{"product_id":"100mm-celotex-ga4100-pir-insulation-board-2400mm-x-1200mm","title":"100mm Celotex GA4100 PIR Insulation Board 2.4m x 1.2m - 2.88m2 per sheet","description":"\u003cp\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\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 \u003ca href=\"https:\/\/www.insulationuk.co.uk\/collections\/concrete-floor-insulation\"\u003esolid floors\u003c\/a\u003e, \u003ca href=\"https:\/\/www.insulationuk.co.uk\/collections\/underfloor-heating-insulation\"\u003eunderfloor heating\u003c\/a\u003e and standard build-ups. Celotex GA4100 is the 100mm board in a range stocked from 20mm up to 200mm, so if you need a thinner or thicker board for your build up you can match the depth to your target U-value.\u003c\/p\u003e\n\u003cp\u003eEach board measures 2400mm x 1200mm, covers 2.88m² and is sold individually. With a declared thermal conductivity of 0.022 W\/mK and an R-value (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\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\u003ch2\u003eKey Benefits of 100mm Celotex GA4100:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\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\u003eThermal resistance (R-value) of 4.50 m²K\/W, the highest single-board figure in the GA4000 range.\u003c\/li\u003e\n\u003cli\u003eDeclared thermal conductivity of 0.022 W\/mK, delivering that resistance in a slim 100mm build-up.\u003c\/li\u003e\n\u003cli\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\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\u003eLow-emissivity aluminium foil facings on both sides, improving performance against sealed and cavity air spaces.\u003c\/li\u003e\n\u003cli\u003eSquare edges for flush, tight joints and a continuous insulation layer.\u003c\/li\u003e\n\u003cli\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\u003eSupplied as a single 2400mm x 1200mm board covering 2.88m², at around 4.15 kg per square metre.\u003c\/li\u003e\n\u003cli\u003eBBA certified (Certificate 25\/7318) for defined pitched roof, dry lining and floor applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e100mm Celotex good to know:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBoards measure 2400mm x 1200mm and are sold individually, each covering 2.88m².\u003c\/li\u003e\n\u003cli\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\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\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\u003eIn wall applications the board should be covered with a fire-rated lining, such as 12.5mm plasterboard.\u003c\/li\u003e\n\u003cli\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\u003ePIR is moisture resistant but not waterproof: store boards flat, off the ground, dry and out of prolonged sunlight.\u003c\/li\u003e\n\u003cli\u003eInsulation UK offers a \u003ca href=\"https:\/\/www.insulationuk.co.uk\/pages\/bespoke-cutting-service\"\u003ebespoke cutting service\u003c\/a\u003e, supplying boards cut to your sizes to reduce waste and on-site mess.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\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.\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"Default Title","offer_id":52655816671566,"sku":"BM000747","price":37.74,"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\/products\/100mm-celotex-ga4100-pir-insulation-board-2400mm-x-1200mm","provider":"Insulation UK","version":"1.0","type":"link"}