90mm Celotex GA4090 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet
Sitting just below the range-topping 100mm board, 90mm Celotex GA4090 is a rigid polyisocyanurate (PIR) insulation board from the high-performance end of the general-purpose GA4000 range. It is built for floors, walls and roofs, and is chosen where a single layer must carry strong thermal resistance, especially in floor build-ups and pitched roofs working towards lower U-value targets.
Each board measures 2400mm x 1200mm x 90mm, covers 2.88m² and is sold individually. With a declared thermal conductivity of 0.022 W/mK and a thermal resistance of 4.05 m²K/W, it offers the second-highest single-board figure in the GA4000 range, at a still-workable weight of around 3.31 kg per square metre.
Because it carries a high R-value in one board, 90mm GA4090 works as a strong single layer or pairs cleanly in two-layer build-ups, for example between rafters with a second board running underneath to break the line of the timber. Both faces are finished with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges butt together so the insulation layer stays continuous and the joints stay tight.
On site, 90mm GA4090 is used in floor build-ups aiming at lower U-values, in pitched roofs both as a single layer and as part of a two-layer detail between and under rafters, and in timber-framed walls and internal dry lining, with flat-roof build-ups also within the GA4000 range's scope. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. Across new build and refurbishment, the 90mm board gives a high single-layer R-value while keeping the standard GA4000 board format and handling.
Key Benefits of 90mm Celotex GA4090:
- 90mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.
- Thermal resistance (R-value) of 4.05 m²K/W, the second-highest single-board figure in the GA4000 range.
- Declared thermal conductivity of 0.022 W/mK, holding the build-up depth down at a higher level of performance.
- A high-performance thickness for floors and pitched roofs working towards lower U-values.
- Suits both single-layer use and two-layer roof build-ups between and under rafters.
- Low-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.
- Square edges for flush, tight joints and a continuous insulation layer.
- Manufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.
- Supplied as a single 2400mm x 1200mm board covering 2.88m², at around 3.31 kg per square metre.
- BBA certified (Certificate 25/7318) for defined pitched roof, dry lining and floor applications.
Good to know:
- Boards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².
- The foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.
- For two-layer roof build-ups, stagger the board joints between layers so they do not line up, keeping the insulation continuous.
- Celotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.
- PIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.
- Insulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.
- The U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.
At the high-performance end of the GA4000 range, 90mm Celotex GA4090 puts a strong single-layer R-value into floors and roofs while keeping the board easy to specify, handle and fit.
Important Notice: Please be aware that during periods of high demand, we reserve the right to provide alternative brands that meet the same specifications and quality standards as the products you originally ordered.
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Product Information
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90mm Celotex GA4090 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet
90mm Celotex GA4090 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet
Sitting just below the range-topping 100mm board, 90mm Celotex GA4090 is a rigid polyisocyanurate (PIR) insulation board from the high-performance end of the general-purpose GA4000 range. It is built for floors, walls and roofs, and is chosen where a single layer must carry strong thermal resistance, especially in floor build-ups and pitched roofs working towards lower U-value targets.
Each board measures 2400mm x 1200mm x 90mm, covers 2.88m² and is sold individually. With a declared thermal conductivity of 0.022 W/mK and a thermal resistance of 4.05 m²K/W, it offers the second-highest single-board figure in the GA4000 range, at a still-workable weight of around 3.31 kg per square metre.
Because it carries a high R-value in one board, 90mm GA4090 works as a strong single layer or pairs cleanly in two-layer build-ups, for example between rafters with a second board running underneath to break the line of the timber. Both faces are finished with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges butt together so the insulation layer stays continuous and the joints stay tight.
On site, 90mm GA4090 is used in floor build-ups aiming at lower U-values, in pitched roofs both as a single layer and as part of a two-layer detail between and under rafters, and in timber-framed walls and internal dry lining, with flat-roof build-ups also within the GA4000 range's scope. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. Across new build and refurbishment, the 90mm board gives a high single-layer R-value while keeping the standard GA4000 board format and handling.
Key Benefits of 90mm Celotex GA4090:
- 90mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.
- Thermal resistance (R-value) of 4.05 m²K/W, the second-highest single-board figure in the GA4000 range.
- Declared thermal conductivity of 0.022 W/mK, holding the build-up depth down at a higher level of performance.
- A high-performance thickness for floors and pitched roofs working towards lower U-values.
- Suits both single-layer use and two-layer roof build-ups between and under rafters.
- Low-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.
- Square edges for flush, tight joints and a continuous insulation layer.
- Manufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.
- Supplied as a single 2400mm x 1200mm board covering 2.88m², at around 3.31 kg per square metre.
- BBA certified (Certificate 25/7318) for defined pitched roof, dry lining and floor applications.
Good to know:
- Boards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².
- The foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.
- For two-layer roof build-ups, stagger the board joints between layers so they do not line up, keeping the insulation continuous.
- Celotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.
- PIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.
- Insulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.
- The U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.
At the high-performance end of the GA4000 range, 90mm Celotex GA4090 puts a strong single-layer R-value into floors and roofs while keeping the board easy to specify, handle and fit.
Important Notice: Please be aware that during periods of high demand, we reserve the right to provide alternative brands that meet the same specifications and quality standards as the products you originally ordered.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Sitting just below the range-topping 100mm board, 90mm Celotex GA4090 is a rigid polyisocyanurate (PIR) insulation board from the high-performance end of the general-purpose GA4000 range. It is built for floors, walls and roofs, and is chosen where a single layer must carry strong thermal resistance, especially in floor build-ups and pitched roofs working towards lower U-value targets.
Each board measures 2400mm x 1200mm x 90mm, covers 2.88m² and is sold individually. With a declared thermal conductivity of 0.022 W/mK and a thermal resistance of 4.05 m²K/W, it offers the second-highest single-board figure in the GA4000 range, at a still-workable weight of around 3.31 kg per square metre.
Because it carries a high R-value in one board, 90mm GA4090 works as a strong single layer or pairs cleanly in two-layer build-ups, for example between rafters with a second board running underneath to break the line of the timber. Both faces are finished with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges butt together so the insulation layer stays continuous and the joints stay tight.
On site, 90mm GA4090 is used in floor build-ups aiming at lower U-values, in pitched roofs both as a single layer and as part of a two-layer detail between and under rafters, and in timber-framed walls and internal dry lining, with flat-roof build-ups also within the GA4000 range's scope. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. Across new build and refurbishment, the 90mm board gives a high single-layer R-value while keeping the standard GA4000 board format and handling.
Key Benefits of 90mm Celotex GA4090:
- 90mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.
- Thermal resistance (R-value) of 4.05 m²K/W, the second-highest single-board figure in the GA4000 range.
- Declared thermal conductivity of 0.022 W/mK, holding the build-up depth down at a higher level of performance.
- A high-performance thickness for floors and pitched roofs working towards lower U-values.
- Suits both single-layer use and two-layer roof build-ups between and under rafters.
- Low-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.
- Square edges for flush, tight joints and a continuous insulation layer.
- Manufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.
- Supplied as a single 2400mm x 1200mm board covering 2.88m², at around 3.31 kg per square metre.
- BBA certified (Certificate 25/7318) for defined pitched roof, dry lining and floor applications.
Good to know:
- Boards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².
- The foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.
- For two-layer roof build-ups, stagger the board joints between layers so they do not line up, keeping the insulation continuous.
- Celotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.
- PIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.
- Insulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.
- The U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.
At the high-performance end of the GA4000 range, 90mm Celotex GA4090 puts a strong single-layer R-value into floors and roofs while keeping the board easy to specify, handle and fit.
Important Notice: Please be aware that during periods of high demand, we reserve the right to provide alternative brands that meet the same specifications and quality standards as the products you originally ordered.
