{"product_id":"cork-insulation-board-natural-breathable-roof-insulation","title":"Cork Insulation Board – Natural Breathable Roof \u0026amp; Building Insulation, 3 Thicknesses","description":"\u003ch2\u003eA roof insulation material that breathes as well as it insulates\u003c\/h2\u003e\n\u003cp\u003eMost rigid roof insulation forces a choice: get the thermal performance you need, or keep the roof build-up breathable enough to avoid trapping moisture in old timber, lime-rendered walls or a period conversion. Expanded cork insulation board is one of the few materials that does not force that trade-off. Pressed from cork-oak granules using nothing but the tree's own natural resin as a binder, it insulates, dampens sound and lets a roof structure manage moisture vapour the way it was built to — which is exactly why timber-frame builders, eco-renovators and conservation-minded roofers keep specifying it on jobs where foil-faced foam board is the wrong answer.\u003c\/p\u003e\n\u003cp\u003eEach board is cut to a full 1000 x 500mm and supplied in factory packs, so an order maps directly onto the area you are covering rather than a guessed quantity of loose sheets. Use it between and over rafters on a warm or cold pitched roof, as a breathable overlay on a flat roof deck, or anywhere a natural, vapour-permeable insulant needs to sit alongside timber, lime or masonry without introducing a vapour barrier the rest of the build-up cannot cope with.\u003c\/p\u003e\n\u003ch3\u003eKey benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e100% natural expanded cork – no added chemical binders, resins or blowing agents\u003c\/li\u003e\n\u003cli\u003eVapour-permeable construction that supports breathable, moisture-safe roof and wall build-ups\u003c\/li\u003e\n\u003cli\u003eLow thermal conductivity (λ 0.037–0.040 W\/m·K) for genuine year-round thermal performance\u003c\/li\u003e\n\u003cli\u003eNaturally flame-resistant, rot-resistant and dimensionally stable – no chemical fire retardants added\u003c\/li\u003e\n\u003cli\u003eDoubles as an effective acoustic and anti-vibration layer, useful under living roofs and habitable loft conversions\u003c\/li\u003e\n\u003cli\u003eFully recyclable and biodegradable at end of life, harvested from cork oak bark without felling the tree\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable applications\u003c\/h3\u003e\n\u003cp\u003ePitched and flat roof insulation between\/over rafters, breathable warm-roof and cold-roof build-ups, timber-frame roof and wall sarking, insulation retrofits on solid masonry and lime-rendered buildings, acoustic decoupling under roof terraces and living roofs, and any application calling for a natural alternative to PIR or PU foam board.\u003c\/p\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eBoard size\u003c\/th\u003e\n\u003cth\u003eBoards per pack\u003c\/th\u003e\n\u003cth\u003eCoverage\u003c\/th\u003e\n\u003cth\u003eThermal conductivity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003ctd\u003e1000 x 500mm\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e15m²\u003c\/td\u003e\n\u003ctd\u003eλ 0.037–0.040 W\/m·K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003ctd\u003e1000 x 500mm\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e4m²\u003c\/td\u003e\n\u003ctd\u003eλ 0.037–0.040 W\/m·K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003ctd\u003e1000 x 500mm\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e3m²\u003c\/td\u003e\n\u003ctd\u003eλ 0.037–0.040 W\/m·K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs cork board a like-for-like swap for PIR or PU foam board?\u003c\/strong\u003e\u003cbr\u003eNot quite – cork is vapour-permeable where PIR is not, so it belongs in a breathable build-up rather than a sealed warm-roof system. For a foil-faced, high-performance warm-roof board, see our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/pir-insulation-board-foil-faced-2400-x-1200mm\"\u003ePIR Insulation Board\u003c\/a\u003e instead; for a breathable timber-frame alternative closer to cork's own performance profile, see our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/wood-fibre-sarking-insulation-board-breathable-timber-frame\"\u003eWood Fibre Sarking \u0026amp; Insulation Board\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be fixed directly to solid masonry?\u003c\/strong\u003e\u003cbr\u003eYes, using a lime-based adhesive mortar rather than a cement- or gypsum-based product, so the wall keeps its ability to breathe. A registered installer or your building control adviser can confirm the right fixing spec for a listed or solid-wall building.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need a separate breather membrane over the top?\u003c\/strong\u003e\u003cbr\u003eOn most pitched roof build-ups, yes – pair it with a \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/breathable-roofing-membrane-125gsm-roof-wall-underlay\"\u003eBreathable Roofing Membrane\u003c\/a\u003e above the rafters to shed any incidental moisture while still allowing the structure to dry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many boards will I need?\u003c\/strong\u003e\u003cbr\u003eMeasure the total area in square metres and choose the thickness pack (or combination of packs) whose coverage meets or slightly exceeds it – the table above gives the exact coverage per pack for each thickness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it treated with any chemical fire retardant?\u003c\/strong\u003e\u003cbr\u003eNo – cork's fire resistance is a natural property of the material itself, not an added treatment. No specific fire test certificate is quoted here; ask us for the manufacturer's datasheet if your project has a formal fire-rating requirement.\u003c\/p\u003e\n\u003ch3\u003eOrdering \u0026amp; installation guidance\u003c\/h3\u003e\n\u003cp\u003eOrder the pack size that matches your measured area in square metres. Boards can be cut on site with a fine-tooth saw or bread knife to fit around rafters, joists and services. For a complete breathable roof build-up, pair Cork Insulation Board with our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/breathable-roofing-membrane-125gsm-roof-wall-underlay\"\u003eBreathable Roofing Membrane\u003c\/a\u003e as an over-rafter layer, or compare it against our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/wood-fibre-sarking-insulation-board-breathable-timber-frame\"\u003eWood Fibre Sarking \u0026amp; Insulation Board\u003c\/a\u003e if a timber-fibre board suits your build-up better. For sealed warm-roof applications where vapour permeability is not required, our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/pir-insulation-board-foil-faced-2400-x-1200mm\"\u003ePIR Insulation Board\u003c\/a\u003e offers higher thermal performance per millimetre.\u003c\/p\u003e","brand":"Rubber Roof UK","offers":[{"title":"10mm (15m² Pack)","offer_id":67510748905663,"sku":"RRUK-CORK-10-15","price":399.99,"currency_code":"GBP","in_stock":true},{"title":"40mm (4m² Pack)","offer_id":67510748938431,"sku":"RRUK-CORK-40-4","price":359.99,"currency_code":"GBP","in_stock":true},{"title":"50mm (3m² Pack)","offer_id":67510748971199,"sku":"RRUK-CORK-50-3","price":359.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/cork-insulation-board-installed-between-roof-rafters.jpg?v=1790497669","url":"https:\/\/rubberroofuk.uk\/products\/cork-insulation-board-natural-breathable-roof-insulation","provider":"Rubber Roof UK","version":"1.0","type":"link"}