140mm Celotex XR4140 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board
140mm Celotex XR4140 is a rigid polyisocyanurate (PIR) insulation board and the first thickness in the XR4000 range to carry a single-layer R-value above 6.0. That places it with the new-build and low-energy projects where floor and roof targets run tighter than the 110mm to 130mm boards will meet in one pass, and where the deeper structural zones have the room to take it.
Each board measures 2400mm x 1200mm, covers 2.88m² and is sold individually. A declared thermal conductivity of 0.022 W/mK gives it a thermal resistance of 6.35 m²K/W, the first XR4000 figure past the 6.0 mark, at a maximum board weight of around 5.71 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that lifts performance against a sealed cavity air space, and the square edges close up for a continuous, tight-jointed layer.
At 140mm the board lines up with deeper joist and rafter zones and thicker floor build-ups, so the structure that already needs the depth can take a single 6.35 m²K/W layer rather than a doubled one: fewer boards to cut and tape, and one continuous plane of insulation across the bay.
XR4140 is specified as a single cut-to-fit layer in solid and suspended floors, in warm flat and pitched roofs between or under joists and rafters, and across masonry walls and timber- and steel-framed systems, typically on new build and high-specification refurbishment. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including fire requirements and the height limit on external wall use. In wall build-ups it should be covered with a fire-rated lining such as 12.5mm plasterboard. Where the target sits at the demanding end and the build-up has the depth, the 140mm board delivers it in one layer.
Key Benefits of 140mm Celotex XR4140:
- 140mm rigid polyisocyanurate (PIR) board, the first XR4000 thickness to carry a single-layer R-value above 6.0, for demanding floor and roof targets.
- Thermal resistance (R-value) of 6.35 m²K/W, suited to new-build and low-energy specifications.
- Declared thermal conductivity of 0.022 W/mK, delivering that resistance in a 140mm depth.
- Matches deeper joist and rafter zones and thicker floor build-ups, taking the target in a single layer.
- Used across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.
- 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 a maximum board weight of around 5.71 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.
- On a solid floor below screed, separate the foil facing from the screed with a damp-proof membrane: wet cement screed can react with bare aluminium foil.
- The foil facing is not a vapour control layer; many floor and roof build-ups still need a separate VCL to manage interstitial condensation.
- In wall applications the board should be covered with a fire-rated lining, such as 12.5mm plasterboard.
- Celotex XR4000 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.
For new builds and high-spec refurbishments setting a tighter floor or roof figure, 140mm Celotex XR4140 carries a single-layer R-value past 6.0, meeting the target in one continuous board where the build-up already has the depth to take it.
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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140mm Celotex XR4140 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board
140mm Celotex XR4140 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board
140mm Celotex XR4140 is a rigid polyisocyanurate (PIR) insulation board and the first thickness in the XR4000 range to carry a single-layer R-value above 6.0. That places it with the new-build and low-energy projects where floor and roof targets run tighter than the 110mm to 130mm boards will meet in one pass, and where the deeper structural zones have the room to take it.
Each board measures 2400mm x 1200mm, covers 2.88m² and is sold individually. A declared thermal conductivity of 0.022 W/mK gives it a thermal resistance of 6.35 m²K/W, the first XR4000 figure past the 6.0 mark, at a maximum board weight of around 5.71 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that lifts performance against a sealed cavity air space, and the square edges close up for a continuous, tight-jointed layer.
At 140mm the board lines up with deeper joist and rafter zones and thicker floor build-ups, so the structure that already needs the depth can take a single 6.35 m²K/W layer rather than a doubled one: fewer boards to cut and tape, and one continuous plane of insulation across the bay.
XR4140 is specified as a single cut-to-fit layer in solid and suspended floors, in warm flat and pitched roofs between or under joists and rafters, and across masonry walls and timber- and steel-framed systems, typically on new build and high-specification refurbishment. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including fire requirements and the height limit on external wall use. In wall build-ups it should be covered with a fire-rated lining such as 12.5mm plasterboard. Where the target sits at the demanding end and the build-up has the depth, the 140mm board delivers it in one layer.
Key Benefits of 140mm Celotex XR4140:
- 140mm rigid polyisocyanurate (PIR) board, the first XR4000 thickness to carry a single-layer R-value above 6.0, for demanding floor and roof targets.
- Thermal resistance (R-value) of 6.35 m²K/W, suited to new-build and low-energy specifications.
- Declared thermal conductivity of 0.022 W/mK, delivering that resistance in a 140mm depth.
- Matches deeper joist and rafter zones and thicker floor build-ups, taking the target in a single layer.
- Used across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.
- 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 a maximum board weight of around 5.71 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.
- On a solid floor below screed, separate the foil facing from the screed with a damp-proof membrane: wet cement screed can react with bare aluminium foil.
- The foil facing is not a vapour control layer; many floor and roof build-ups still need a separate VCL to manage interstitial condensation.
- In wall applications the board should be covered with a fire-rated lining, such as 12.5mm plasterboard.
- Celotex XR4000 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.
For new builds and high-spec refurbishments setting a tighter floor or roof figure, 140mm Celotex XR4140 carries a single-layer R-value past 6.0, meeting the target in one continuous board where the build-up already has the depth to take it.
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
140mm Celotex XR4140 is a rigid polyisocyanurate (PIR) insulation board and the first thickness in the XR4000 range to carry a single-layer R-value above 6.0. That places it with the new-build and low-energy projects where floor and roof targets run tighter than the 110mm to 130mm boards will meet in one pass, and where the deeper structural zones have the room to take it.
Each board measures 2400mm x 1200mm, covers 2.88m² and is sold individually. A declared thermal conductivity of 0.022 W/mK gives it a thermal resistance of 6.35 m²K/W, the first XR4000 figure past the 6.0 mark, at a maximum board weight of around 5.71 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that lifts performance against a sealed cavity air space, and the square edges close up for a continuous, tight-jointed layer.
At 140mm the board lines up with deeper joist and rafter zones and thicker floor build-ups, so the structure that already needs the depth can take a single 6.35 m²K/W layer rather than a doubled one: fewer boards to cut and tape, and one continuous plane of insulation across the bay.
XR4140 is specified as a single cut-to-fit layer in solid and suspended floors, in warm flat and pitched roofs between or under joists and rafters, and across masonry walls and timber- and steel-framed systems, typically on new build and high-specification refurbishment. Install it in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including fire requirements and the height limit on external wall use. In wall build-ups it should be covered with a fire-rated lining such as 12.5mm plasterboard. Where the target sits at the demanding end and the build-up has the depth, the 140mm board delivers it in one layer.
Key Benefits of 140mm Celotex XR4140:
- 140mm rigid polyisocyanurate (PIR) board, the first XR4000 thickness to carry a single-layer R-value above 6.0, for demanding floor and roof targets.
- Thermal resistance (R-value) of 6.35 m²K/W, suited to new-build and low-energy specifications.
- Declared thermal conductivity of 0.022 W/mK, delivering that resistance in a 140mm depth.
- Matches deeper joist and rafter zones and thicker floor build-ups, taking the target in a single layer.
- Used across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.
- 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 a maximum board weight of around 5.71 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.
- On a solid floor below screed, separate the foil facing from the screed with a damp-proof membrane: wet cement screed can react with bare aluminium foil.
- The foil facing is not a vapour control layer; many floor and roof build-ups still need a separate VCL to manage interstitial condensation.
- In wall applications the board should be covered with a fire-rated lining, such as 12.5mm plasterboard.
- Celotex XR4000 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.
For new builds and high-spec refurbishments setting a tighter floor or roof figure, 140mm Celotex XR4140 carries a single-layer R-value past 6.0, meeting the target in one continuous board where the build-up already has the depth to take it.
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.
