{"product_id":"115mm-celotex-thermaclass-cavity-wall-21-full-fill-insulation-board-t-g-1190mm-x-450mm-2-68m2-pack","title":"115mm Celotex Thermaclass Cavity Wall 21 Full Fill Insulation Board T\u0026G 1190mm x 450mm (2.68m2\/Pack)","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eCelotex Thermaclass Cavity Wall 21 Full Fill Insulation Board with a 115mm thickness and 1190mm × 450mm dimensions.\u003cbr\u003e \u003cbr\u003eHigh-performance rigid polyisocyanurate (PIR) insulation board designed for use in full fill masonry cavity wall applications. Manufactured with a low emissivity foil facing, it delivers exceptional thermal conductivity of 0.021 W\/mK, helping achieve low U-values while reducing overall wall thickness requirements.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eThe tongue and groove edge profile provides a tight, secure fit, minimising air gaps and thermal bridging. The board can be installed as a full fill solution or with a residual cavity of up to 10mm to accommodate mortar squeeze and simplify installation.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eLightweight, rigid, and easy to handle, the board fits standard wall tie spacing, supporting fast, efficient on-site fitting. 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","url":"https:\/\/supplyyard.co.uk\/products\/115mm-celotex-thermaclass-cavity-wall-21-full-fill-insulation-board-t-g-1190mm-x-450mm-2-68m2-pack","provider":"Supply Yard","version":"1.0","type":"link"}