{"title":"Thermal Insulation","description":"","products":[{"product_id":"100mm-knauf-earthwool-dritherm-cavity-wall-insulation-slab-32-pallet-of-20-packs-65-52m2-pallet","title":"100mm Knauf DriTherm Cavity Wall Insulation Slab 32 - Pallet of 30 Packs (98.4m2\/Pallet)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eInsulation pallets ensure you can complete large construction projects with ultimate efficiency. 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Moreover, it makes life much more comfortable for those on-site!\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Knauf Insulation","offers":[{"title":"DriTherm 32","offer_id":53771520442479,"sku":"3002371","price":1453.85,"currency_code":"GBP","in_stock":true},{"title":"DriTherm 37","offer_id":53771520475247,"sku":"3002370","price":1069.67,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/multiple_packs_of_knauf_dritherm_32.jpg?v=1783758593"},{"product_id":"100mm-knauf-earthwool-dritherm-cavity-wall-insulation-slab-32-3-28m2-pack","title":"100mm Knauf DriTherm Cavity Wall Insulation Slab 32 (3.28m2\/Pack)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eFull-fill glass mineral wool insulation slab, measuring 100mm in thickness, for use in masonry cavity walls.\u003cbr\u003e\u003cbr\u003eManufactured with a high recycled glass content and ECOSE® Technology, it delivers advanced thermal insulation while remaining vapour permeable, helping the wall construction to breathe.\u003cbr\u003e\u003cbr\u003eWith a thermal conductivity of 0.032 W\/mK, it provides superior energy efficiency, enabling lower U-values to be achieved at reduced insulation thicknesses.\u003cbr\u003e\u003cbr\u003eRated Euroclass A1 non-combustible and fully BBA certified for all UK exposure zones, it ensures proven fire safety, durability, and long-term reliability.\u003cbr\u003e\u003cbr\u003eAt 100mm thick, the slab is optimised for standard cavity widths used in modern new build housing, offering a balance of high thermal performance, ease of installation, and compatibility with typical masonry wall designs.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; 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Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Multifoil composite panel with reflective outer layers and honeycomb internal structure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal performance:\u003c\/strong\u003e Assessed to relevant thermal performance standards for multifoil insulation systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensional stability:\u003c\/strong\u003e Designed to maintain form during installation and in service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note:\u003c\/strong\u003e Ensure the selected thickness meets the project’s thermal performance requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Actis","offers":[{"title":"105mm","offer_id":53771534893167,"sku":"3006006","price":72.64,"currency_code":"GBP","in_stock":false},{"title":"125mm","offer_id":53771534925935,"sku":"3006007","price":44.84,"currency_code":"GBP","in_stock":false},{"title":"140mm","offer_id":53771534958703,"sku":"3006008","price":49.14,"currency_code":"GBP","in_stock":false},{"title":"90mm","offer_id":53771534991471,"sku":"3006016","price":62.53,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/Actis_Hybris_Panel_Multifoil_Insulation_-_Photo.jpg?v=1783758672"},{"product_id":"actis-boost-r-hybrid-reflective-breather-membrane-35mm-10-05m2-roll","title":"Actis Boost'R Hybrid Reflective Breather Membrane 35mm (10.05m2\/Roll)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eActis Boost'R Hybrid Reflective Breather Membrane with a 35mm thickness and 10.05m² roll area is a dual-function insulating and breathable membrane designed to enhance thermal performance while maintaining controlled vapour movement. Its multi-layer reflective structure reduces heat loss through radiation and convection, contributing to improved overall envelope efficiency.\u003cbr\u003e\u003cbr\u003eThe membrane provides water resistance and windtightness on the cold side of the insulation while allowing internal moisture vapour to diffuse outward, protecting structural elements from trapped humidity.\u003cbr\u003e\u003cbr\u003eIts integrated insulation layer supports reduced thermal bridging across rafters and studs, offering dependable performance in roofs and walls where space efficiency is required.\u003cbr\u003e\u003cbr\u003eLightweight and flexible, it adapts easily to uneven surfaces and complex detailing, ensuring consistent coverage in both refurbishment and new build applications.\u003cbr\u003e\u003cbr\u003eThe membrane is suitable for use behind ventilated cladding or roof coverings, forming a protective, high-performance layer that complements hybrid insulation systems. \u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReflective thermal performance\u003c\/strong\u003e: Reduces radiative heat transfer to enhance overall thermal efficiency in roofs and walls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable construction\u003c\/strong\u003e: Allows controlled vapour diffusion to limit condensation risk within the building fabric.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWindtight and water resistant\u003c\/strong\u003e: Protects the structure from wind-driven moisture while maintaining stable internal conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated insulation layer\u003c\/strong\u003e: Provides additional thermal resistance and reduces cold bridging across framing elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight handling\u003c\/strong\u003e: Enables quick, accurate installation on uneven or complex surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile compatibility\u003c\/strong\u003e: Suitable for use with hybrid insulation build-ups and common timber or metal framing systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitched roofs\u003c\/strong\u003e: Provides a reflective, breathable external layer to enhance thermal performance and moisture control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimber frame walls\u003c\/strong\u003e: Supports hybrid insulation arrangements requiring improved thermal resistance with vapour permeability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefurbishment projects\u003c\/strong\u003e: Offers space-efficient thermal enhancement where traditional insulation depth is restricted.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate preparation\u003c\/strong\u003e: Ensure framing, insulation, and sheathing surfaces are clean and suitable for continuous membrane coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMembrane alignment\u003c\/strong\u003e: Unroll the membrane with the reflective surface correctly oriented to achieve declared thermal performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing application\u003c\/strong\u003e: Secure using appropriate staples, battens, or tapes without overstretching the material.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLap detailing\u003c\/strong\u003e: Maintain consistent overlaps and seal where required to preserve windtightness and moisture protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePenetration sealing\u003c\/strong\u003e: Use compatible accessories around openings and service routes to maintain continuous thermal and moisture control.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eCompliance \u0026amp; Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial specification\u003c\/strong\u003e: Manufactured as a multi-layer reflective membrane incorporating a 35mm insulating core.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal behaviour\u003c\/strong\u003e: Designed to reduce radiative heat loss and enhance U-value performance within hybrid systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture management\u003c\/strong\u003e: Functions as a breathable yet water-resistant layer for stable building enclosure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note\u003c\/strong\u003e: Always install according to manufacturer guidance to maintain declared thermal, moisture, and windtightness performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Actis","offers":[{"title":"Default Title","offer_id":53771535024239,"sku":"3006001","price":165.47,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/Actis_Boost_R_Hybrid_Reflective_Breather_Membrane_-_Photo.jpg?v=1783758673"},{"product_id":"actis-hcontrol-hybrid-multifoil-insulation-45mm-10m2-roll","title":"Actis HControl Hybrid Multifoil Insulation 45mm (10m2\/Roll)","description":"\u003cp\u003eActis HCONTROL HYBRID Multifoil insualtion is a thin insulation product with a built-in vapour control function, and an unrivalled thermal performance. \u003cbr\u003e\u003cbr\u003eHCONTROL HYBRID provides dual performance within a single product: a vapour control layer and insulation, allowing a reduction in the number of installation steps whilst reducing the thickness of the main insulation to achieve the same required U-value. \u003cbr\u003e\u003cbr\u003eIt can be used in conjunction with any type of insulation.\u003c\/p\u003e","brand":"Actis","offers":[{"title":"Default Title","offer_id":53771535089775,"sku":"3006004","price":112.55,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/Actis_HControl_Hybrid_Multifoil_Insulation_-_Photo.jpg?v=1783758674"},{"product_id":"actis-isodhesif-tape-100mm-25m-roll","title":"Actis Isodhesif Tape 100mm (25m\/Roll)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eActis Isodhesif Tape with a 100mm width and 25m length is a high-adhesion sealing tape designed for creating continuous airtight and windtight joints within Actis hybrid insulation systems. 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All joints must be tightly butted - 45 degrees downwards towards this outer leaf. This will prevent potential water penetration.\u003c\/p\u003e","brand":"SuperFOIL","offers":[{"title":"Default Title","offer_id":53771535155311,"sku":"3006022","price":103.67,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/SuperCLOSE_Insulated_Cavity_Closer_SC100_-_Photo_Resized.jpg?v=1783758675"},{"product_id":"superclose-insulated-cavity-closer-sc150-100-150mm-cavity-2-4m-24m-pack","title":"SuperCLOSE Insulated Cavity Closer SC150 100-150mm Cavity 2.4m (24m\/Pack)","description":"\u003cp\u003eSuperCLOSE Insulated Cavity Closer SC150 100-150mm can be installed in a variety of ways, such as: tack to window frame if built in, built-in as work progresses friction fitting, after the reveal has been constructed by fixing the inner leaf using grab adhesive. \u003cbr\u003e\u003cbr\u003eIf required, sections of SuperCLOSE can be jointed to minimise waste. All joints must be tightly butted - 45 degrees downwards towards this outer leaf. This will prevent potential water penetration.\u003c\/p\u003e","brand":"SuperFOIL","offers":[{"title":"Default Title","offer_id":53771535220847,"sku":"3006023","price":137.36,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/SuperCLOSE_Insulated_Cavity_Closer_SC150_-_Photo_Resized.jpg?v=1783758675"},{"product_id":"superfoil-sf19-multi-layer-foil-insulation-45mm-15m2-roll","title":"SuperFOIL SF19+ Multi-Layer Foil Insulation 45mm (15m2\/Roll)","description":"\u003ch2\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003e45mm\u003cstrong\u003e\u003c\/strong\u003eSuperFOIL SF19+ Multi-Layer Foil Insulation designed for insulating roofs, walls, and floors where a flexible multi-layer reflective quilt is required.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eThis lightweight multi-layer foil insulation comprises reflective outer layers and internal thermal wadding to reduce heat transfer across building elements. 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The fibre-free phenolic core achieves a low thermal conductivity of 0.018 W\/m·K, supporting strong energy retention in concrete slabs, screeded floors, and suspended timber systems.\u003cbr\u003e\u003cbr\u003eThe board is faced on both sides with a durable glass-tissue layer autohesively bonded to the core, providing a stable surface compatible with common floor build-ups. Its closed-cell structure resists air infiltration and water vapour passage, ensuring consistent long-term performance within the floor assembly.\u003cbr\u003e\u003cbr\u003eA minimum compressive strength of 120 kPa at 10% compression accommodates typical domestic and commercial floor loading when used beneath unreinforced screeds. 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The 115mm thickness is ideal for deeper cavity walls in high-performance housing and commercial developments.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutstanding thermal performance:\u003c\/strong\u003e Declared thermal conductivity of 0.021 W\/mK reduces wall thickness while achieving low U-values.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh performance facer:\u003c\/strong\u003e Low emissivity foil facing improves performance in cavities with up to 10mm air space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision fit:\u003c\/strong\u003e Tongue and groove edge detail ensures close jointing and minimal thermal bridging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEase of installation:\u003c\/strong\u003e Sized for standard wall tie spacing; light, rigid boards are simple to transport and fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified performance:\u003c\/strong\u003e BBA certified for full fill cavity wall use under Certificate 16\/5343.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 115mm board ideal for deeper cavity walls in high-performance housing and commercial developments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull fill cavity walls:\u003c\/strong\u003e Suitable for use between masonry leaves in domestic and commercial buildings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew build housing:\u003c\/strong\u003e Provides excellent U-value compliance in energy-efficient walls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResidual cavity installation:\u003c\/strong\u003e Can be fitted with a 10mm residual cavity to accommodate mortar squeeze.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal upgrade projects:\u003c\/strong\u003e Ideal for meeting advanced energy performance requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Ensure cavity surfaces are clean and free from debris before installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoard placement:\u003c\/strong\u003e Install boards with tongue and groove joints interlocked and staggered in brick bond pattern.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing method:\u003c\/strong\u003e Secure with appropriate retaining clips to wall ties as construction progresses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJoint sealing:\u003c\/strong\u003e Ensure tight-fitting joints with no gaps; seal edges as required by specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResidual cavity:\u003c\/strong\u003e Maintain up to 10mm air space where design requires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Keep boards dry and covered until fully installed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eCompliance \u0026amp; Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial specification:\u003c\/strong\u003e Rigid PIR insulation with low emissivity foil facing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal conductivity:\u003c\/strong\u003e 0.021 W\/m·K (to BS EN 13165).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire performance:\u003c\/strong\u003e Euroclass E reaction to fire to BS EN 13501-1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressive strength:\u003c\/strong\u003e ≥120 kPa at 10% compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater vapour resistance:\u003c\/strong\u003e High resistance due to foil facing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e BBA certified (No. 16\/5343) for full fill cavity wall systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental compliance:\u003c\/strong\u003e Manufactured under ISO 14001:2015 Environmental Management System.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards compliance:\u003c\/strong\u003e UKCA marked to BS EN 13165 for factory-made rigid polyurethane (PU) insulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note:\u003c\/strong\u003e Install and maintain in accordance with Celotex guidance and BBA certification details.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"115mm","offer_id":53771587977327,"sku":"3002376","price":154.05,"currency_code":"GBP","in_stock":false},{"title":"140mm","offer_id":53771588010095,"sku":"3002377","price":150.48,"currency_code":"GBP","in_stock":false},{"title":"90mm","offer_id":53771588042863,"sku":"3002375","price":130.78,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/Celotex_Thermaclass_Cavity_Wall_21_-_Photo.jpg?v=1783758932"},{"product_id":"100mm-celotex-cavity-wall-insulation-board-1200mm-x-450mm-3-24m2-pack","title":"100mm Celotex CW4100 Cavity Wall Insulation Board 1200mm x 450mm (3.24m2\/Pack)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eCelotex CW4100 Cavity Wall Insulation Board measuring 100mm thick and 1200mm × 450mm in size.\u003cbr\u003e \u003cbr\u003eHigh-performance rigid polyisocyanurate (PIR) insulation board designed for use in masonry cavity wall constructions. The board provides excellent thermal performance while maintaining a lightweight, easy-to-handle format for quick installation.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eManufactured with a low-emissivity foil facing on both sides, it enhances the thermal resistance of air spaces within the cavity, contributing to improved overall wall U-values. The PIR core delivers reliable long-term stability and moisture resistance, ensuring consistent insulation performance over the building’s lifespan.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eThe 100mm thickness suits 125mm+ cavities, maximising insulation while retaining the required residual cavity.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh thermal efficiency:\u003c\/strong\u003e PIR core achieves low thermal conductivity for superior insulation performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoil facings:\u003c\/strong\u003e Low-emissivity aluminium facings improve cavity reflectivity and reduce heat loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight design:\u003c\/strong\u003e Easy to cut and fit between wall ties, reducing installation time and waste.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture resistance:\u003c\/strong\u003e Closed-cell structure minimises water absorption for reliable in-cavity performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Rigid board maintains dimensional stability and compressive strength during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 100mm board suits 125mm+ cavities, maximising insulation while retaining the required residual cavity.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMasonry cavity walls:\u003c\/strong\u003e Designed for use between inner and outer leaves of traditional brick and block construction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePartial-fill systems:\u003c\/strong\u003e Suitable for retaining an air gap while improving overall wall insulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew build and refurbishment:\u003c\/strong\u003e Applicable for both domestic and commercial building envelopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy efficiency upgrades:\u003c\/strong\u003e Reduces heat loss and improves compliance with current building regulations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Ensure wall cavities are clean, free from mortar droppings, and dry prior to installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoard placement:\u003c\/strong\u003e Fit boards between wall ties in a staggered pattern with tight-fitting joints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing method:\u003c\/strong\u003e Use retaining clips to secure boards against the inner leaf as construction progresses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJoint sealing:\u003c\/strong\u003e Tightly butt all edges; tape or seal where specified to prevent thermal bridging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Keep boards dry on-site and avoid exposure to prolonged sunlight.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eCompliance \u0026amp; Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial specification:\u003c\/strong\u003e Rigid polyisocyanurate (PIR) insulation with aluminium foil facings both sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal conductivity:\u003c\/strong\u003e 0.022 W\/m·K.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire performance:\u003c\/strong\u003e Class E reaction to fire (BS EN 13501-1).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater vapour resistance:\u003c\/strong\u003e Foil facing provides high resistance to moisture ingress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressive strength:\u003c\/strong\u003e Typically exceeds 120 kPa at 10% compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental compliance:\u003c\/strong\u003e Manufactured under ISO 14001 with zero ODP and low GWP blowing agents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note:\u003c\/strong\u003e Installation must follow Celotex guidance to maintain declared thermal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"100mm","offer_id":53771588075631,"sku":"3002012","price":78.54,"currency_code":"GBP","in_stock":true},{"title":"50mm","offer_id":53771588108399,"sku":"3002014","price":83.05,"currency_code":"GBP","in_stock":true},{"title":"75mm","offer_id":53771588141167,"sku":"3002016","price":82.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/Celotex_Cavity_Wall_Insulation_-_Photo_Resized.jpg?v=1783758933"},{"product_id":"100mm-celotex-ga4100-pir-insulation-board-2400mm-x-1200mm","title":"100mm Celotex GA4100 PIR Insulation Board 2400mm x 1200mm","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eFoil-faced PIR insulation board, measuring 100mm in thickness for use in floors, walls, and roofs. \u003cbr\u003e\u003cbr\u003eManufactured as part of the GA4000 range, it is intended for general application, meaning it can be confidently specified across a broad spectrum of build-ups without the need for specialist products.\u003cbr\u003e\u003cbr\u003eThe board consists of a rigid polyisocyanurate (PIR) core faced with low-emissivity foil on both sides. This construction provides excellent thermal resistance, helping to reduce heat loss through the building fabric while also acting as a vapour control layer. \u003cbr\u003e\u003cbr\u003eAt 100mm thick, the most widely used thickness in the GA range, it is sized to fit most standard cavities and joist depths, making it straightforward to integrate into typical construction details.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal conductivity (0.022 W\/m·K):\u003c\/strong\u003e Reduces the thickness required to meet U-value targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-emissivity foil facings:\u003c\/strong\u003e Reflect radiant heat across cavity air spaces, improving overall efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGA4000 range (general application):\u003c\/strong\u003e Suitable for versatile use across roofs, walls, and floors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid PIR core:\u003c\/strong\u003e Lightweight yet robust, easy to cut and install with standard tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture resistance:\u003c\/strong\u003e Closed-cell core prevents water uptake and preserves thermal performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental credentials:\u003c\/strong\u003e Zero ODP, low GWP blowing agent, and BRE Green Guide Rating A.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBBA certified (17\/5405, 16\/5352):\u003c\/strong\u003e Independent assurance of performance across roofs, walls, and floors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoard size 2400 × 1200mm:\u003c\/strong\u003e Supplied in the industry-standard sheet size for insulation, ensuring compatibility across typical build-ups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness 100mm:\u003c\/strong\u003e Popular and practical size for achieving strong thermal performance in standard build-ups.\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral insulation:\u003c\/strong\u003e Versatile board suitable for a wide range of domestic and commercial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeam and block flooring\u003c\/strong\u003e: Maximum efficiency 100mm PIR boards are installed over the structural floor to provide a continuous thermal barrier beneath sand and cement or liquid screeds. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcrete slab and oversite floors\u003c\/strong\u003e: High compressive strength enables boards to be laid directly over or under ground-bearing slabs to ensure the lowest possible U-values in new-build construction. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuspended timber floors\u003c\/strong\u003e: Rigid boards are cut-to-fit and friction-supported between floor joists to significantly reduce heat loss through ventilated sub-floor voids. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcrete slab overlays\u003c\/strong\u003e: Standard 100mm thickness allows for the upgrade of existing concrete floors to provide a thermal barrier equivalent to modern new-build specifications. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderfloor heating systems\u003c\/strong\u003e: Reflective foil facers on both sides of the board enhance the efficiency of underfloor heating by reflecting heat upwards into the living space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimber frame wall insulation\u003c\/strong\u003e: Maximum efficiency 100mm PIR boards are friction-fitted between timber studs to ensure the highest possible thermal ratings in wall assemblies. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMasonry wall dry-lining\u003c\/strong\u003e: Flagship 100mm boards are fixed to the internal face of solid or cavity masonry walls to provide a thermal barrier equivalent to modern new-build specifications. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitched roof insulation\u003c\/strong\u003e: Full-thickness 100mm boards are installed between or over rafters to create a high-specification, regulation-compliant thermal envelope. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat roof insulation\u003c\/strong\u003e: High compressive strength allows for installation beneath a waterproof membrane or over a structural deck to provide the ultimate thermal solution for the roof covering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSummerhouse and garden room insulation\u003c\/strong\u003e: High-performance 0.022 W\/mK thermal conductivity provides maximum heat retention within timber stud walls and roof rafters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConservatory warm-roof conversions\u003c\/strong\u003e: Optimum 100mm thickness enables roof structures to meet or exceed Part L U-value requirements during solid-roof upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eInstallation Guidance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring and cutting\u003c\/strong\u003e: Measure the aperture accurately and cut the board using a fine-toothed saw or sharp knife for a tight friction fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositioning and fixing\u003c\/strong\u003e: Place the board securely against the substrate or between structural members, ensuring no gaps are left between adjacent boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealing joints\u003c\/strong\u003e: Apply high-quality aluminium foil tape to all board joints to maintain the integrity of the vapour control layer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical attachment\u003c\/strong\u003e: Use appropriate insulation fixings or adhesive as specified by the project requirements to secure boards to walls or ceilings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire lining (wall applications)\u003c\/strong\u003e: Ensure the insulation used in wall applications is covered with a fire-rated lining, such as 12.5mm plasterboard, to meet safety requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eCompliance \u0026amp; Performance\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal conductivity\u003c\/strong\u003e: Achieves a declared Lambda value of 0.022 W\/mK in accordance with BS EN 13165. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressive strength\u003c\/strong\u003e: Rated at ≥140 kPa when tested to BS EN 826, making it suitable for floor applications subject to light loads. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK Building Regulations Part L\u003c\/strong\u003e: Helps meet Part L (Fuel and Power) requirements; however, 100mm may require additional layers to meet specific new-build U-value targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK Building Regulations Part B\u003c\/strong\u003e: Rated as Euroclass E in accordance with BS EN 13501-1; this material is combustible and must be installed behind a fire-rated lining in wall applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUK Building Regulations Part C\u003c\/strong\u003e: Requires the use of a separate Vapour Control Layer (VCL) and taped joints in many applications to prevent interstitial condensation as per Part C (Site preparation and resistance to contaminants and moisture). \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental impact\u003c\/strong\u003e: Zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP) during the manufacturing process. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant note\u003c\/strong\u003e: UK Building Regulations vary by project and location; always consult a Building Control Officer or Architect to confirm this thickness meets the legal U-value requirements for your specific build.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ch2\u003eWhat Customers Are Saying\u003c\/h2\u003e\u003cp\u003eCustomers consistently praise the Celotex GA4100 for its ease of cutting and fitting, particularly in summerhouse, loft conversion and extension projects. Several reviewers highlight how cleanly the boards slot between studs and rafters with minimal waste. Delivery speed and condition on arrival are frequently mentioned, with buyers noting boards arrived undamaged and on schedule. Trade professionals and DIYers alike rate the thermal performance highly, with multiple customers reporting noticeable improvements in room temperature. The competitive pricing compared to other PIR boards is a recurring positive, with several repeat buyers citing Materials Market as their preferred supplier.\u003cbr\u003e\u003cbr\u003e\u003cem\u003eSummarised by AI from customer reviews.\u003c\/em\u003e\u003c\/p\u003e","brand":"Celotex","offers":[{"title":"100mm","offer_id":53771588206703,"sku":"3001017","price":50.39,"currency_code":"GBP","in_stock":true},{"title":"110mm","offer_id":53771588239471,"sku":"3001018","price":58.98,"currency_code":"GBP","in_stock":true},{"title":"120mm","offer_id":53771588272239,"sku":"3001019","price":63.6,"currency_code":"GBP","in_stock":true},{"title":"125mm","offer_id":53771588305007,"sku":"3001153","price":74.03,"currency_code":"GBP","in_stock":true},{"title":"130mm","offer_id":53771588337775,"sku":"3001020","price":73.28,"currency_code":"GBP","in_stock":true},{"title":"140mm","offer_id":53771588370543,"sku":"3001021","price":73.08,"currency_code":"GBP","in_stock":true},{"title":"150mm","offer_id":53771588403311,"sku":"3001022","price":75.59,"currency_code":"GBP","in_stock":true},{"title":"165mm","offer_id":53771588436079,"sku":"3001308","price":108.6,"currency_code":"GBP","in_stock":true},{"title":"200mm","offer_id":53771588468847,"sku":"3001309","price":140.95,"currency_code":"GBP","in_stock":true},{"title":"20mm","offer_id":53771588501615,"sku":"3001023","price":21.36,"currency_code":"GBP","in_stock":true},{"title":"25mm","offer_id":53771588534383,"sku":"3001024","price":19.98,"currency_code":"GBP","in_stock":true},{"title":"30mm","offer_id":53771588567151,"sku":"3001025","price":21.94,"currency_code":"GBP","in_stock":true},{"title":"40mm","offer_id":53771588599919,"sku":"3001026","price":26.88,"currency_code":"GBP","in_stock":true},{"title":"50mm","offer_id":53771588632687,"sku":"3001027","price":28.08,"currency_code":"GBP","in_stock":true},{"title":"60mm","offer_id":53771588665455,"sku":"3001028","price":36.06,"currency_code":"GBP","in_stock":true},{"title":"70mm","offer_id":53771588698223,"sku":"3001029","price":39.95,"currency_code":"GBP","in_stock":true},{"title":"75mm","offer_id":53771588730991,"sku":"3001030","price":41.99,"currency_code":"GBP","in_stock":true},{"title":"80mm","offer_id":53771588763759,"sku":"3001031","price":44.04,"currency_code":"GBP","in_stock":true},{"title":"90mm","offer_id":53771588796527,"sku":"3001032","price":48.48,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9784\/4591\/files\/100mm_celotex_sheet_logo.jpg?v=1783758935"}],"url":"https:\/\/supplyyard.co.uk\/collections\/thermal-insulation.oembed","provider":"Supply Yard","version":"1.0","type":"link"}