{"title":"Celotex GA4000","description":"","products":[{"product_id":"50mm-celotex-ga4050-pir-insulation-board-2400mm-x-1200mm-x-50mm","title":"50mm Celotex GA4050 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e50mm Celotex GA4050 PIR Insulation Board is a rigid polyisocyanurate (PIR) insulation board from the general-purpose GA4000 range, designed for use across floors, walls and roofs. It is the thinnest board in the GA4000 line-up, which makes it a practical choice where insulation is needed in a slimmer profile, either as a single layer or as part of a multi-layer build-up.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach board measures 2400mm x 1200mm x 50mm and is supplied as a single board covering 2.88m² (sold per board). With a declared thermal conductivity of 0.022 W\/mK and a thermal resistance of 2.25 m²K\/W, the GA4050 delivers reliable thermal performance for its thickness, helping a project work towards its target U-values while keeping the insulation layer compact.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe board is faced on both sides with a low-emissivity aluminium foil, bonded to the closed-cell PIR core during manufacture. When installed facing a sealed or cavity air space, this reflective facing improves the thermal performance the build-up can achieve. The square edge profile keeps boards sitting cleanly side by side, so they cut, fit and butt together neatly across floors, walls and roofs.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAs a multi-application board, 50mm Celotex GA4050 is used in ground floors (including beam and block, concrete slab and suspended timber floors), internal dry lining, timber-framed walls and pitched roofs between or under rafters, with flat-roof applications also falling within the GA4000 range's scope. It should be installed in line with the latest Celotex technical guidance, the project specification and relevant Building Regulations, including any height restrictions on external wall use. Suitable for both new build and renovation, the 50mm GA4050 gives specifiers and trade installers one versatile board to carry across several parts of a project.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 50mm Celotex GA4050:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e50mm rigid polyisocyanurate (PIR) insulation board from the general-purpose GA4000 range, suitable for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK for strong thermal performance in a slim profile.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 2.25 m²K\/W for the 50mm board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides to improve performance across sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSquare edge profile for clean, close board-to-board fitting.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe thinnest board in the GA4000 range, useful where space is limited or as part of a multi-layer build-up.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLightweight and rigid, so boards are easy to transport, handle and cut on site.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWhere a project needs more than 50mm, the GA4050 can be combined with other thicknesses in a multi-layer build-up to reach a target U-value.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eStore boards flat, off the ground and protected from prolonged moisture before installation.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; always check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFor precise cuts and less on-site waste, Insulation UK offers a bespoke cutting service, so boards can be supplied cut to your specifications.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAchieved U-values depend on the full construction build-up, not the board alone: refer to the project specification before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAs the slimline starting point of the GA4000 range, 50mm Celotex GA4050 keeps specification simple, installation quick and thermal performance dependable across floors, walls and roofs.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655814771022,"sku":"BM000738","price":23.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4050-pir-insulation-board-2400mm-x-1200mm-x-50mm-50mm-bm000738-pir-insulation-1172606735.jpg?v=1749567975"},{"product_id":"60mm-celotex-ga4060-pir-insulation-board-2400mm-x-1200mm-x-60mm","title":"60mm Celotex GA4060 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e60mm Celotex GA4060 PIR Insulation Board is a rigid polyisocyanurate (PIR) insulation board from the general-purpose GA4000 range, sitting one step above the 50mm board in thermal performance. It is designed for use across walls, floors and roofs, and is a common choice where a 60mm board is specified, or where 50mm falls just short of the required thermal resistance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach board measures 2400mm x 1200mm x 60mm and is sold individually, covering 2.88m² per board. It carries a declared thermal conductivity of 0.022 W\/mK and a thermal resistance of 2.70 m²K\/W, a useful uplift over the 50mm board that still keeps the insulation layer slim while moving a build-up closer to its target U-value.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt the core of the board is a closed-cell PIR foam, faced on both sides with a low-emissivity aluminium foil. That foil does more than protect the core: where it faces a sealed or cavity air space, the reflective surface lifts the thermal performance the build-up can achieve. The straight, square edges let boards sit flush against one another, so joints stay tight and the insulation layer reads as continuous across walls, floors and roofs.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIn practice, 60mm GA4060 is specified in timber-framed walls, internal dry lining to masonry, suspended timber and concrete floors, and pitched roofs between or under rafters, with flat-roof build-ups also within the GA4000 range's scope. As with any PIR board, it should be fitted in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including the height restriction on external wall use. That versatility is the point: one board type carries across several elements of a project, on new build and refurbishment alike.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eKey Benefits of 60mm Celotex GA4060:\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e60mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for walls, floors and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 2.70 m²K\/W, a step up from the 50mm board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK for efficient performance in a slim board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, lifting performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eStraight, square edges for tight joints and a continuous insulation layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRigid yet light, so boards are simple to transport, handle and cut on site with standard tools.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eClosed-cell PIR core with good resistance to moisture pick-up.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eGood to know:\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity to achieve the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWhere a project needs more than 60mm, GA4060 can be combined with other thicknesses to build up to a target U-value.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: keep boards dry on site and store them flat, off the ground and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, so boards can be supplied cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe U-value of the finished element depends on the full build-up, not the board alone: confirm the target for your application before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA measured step up from the entry-level board, 60mm Celotex GA4060 adds useful thermal resistance without adding bulk, keeping specification simple and installation quick across walls, floors and roofs.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655814902094,"sku":"BM000740","price":28.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4060-pir-insulation-board-2400mm-x-1200mm-x-60mm-60mm-bm000740-pir-insulation-1172606731.jpg?v=1749567963"},{"product_id":"70mm-celotex-ga4070-pir-insulation-board-2400mm-x-1200mm-x-70mm","title":"70mm Celotex GA4070 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e70mm Celotex GA4070 PIR Insulation Board is a rigid polyisocyanurate (PIR) insulation board from the general-purpose GA4000 range, sitting in the middle of the range for thermal performance. It is a widely used mid-range thickness, specified across floors, walls and roofs where a single layer needs to deliver meaningful thermal resistance without taking up excessive depth.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eMeasuring 2400mm x 1200mm x 70mm and sold individually for 2.88m² of cover, the board pairs a declared thermal conductivity of 0.022 W\/mK with a thermal resistance of 3.15 m²K\/W. That places it a clear step above the 50mm and 60mm boards, giving a build-up more headroom against its target U-value while the board itself, at roughly 2.61 kg per square metre, stays straightforward to handle.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWhat makes 70mm a practical choice is the balance it strikes: enough closed-cell PIR to carry a useful R-value in one layer, faced both sides with a low-emissivity aluminium foil that lifts performance where it meets a sealed cavity air space. The straight, square edges butt cleanly together, which keeps the insulation layer continuous and helps limit the gaps that undermine thermal performance on site.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOn site, 70mm GA4070 is commonly laid in suspended timber and concrete floors, fitted in pitched roofs between or under rafters, and used in timber-framed walls and internal dry lining, with flat-roof build-ups also within the GA4000 range's scope. It should be installed to the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. Whether the job is a new build or a refurbishment, the 70mm board offers a dependable middle ground between slimness and single-layer performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 70mm Celotex GA4070:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e70mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 3.15 m²K\/W, a clear step up from the 50mm and 60mm boards.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, keeping the required thickness down for a given U-value.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA practical mid-range thickness that carries useful single-layer performance without excessive depth.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eStraight, square edges for clean, tight joints and a continuous insulation layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRigid and light at roughly 2.61 kg per square metre, simple to handle and cut with standard tools.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA single 70mm layer suits many floor and roof build-ups; for lower U-value targets it can be combined with another thickness.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA true middle-of-the-range all-rounder, 70mm Celotex GA4070 brings solid single-layer thermal resistance to floors, walls and roofs while staying simple to specify and quick to fit.\u003cbr\u003e\u003cbr\u003eImportant 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655815065934,"sku":"BM000742","price":32.44,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4070-pir-insulation-board-2400mm-x-1200mm-x-70mm-70mm-bm000742-pir-insulation-1172606727.jpg?v=1749567852"},{"product_id":"75mm-celotex-ga4075-pir-insulation-board-2400mm-x-1200mm-x-75mm","title":"75mm Celotex GA4075 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOne of the most frequently specified depths in the general-purpose GA4000 range, 75mm Celotex GA4075 is a rigid polyisocyanurate (PIR) insulation board for use across floors, walls and roofs. It appears regularly on floor and pitched-roof specifications where 75mm is the called-for thickness.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe board measures 2400mm x 1200mm x 75mm and is sold individually for 2.88m² of cover. It combines a declared thermal conductivity of 0.022 W\/mK with a thermal resistance of 3.40 m²K\/W, edging ahead of the 70mm board and giving floor and roof build-ups a healthy contribution towards their target U-value, all from a single board weighing around 2.78 kg per square metre.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBoth faces of the board carry a low-emissivity aluminium foil over a closed-cell PIR core. Against a sealed cavity air space that reflective facing improves the U-value the build-up can reach, so the board often earns its keep beyond the lambda figure alone. Square edges mean boards meet flush with no profile to line up, which speeds fitting and helps keep the insulation layer free of the gaps that let heat slip through.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e75mm GA4075 is widely used in pitched roofs, fitted between or under rafters in loft conversions and roof refurbishments, and laid in suspended timber and concrete floors, with timber-framed walls, internal dry lining and flat-roof build-ups also within the GA4000 range's scope. It should be installed in line with the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. Equally suited to new build and renovation, the 75mm board pairs a recognised, readily specified depth with dependable single-layer performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 75mm Celotex GA4075:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e75mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 3.40 m²K\/W, a step up from the 70mm board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, keeping the build-up depth down for a given U-value.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eOne of the most commonly specified GA4000 depths, well suited to floor and pitched-roof build-ups.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSquare edges for flush, gap-minimising joints across the insulation layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRigid and light at around 2.78 kg per square metre, easy to handle and cut with standard tools.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e75mm is a popular single-layer thickness for floors and roofs; for lower U-value targets it can be doubled up or combined with another board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA go-to specified thickness, 75mm Celotex GA4075 brings reliable single-layer performance to floors and roofs while keeping specification straightforward and installation quick.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655815197006,"sku":"BM000743","price":32.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4075-pir-insulation-board-2400mm-x-1200mm-x-75mm-75mm-bm000743-pir-insulation-1172606723.jpg?v=1749567839"},{"product_id":"80mm-celotex-ga4080-pir-insulation-board-2400mm-x-1200mm-x-80mm","title":"80mm Celotex GA4080 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eTowards the upper end of the general-purpose GA4000 range, 80mm Celotex GA4080 is a rigid polyisocyanurate (PIR) insulation board for floors, walls and roofs. It is the thickness to reach for when the mid-range boards fall just short of a target U-value but a move to the thicker XR4000 range is not yet warranted.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 2400mm x 1200mm x 80mm, each board covers 2.88m² and is sold individually. It carries a declared thermal conductivity of 0.022 W\/mK and a thermal resistance of 3.60 m²K\/W, the highest single-board figure short of the 90mm and 100mm boards, while still weighing a manageable 2.96 kg per square metre.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe closed-cell PIR core gives the board the rigidity to sit in floor build-ups as well as walls and roofs, and both faces are finished with a low-emissivity aluminium foil that adds performance where the board meets a sealed cavity air space. Square edges butt together without a profile to align, keeping the fit quick and the insulation layer continuous so heat is not lost through poorly closed joints.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e80mm GA4080 is at home in floor build-ups working towards tighter U-value targets, in pitched roofs fitted between or under rafters, and in timber-framed walls and internal dry lining, with flat-roof build-ups also within the GA4000 range's scope. It should be installed to the latest Celotex technical guidance, the project specification and current Building Regulations, including the height limit on external wall use. On new build or refurbishment, the 80mm board hands specifiers extra single-layer resistance while keeping the familiar GA4000 board format.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 80mm Celotex GA4080:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e80mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 3.60 m²K\/W, among the strongest single-board figures in the GA4000 range.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, holding the build-up depth down for a demanding U-value.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA higher-performing GA4000 thickness for floors and roofs targeting tighter U-values.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, adding performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSquare edges for quick, flush, gap-minimising joints.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRigid and still manageable at 2.96 kg per square metre, straightforward to handle and cut on site.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFor U-value targets beyond a single 80mm layer, the board can be doubled up, or look to the thicker XR4000 range (110mm and above).\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBringing extra single-layer resistance to floors, walls and roofs, 80mm Celotex GA4080 lets you push towards tighter U-values while keeping the GA4000 board easy to specify and quick to fit.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eImportant Notice: \u003c\/strong\u003ePlease 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655815328078,"sku":"BM000744","price":36.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4080-pir-insulation-board-2400mm-x-1200mm-x-80mm-80mm-bm000744-pir-insulation-1172606719.jpg?v=1749567729"},{"product_id":"90mm-celotex-ga4090-pir-insulation-board-2400mm-x-1200mm-x-90mm","title":"90mm Celotex GA4090 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eSitting 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBecause 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOn 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 90mm Celotex GA4090:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e90mm rigid polyisocyanurate (PIR) insulation board from the multi-application GA4000 range, for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 4.05 m²K\/W, the second-highest single-board figure in the GA4000 range.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, holding the build-up depth down at a higher level of performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA high-performance thickness for floors and pitched roofs working towards lower U-values.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSuits both single-layer use and two-layer roof build-ups between and under rafters.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSquare edges for flush, tight joints and a continuous insulation layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m², at around 3.31 kg per square metre.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFor two-layer roof build-ups, stagger the board joints between layers so they do not line up, keeping the insulation continuous.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe U-value of the finished element depends on the full build-up, not the board alone: confirm your target before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 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.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e 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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655815524686,"sku":"BM000746","price":38.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4090-pir-insulation-board-2400mm-x-1200mm-x-90mm-90mm-bm000746-pir-insulation-1172606715.jpg?v=1749567717"},{"product_id":"100mm-celotex-ga4100-pir-insulation-board-2400mm-x-1200mm-x-100mm","title":"100mm Celotex GA4100 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eCelotex is now Sopratherm. This board is also sold as Sopratherm, with the same code, the same UK manufacturing and the same declared thermal conductivity.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAs the thickest board in the general-purpose GA4000 range, 100mm Celotex GA4100 is the most widely specified Celotex polyisocyanurate (PIR) thickness and a default choice across floors, walls and roofs. The round-number 100mm depth carries the highest single-board thermal resistance in the range, which is why it is so often the board reached for first on solid floors, underfloor heating and standard build-ups.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach board measures 2400mm x 1200mm, covers 2.88m² and is sold individually. With a declared thermal conductivity of 0.022 W\/mK and a thermal resistance of 4.50 m²K\/W, 100mm GA4100 delivers the strongest single-layer figure in the GA4000 range, at around 4.15 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 butt together for a continuous, tight-jointed layer.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOn solid ground floors, 100mm GA4100 is typically laid over the damp-proof membrane beneath the screed, where it commonly meets the Part L floor target, and it suits underfloor heating, beam-and-block, oversite and suspended timber floors equally well. The same board is used as a single layer in pitched roofs between or under rafters, in timber-frame walls and internal dry lining, and in flat-roof build-ups within the GA4000 range's scope. 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. For new build and refurbishment alike, the 100mm board offers the range's strongest single-layer resistance in the standard GA4000 format and handling.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 100mm Celotex GA4100:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e100mm rigid polyisocyanurate (PIR) board, the range-topping and most widely specified thickness in the general-purpose GA4000 range, for floors, walls and roofs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 4.50 m²K\/W, the highest single-board figure in the GA4000 range.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, delivering that resistance in a slim 100mm build-up.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe default choice for solid ground floors beneath screed and for underfloor heating, where the round 100mm depth commonly meets the Part L floor target.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWorks as a strong single layer in pitched roofs, timber-frame walls and internal dry lining, and in flat-roof build-ups within the GA4000 scope.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLow-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSquare edges for flush, tight joints and a continuous insulation layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufactured with a blowing agent of zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), free of CFCs and HCFCs.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m², at around 4.15 kg per square metre.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is printed on one side only: fit the board with the plain face towards the cavity for the rated thermal performance.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eOn a solid floor, lay the boards over the damp-proof membrane beneath the screed, with joints staggered and taped with aluminium foil tape.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe foil facing is not a vapour control layer; many build-ups still need a separate VCL to manage interstitial condensation.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eIn wall applications the board should be covered with a fire-rated lining, such as 12.5mm plasterboard.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCelotex GA4000 should not be used in the external walls of buildings over 11 metres in height; check current Building Regulations for your project.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInsulation UK offers a bespoke cutting service, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAs the range-topping GA4000 board, 100mm Celotex GA4100 brings the strongest single-layer thermal resistance in the general-purpose range to floors, walls and roofs, keeping specification simple while supporting lower U-values and lasting energy efficiency.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e 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.\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655816671566,"sku":"BM000747","price":39.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-ga4100-pir-insulation-board-2400mm-x-1200mm-x-100mm-100mm-bm000747-pir-insulation-1172606711.jpg?v=1749567607"}],"url":"https:\/\/www.insulationuk.co.uk\/collections\/celotex-ga4000.oembed","provider":"Insulation UK","version":"1.0","type":"link"}