{"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","url":"https:\/\/supplyyard.co.uk\/products\/100mm-celotex-cavity-wall-insulation-board-1200mm-x-450mm-3-24m2-pack","provider":"Supply Yard","version":"1.0","type":"link"}