS 10400-XA energy efficiency compliance and improves your home’s overall energy rating.
150mm Knauf Insulation Detailed Technical Specifications
150mm Knauf Insulation – Performance Grid
| Property | 75mm Single Layer | 150mm Dual Layer | Benefit |
|---|---|---|---|
| Thickness | 75 mm | 150 mm (2 × 75 mm layers) | Double performance or split for flexibility |
| R-Value | 1.88 m²K/W | 3.76 m²K/W | Double thermal resistance – dramatically lower heat transfer |
| NRC (Noise Reduction Coefficient) | 0.93 | Significantly higher (~1.05+) | Superior sound absorption, quieter home |
| Thermal Conductivity (λ) | 0.040 W/mK | 0.040 W/mK | Consistent high-performance glass mineral wool |
| Density | 12 kg/m³ | 12 kg/m³ | Optimal balance of acoustic & thermal performance |
| Weight per m² | 0.90 kg/m² | 1.80 kg/m² | Lightweight yet highly effective |
| Fire Rating | Euroclass A1 | Euroclass A1 | Non-combustible – highest safety standard |
| Material | Glass Mineral Wool + ECOSE® Technology | Same | Sustainable, low-dust, formaldehyde-free |
| Roll Width | 1,200 mm (splits to 2×600 mm) | Same (dual-layer configuration) | Perfect friction fit for standard joists/studs |
| Typical Coverage (per roll/pack) | ~15.36 m² | 8.8 m² at 150mm (or double when split) | Excellent value; contact us for current stock lengths |
| Water Vapour Resistivity | 5.0 MNs/g.m | 5.0 MNs/g.m | Breathable, helps manage moisture |
| Durability & Settlement | Excellent | Excellent | Maintains performance for decades |
All values are based on Knauf’s proven glass mineral wool technology with ECOSE® bio-based binder (up to 80% recycled glass content in many formulations). Non-hygroscopic, rot-proof, and does not support mould, fungi, or vermin.
Why This Is the Best Knauf Insulation We Offer
- Highest thermal performance in our Knauf range (R 3.76 beats standard 75mm, 100mm, and even many 135mm options when installed at full thickness).
- Best acoustic control — higher NRC than single-layer equivalents.
- Unmatched versatility — one product, two thicknesses.
- Premium Knauf quality — trusted worldwide, now optimised for South African conditions.
- Professional installation advantage — our permanent skilled teams install it perfectly every time with our 5-year workmanship guarantee.
Easy Professional Installation
The rolls are lightweight, easy to cut with a sharp knife, and friction-fit perfectly between ceiling joists or timber/metal studs at 400mm or 600mm centres. Ideal for:
- Ceiling insulation (loft/ceiling void)
- Suspended ceiling systems
- Internal walls and partitions (for combined thermal + acoustic benefit)
Our experienced installation teams ensure zero gaps, proper compression where needed, and full coverage for maximum performance. We also supply and install complementary products (Sisalation, vapour barriers, etc.) for complete systems.
10+ Frequently Asked Questions
1. What makes the 150mm Knauf Dual-Layer different from regular Knauf rolls?
It is manufactured as two 75mm layers in one roll. Install at full 150mm for R-value 3.76 and higher NRC, or separate the layers for standard 75mm use. This versatility is unique.
2. Can I really split the roll into two 75mm layers?
Yes. The layers are designed to be easily separated on-site, giving you two independent high-quality 75mm rolls from one purchase.
3. Why is an R-value of 3.76 so important?
It provides double the thermal resistance of 75mm Knauf. Your home loses or gains far less heat, staying comfortable longer and using less energy for heating/cooling.
4. Is this suitable for Western Cape homes?
Absolutely. It is ideal for our climate — hot summers, cold winters, and load shedding resilience through passive temperature stability.
5. How good is the acoustic performance?
Excellent. Single-layer NRC 0.93; at 150mm, the effective NRC is significantly higher, absorbing more sound across a wider frequency range for a quieter home.
6. Will it help during load shedding?
Yes. Better insulation means your home maintains comfortable temperatures longer without power for heaters or air conditioners.
7. Is Knauf insulation environmentally friendly?
Yes. It uses ECOSE® Technology (bio-based binder, no added formaldehyde), high recycled glass content, and is produced sustainably. It is also long-lasting and recyclable at end of life.
8. Can it be used in walls as well as ceilings?
Yes. It performs brilliantly in ceilings/lofts and internal walls/partitions where you want both thermal and acoustic benefits.
9. What are the roll dimensions and coverage?
1200mm wide (splits to 2×600mm). Lengths vary by batch but typically provide strong coverage. One dual-layer unit covers a meaningful area at 150mm — or double that area when split. Contact us for the current exact figures.
10. How does it compare to Isotherm, Aerolite or other brands?
Knauf glass mineral wool offers superior acoustic performance and fire rating (A1) alongside excellent thermal values. The dual-layer versatility and R 3.76 at 150mm make it our premium flagship choice.
11. What warranties and guarantees apply?
Knauf provides manufacturer performance assurance. Our professional installation teams back every job with a 5-year workmanship guarantee.
12. Is it safe and non-combustible?
Yes — Euroclass A1 fire rating. It will not burn or contribute to fire spread.
13. Can I buy it online, or do you only do installations? Both.
We offer supply-only and full professional supply-and-install packages across the Western Cape (Cape Town, Saldanha, Vredenburg, Langebaan and surrounding areas).