--- product_id: 60556217 title: "Xtratherm 50mm High Performance Polyisocyanurate Foam Insulating Sheet for Floor or Roof" brand: "xtratherm or celotex" price: "FREE" currency: GBP in_stock: false reviews_count: 6 url: https://www.desertcart.co.uk/products/60556217-xtratherm-50mm-high-performance-polyisocyanurate-foam-insulating-sheet-for-floor store_origin: GB region: United Kingdom --- # Low GWP & zero ODP eco-friendly insulation 2400x1200x50mm panel size Lambda 0.022 W/mK ultra-low thermal conductivity Xtratherm 50mm High Performance Polyisocyanurate Foam Insulating Sheet for Floor or Roof **Brand:** xtratherm or celotex **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > πŸ”₯ Stay warm, save energy, and build smarter with Xtratherm! ## Quick Answers - **What is this?** Xtratherm 50mm High Performance Polyisocyanurate Foam Insulating Sheet for Floor or Roof by xtratherm or celotex - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/60556217-xtratherm-50mm-high-performance-polyisocyanurate-foam-insulating-sheet-for-floor) ## Best For - xtratherm or celotex enthusiasts ## Why This Product - Trusted xtratherm or celotex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Eco-Conscious Choice:** Low global warming potential and zero ozone depletion for future-proof builds - β€’ **Versatile Application:** Ideal for floors, roofs, and timber frame wallsβ€”adapt to any project - β€’ **Certified Quality Assurance:** Backed by BBA certification for trusted, high-performance insulation - β€’ **Next-Level Thermal Efficiency:** Achieve superior heat retention with a Lambda value of 0.022 W/mK - β€’ **Precision Engineered Dimensions:** Perfectly sized 2400x1200x50mm sheets for seamless installation ## Overview Xtratherm 50mm Polyisocyanurate Foam Insulating Sheets deliver industry-leading thermal performance with a low Lambda value of 0.022 W/mK. Sized at 2400x1200mm, these lightweight 5kg panels are perfect for floor, roof, and timber frame wall insulation. Certified by BBA and designed with eco-friendly materials featuring low global warming potential and zero ozone depletion, Xtratherm ensures efficient, sustainable, and reliable insulation for modern construction projects across mainland UK. ## Description Product Description offering enhanced thermal performance in cavity air spaces Kids wall such as timber frame walls and roof pitched applications, Celotex GA4000 Is a high-performance: PIR insulation board that Offers high performance insulation with low emissivity foil facings offering enhanced thermal performance within cavity air spaces Kids wall Is certified under BBA certificate number 95/09/4667 3197 and Is suitable for a number of applications Including roof, wall and floor systems Is available as a BIM object Has low global warming potential (GWP) and zero ozone depletion potential (ODP) Future-proof alcoholic beverages the energy performance of new and existing buildings Legal Disclaimer ***Delivery is for most of UK mainland.Highlands, Islands & Ireland etc may incur an extra charge.*** Delivery is to Uk Mainland only ( zone 2 & 3) The below list will incur a extra charge please email us for charges , If you purchase with out contacting us first we will not attempt to ship until YOU contact us !! All Postcodes , Scotland KW , IV , AB , DD , PH , PA , FK , KY, KA Devon TR , Part of PL, Part of EX, Part of TQ all of Northern Ireland and Ireland All Islands other zone may incur a surcharge, please email us for prices * Please ensure you leave a contact telephone number for the delivery driver* Part of the less2build Group ## Features - Delivery to mainland UK only &South Wales Contact number required for driver delivery - Suitable for a wide variety of applications including roof, wall and floor insulation. - We will provide you with XthaTherm Celotex or depending on location - Dimensions: 2400 x 1200 x 50 mm Lambda: 0.022 W/mK - Provides better thermal performance in the confined air cavity, such as sharp wooden walls and frame ro ## Technical Specifications | Specification | Value | |---------------|-------| | UPC | 799493546309 | | Product Dimensions | 240 x 120 x 0.1 cm; 5 kg | | Item Package Quantity | 1 | | Coverage | 28,800 square centimeters | | Batteries included? | No | | Batteries Required? | No | | Item Weight | 5 kg | ## Product Details - **Material:** Polyisocyanurate - **Item thickness:** 5E+1 Millimetres - **Recommended uses for product:** roof insulation, wall insulation, floor insulation - **Product dimensions:** 2.4L x 1.2W metres - **Manufacturer:** Xtratherm or Celotex ## Images ![Xtratherm 50mm High Performance Polyisocyanurate Foam Insulating Sheet for Floor or Roof - Image 1](https://m.media-amazon.com/images/I/41wjEshweOL.jpg) ## Questions & Answers **Q: Anyone know whether this insulation is good for soundproofing?** A: This is heat insulation material. You need specific product such as :- http://www.wickes.co.uk/Knauf-Sound-Panel-Tapered-Edge-2400x1200x12-5mm/p/224657 **Q: Can this item be used on a garage ceiling?** A: YES CUT JUST UNDERSIZE FILL GAPS WITH EXPANDING FOAM FILLER TO SECURE **Q: if this is placed onto cement floor, how much self levelling compound should go on top before tiling?** A: I myself would not use self leveling on top of Xtra therm cement i would rather use interlocking chipboard 3/4 inch thick, my floor with tiles has not moved at all in 10 years **Q: can it be used for loft conversion, before the boards go on, instead of the foil to the timber ?** A: Insulation between the rafters* For optimum thermal performance the unprinted foil surface should face the rafter air cavity.* Accurately measure the width to be filled between the inside face of the rafters, prior to cutting the board.* Use the Celotex Insulation Saw to cut the Celotex board at a slight angle, making the board width slightly oversized on onesurface to achieve a `friction it'.* Push the board into the void between the rafters until it is tight against the underside of the first layer of insulation.* To hold the boards in place, use battens along the side of the rafters.* Tightly fit the insulation to the ridge plate and carry over and tightly butt the wall plate at eaves.* A vapour control layer (VCL) should be installed to the underside of the rafters. A polythene sheet of higher vapour resistance isrecommended for high humidity areas such as kitchens or bathrooms.* Finish with plasterboard or other suitable sheet material, fixed to the rafters. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Top insulation *by A***E on 20 April 2019* Really good price, I looked on loads of sites including the ones that delivered it and couldn't find it cheaper elsewhere ### ⭐⭐⭐⭐ Does what it claims *by C***S on 5 December 2013* The product is fine. It is a bit pricey hence not 5 stars. Would buy it again when insulation of this type is needed. ### ⭐⭐⭐⭐⭐ Five Stars *by K***H on 7 February 2016* Perfect good sold insulation used in my extension --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/60556217-xtratherm-50mm-high-performance-polyisocyanurate-foam-insulating-sheet-for-floor](https://www.desertcart.co.uk/products/60556217-xtratherm-50mm-high-performance-polyisocyanurate-foam-insulating-sheet-for-floor) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-14*