{"title":"Celotex XR4000","description":"","products":[{"product_id":"110mm-celotex-xr4110-pir-insulation-board-2400mm-x-1200mm-x-110mm","title":"110mm Celotex XR4110 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e110mm Celotex XR4110 is a rigid polyisocyanurate (PIR) insulation board and the entry thickness in the XR4000 range, the boards Celotex builds for cut-to-fit work between and under rafters and joists. It picks up where the general-purpose GA4000 range tops out: where a single 100mm layer no longer reaches the target U-value, the 110mm XR4110 takes the next step in one board rather than two layers.\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 it carries a thermal resistance of 5.00 m²K\/W, the entry figure in the XR4000 range and a step beyond the 4.50 m²K\/W ceiling of the general-purpose GA4000 boards, at a maximum board weight of around 4.54 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that improves 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\"\u003eThe 110mm depth is the point of the board: it lifts single-layer thermal resistance to 5.00 m²K\/W while staying slim enough to fit cleanly between standard rafter and joist depths, so one cut-to-fit layer can hit a target that would otherwise need a second board and the extra joint line that comes with it.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4110 is used as a single cut-to-fit layer between or under rafters and joists in pitched and flat roofs, across solid masonry walls and timber- and steel-framed systems, and in solid and suspended floors. 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. For new build and refurbishment alike, the 110mm board is the straightforward way to step up from the general-purpose range without changing how the boards handle on site.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 110mm Celotex XR4110:\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\"\u003e110mm rigid polyisocyanurate (PIR) board, the entry thickness in the XR4000 cut-to-fit range, for roofs, walls and floors.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 5.00 m²K\/W, taking single-layer performance past the top of the general-purpose 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 110mm build-up.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSized for cut-to-fit installation between and under rafters and joists, where a lower U-value is the target.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eReaches a target in one layer that a 100mm board would need a second layer to meet, cutting joints and handling.\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 4.54 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\"\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 XR4000 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 first step into the XR4000 range, 110mm Celotex XR4110 breaks the 5.00 m²K\/W mark in a single cut-to-fit layer, giving roofs and floors a clean way to reach lower U-values once the general-purpose boards have run out of depth.\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":52655817032014,"sku":"BM000748","price":48.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4110-pir-insulation-board-2400mm-x-1200mm-x-110mm-110mm-bm000748-pir-insulation-1172606707.jpg?v=1749567496"},{"product_id":"120mm-celotex-xr4120-pir-insulation-board-2400mm-x-1200mm-x-120mm","title":"120mm Celotex XR4120 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e120mm Celotex XR4120 is a rigid polyisocyanurate (PIR) insulation board built for cut-to-fit work between and under rafters, and it is the depth Celotex reaches for in loft conversions and room-in-roof builds. At 120mm it pairs with common rafter depths to create a warm, habitable roof space while keeping the insulation inside the slope rather than stealing floor area.\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. A declared thermal conductivity of 0.022 W\/mK gives it a thermal resistance of 5.45 m²K\/W, one step up the XR4000 range from the 110mm board, at a maximum board weight of around 4.93 kg per square metre. The rigid PIR core carries a low-emissivity aluminium foil on both faces to lift performance against a sealed cavity air space, and the square edges close up tight for a continuous run across rafters and joists.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe value of the 120mm depth is headroom: it reaches a habitable-roof U-value in a single between-and-under-rafter layer, so the conversion keeps its ceiling height instead of losing it to a thicker or doubled build-up, and the warm side stays clear for boarding out.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4120 is used between and under rafters in warm pitched roofs and loft conversions, over and between joists in flat roofs, and as a single cut-to-fit layer in solid and suspended floors, masonry walls and timber- and steel-framed systems. 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. Across conversions and new roofs alike, the 120mm board carries the loft U-value target on the rafter line without complicating the build.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 120mm Celotex XR4120:\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\"\u003e120mm rigid polyisocyanurate (PIR) board, the thickness Celotex specifies between and under rafters for loft conversions and room-in-roof builds.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 5.45 m²K\/W, a step up from the 110mm board for tighter U-value targets.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDeclared thermal conductivity of 0.022 W\/mK, reaching that resistance in a 120mm depth that suits common rafter sizes.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCarries a habitable-roof U-value in a single between-and-under-rafter layer, protecting ceiling height in a conversion.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWorks equally as a single cut-to-fit layer in floors, masonry walls and timber- and steel-framed systems.\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 up the slope.\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 a maximum board weight of around 4.93 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\"\u003eThe foil facing is not a vapour control layer; many roof and wall 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 XR4000 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\"\u003eFor loft conversions that have to stay warm without losing height, 120mm Celotex XR4120 puts a 5.45 m²K\/W layer on the rafter line in one board, keeping the build simple and the room above usable.\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":52655817228622,"sku":"BM000749","price":49.31,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4120-pir-insulation-board-2400mm-x-1200mm-x-120mm-120mm-bm000749-pir-insulation-1172606703.jpg?v=1749567485"},{"product_id":"130mm-celotex-xr4130-pir-insulation-board-2400mm-x-1200mm-x-130mm","title":"130mm Celotex XR4130 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e130mm Celotex XR4130 is a rigid polyisocyanurate (PIR) insulation board for floor and roof build-ups that need more resistance than the mid-range thicknesses give while staying a single cut-to-fit layer. At 130mm it answers the stricter U-value targets that come up on solid floors and warm roofs, where the specification has moved past 110mm and 120mm but a second board is not wanted.\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 it reaches a thermal resistance of 5.90 m²K\/W, closing on the 6.00 mark and sitting two steps above the entry XR4110, at a maximum board weight of around 5.32 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges butt up for a continuous, tight-jointed layer.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWhat the extra 10mm over the 120mm board buys is margin: 130mm lifts single-layer resistance to 5.90 m²K\/W, so a floor or roof can clear a tighter U-value on one board rather than two, keeping the build-up depth and the number of taped joints down.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4130 works as a single cut-to-fit layer in solid and suspended floors, in warm flat and pitched roofs between or under rafters and joists, and across masonry walls and timber- and steel-framed systems. 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 a project calls for a firmer floor or roof U-value without a doubled layer, the 130mm board carries it in one pass.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 130mm Celotex XR4130:\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\"\u003e130mm rigid polyisocyanurate (PIR) board, a deeper single-layer option for floors and roofs working to stricter U-value targets.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 5.90 m²K\/W, closing on the 6.00 mark for tighter specifications.\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 130mm depth.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eMeets a stricter floor or roof U-value in a single cut-to-fit layer, avoiding a second board and the extra joints with it.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSuits solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.\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 a maximum board weight of around 5.32 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\"\u003eThe foil facing is not a vapour control layer; many floor and roof 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 XR4000 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\"\u003eWhen a floor or roof specification tightens but the build still has to come together in one layer, 130mm Celotex XR4130 brings 5.90 m²K\/W to the line, holding the target without the depth and joints of a doubled board.\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":52655817359694,"sku":"BM000750","price":59.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4130-pir-insulation-board-2400mm-x-1200mm-x-130mm-130mm-bm000750-pir-insulation-1172606699.jpg?v=1749567373"},{"product_id":"140mm-celotex-xr4140-pir-insulation-board-2400mm-x-1200mm-x-140mm","title":"140mm Celotex XR4140 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e140mm 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.\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. 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4140 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.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 140mm Celotex XR4140:\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\"\u003e140mm rigid polyisocyanurate (PIR) board, the first XR4000 thickness to carry a single-layer R-value above 6.0, for demanding floor and roof targets.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 6.35 m²K\/W, suited to new-build and low-energy specifications.\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 140mm depth.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eMatches deeper joist and rafter zones and thicker floor build-ups, taking the target in a single layer.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eUsed across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.\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 a maximum board weight of around 5.71 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 below screed, separate the foil facing from the screed with a damp-proof membrane: wet cement screed can react with bare aluminium foil.\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 floor and roof 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 XR4000 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\"\u003eFor 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.\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":52655818572110,"sku":"BM000751","price":59.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4140-pir-insulation-board-2400mm-x-1200mm-x-140mm-140mm-bm000751-pir-insulation-1172606695.jpg?v=1749567361"},{"product_id":"150mm-celotex-xr4150-pir-insulation-board-2400mm-x-1200mm-x-150mm","title":"150mm Celotex XR4150 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e150mm Celotex XR4150 is a rigid polyisocyanurate (PIR) insulation board and the thickest in the standard XR4000 line-up, the 110mm to 150mm boards Celotex builds for cut-to-fit work where space is not the limiting factor. At 150mm it carries the highest single-layer resistance of those everyday thicknesses, which is why it lands on low-energy and high-performance projects asking floors, walls and roofs to clear a demanding U-value in one pass.\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. A declared thermal conductivity of 0.022 W\/mK gives it a thermal resistance of 6.80 m²K\/W, the highest figure in the standard 110mm to 150mm XR4000 range and within reach of 7.0, at a maximum board weight of around 6.10 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges close up for a continuous, tight-jointed layer.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 6.80 m²K\/W the 150mm board carries more resistance per sheet than any other everyday XR thickness, so a demanding floor or roof target is met with a single layer and the fewest boards, joints and tape runs: the build-up stays simple even as the performance climbs.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4150 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, most often on low-energy and high-performance builds. 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 space allows the depth, the 150mm board reaches it in one layer.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 150mm Celotex XR4150:\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\"\u003e150mm rigid polyisocyanurate (PIR) board, the highest-resistance thickness in the standard 110mm to 150mm XR4000 range, for demanding single-layer targets.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 6.80 m²K\/W, within reach of 7.0, for low-energy and high-performance envelopes.\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 150mm depth.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCarries more resistance per sheet than any other everyday XR thickness, meeting a demanding target with the fewest boards and joints.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eUsed across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.\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 a maximum board weight of around 6.10 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\"\u003eThe foil facing is not a vapour control layer; many floor and roof 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 XR4000 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\"\u003eWhen the target sits at the demanding end and there is depth to give it, 150mm Celotex XR4150 puts the highest single-layer resistance in the standard XR4000 range onto the floor, wall or roof, holding a tough U-value in one board.\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":52655818703182,"sku":"BM000752","price":58.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4150-pir-insulation-board-2400mm-x-1200mm-x-150mm-150mm-bm000752-pir-insulation-1172606691.jpg?v=1749567249"},{"product_id":"200mm-celotex-xr4200-pir-insulation-board-2400mm-x-1200mm-x-200mm","title":"200mm Celotex XR4200 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per board","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\"\u003e200mm Celotex XR4200 is a rigid polyisocyanurate (PIR) insulation board and the range-topping thickness in the XR4000 line-up, the thickest PIR board Celotex supplies. It sits at the top of the range for one reason: where a floor or roof has to reach a very low, near-passive U-value, 200mm delivers it in a single board rather than a doubled build-up.\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. A declared thermal conductivity of 0.022 W\/mK gives it a thermal resistance of 9.05 m²K\/W, the highest single-board figure in the entire XR4000 range, at a maximum board weight of around 8.06 kg per square metre. The rigid PIR core is faced both sides with a low-emissivity aluminium foil that improves performance against a sealed cavity air space, and the square edges close up for a continuous, tight-jointed layer.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 9.05 m²K\/W a single 200mm board carries the resistance that thinner thicknesses can only reach by doubling up, so the most demanding target is met in one layer: one set of joints to tape, one plane of insulation, and no interface between two boards to detail.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXR4200 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 near-passive and high-performance projects where the U-value target sits at the strict end. 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. As the thickest board in the range it is a special-order line, so allow additional lead time and confirm the build-up has the depth before specifying.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eKey Benefits of 200mm Celotex XR4200:\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\"\u003e200mm rigid polyisocyanurate (PIR) board, the range-topping thickness in the XR4000 line-up and the thickest PIR board Celotex supplies.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThermal resistance (R-value) of 9.05 m²K\/W, the highest single-board figure in the whole XR4000 range, for near-passive and high-performance targets.\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 single 200mm board.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eReaches a very low U-value in one layer that thinner boards would meet only by doubling up, cutting joints and board interfaces.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eUsed across solid and suspended floors, warm flat and pitched roofs, masonry walls and timber- and steel-framed systems.\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 a maximum board weight of around 8.06 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\"\u003eAs the thickest board in the range, 200mm XR4200 is a special-order line: allow additional lead time when planning delivery.\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\"\u003eThe foil facing is not a vapour control layer; many floor and roof 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 XR4000 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\"\u003eWhen the U-value target sits at the strict, near-passive end and the build-up has room for the full depth, 200mm Celotex XR4200 brings the range's highest single-board resistance to the floor or roof, doing in one layer what would otherwise take two.\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":52655819260238,"sku":"BM000754","price":141.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0894\/1083\/0670\/files\/celotex-celotex-xr4200-pir-insulation-board-2400mm-x-1200mm-x-200mm-200mm-bm000754-pir-insulation-1172606687.jpg?v=1749567237"}],"url":"https:\/\/www.insulationuk.co.uk\/collections\/celotex-xr4000.oembed","provider":"Insulation UK","version":"1.0","type":"link"}