{"product_id":"1-5mm-epdm-rubber-roofing-membrane","title":"1.5mm EPDM Rubber Roofing Membrane – Heavy Duty, Cut to Size","description":"\u003cdiv style=\"color:#1F2933;line-height:1.7\"\u003e\n\u003cp style=\"font-size:17px;margin:0 0 18px\"\u003eThe heavy-duty EPDM rubber roofing membrane — around \u003cstrong\u003e25% thicker than the standard 1.2mm\u003c\/strong\u003e — cut to your exact size and supplied as one continuous sheet. It is the specification for roofs that get walked on, commercial spans, and decks where extra toughness earns its keep. Twenty widths from 0.53m to 15.24m, any length up to 30.5m, bonded cold with no torch and no flame.\u003c\/p\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin:0 0 26px\"\u003e\n\u003cspan style=\"border:1px solid #DDE2E8;border-radius:6px;padding:8px 14px;font-size:14px\"\u003e\u003cstrong\u003e1.5mm\u003c\/strong\u003e · heavy duty\u003c\/span\u003e\n\u003cspan style=\"border:1px solid #DDE2E8;border-radius:6px;padding:8px 14px;font-size:14px\"\u003e\u003cstrong\u003eBBA certified\u003c\/strong\u003e · cert. 19\/5670\u003c\/span\u003e\n\u003cspan style=\"border:1px solid #DDE2E8;border-radius:6px;padding:8px 14px;font-size:14px\"\u003e\u003cstrong\u003eUp to 50 years\u003c\/strong\u003e life expectancy\u003c\/span\u003e\n\u003cspan style=\"border:1px solid #DDE2E8;border-radius:6px;padding:8px 14px;font-size:14px\"\u003e\u003cstrong\u003eFree UK delivery\u003c\/strong\u003e · no cutting charge\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eDo you actually need 1.5mm?\u003c\/h2\u003e\n\u003cp\u003eWe would rather sell you the right membrane than the dearest one. \u003cstrong\u003e1.5mm and 1.2mm are equally waterproof\u003c\/strong\u003e — they are the same rubber, both BBA certified, both with a life expectancy of up to 50 years. The extra thickness buys resistance to punctures, tearing and foot traffic. It does not make a roof more watertight; how the sheet is bonded and detailed decides that.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/epdm-membrane-15mm-when-to-choose.jpg?v=1786101498\" alt=\"Decision chart showing when to choose 1.5mm EPDM membrane over 1.2mm: foot traffic, commercial roofs, ballast or pavers, impact risk and uneven decks\" width=\"1264\" height=\"848\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;max-width:900px;margin:18px auto;border-radius:8px\"\u003e\n\u003cp\u003eIf your project is a standard extension, garage, garden room or dormer that nobody walks on, the \u003ca href=\"\/products\/1-2mm-epdm-rubber-roofing-membrane\"\u003e1.2mm membrane\u003c\/a\u003e is the normal specification and will cost you less. For sheds and small outbuildings, \u003ca href=\"\/products\/1-0mm-epdm-rubber-roofing-membrane-durable-one-piece-flat-roof-waterproofing-sheet\"\u003e1.0mm\u003c\/a\u003e is enough. The \u003ca href=\"\/pages\/epdm-thickness-guide\"\u003ethickness guide\u003c\/a\u003e compares all three properly.\u003c\/p\u003e\n\n\u003ch2\u003eHow the pricing works\u003c\/h2\u003e\n\u003cp\u003ePick a width, then set the quantity to the number of metres of length you need. \u003cstrong\u003eEvery width works out at exactly the same rate per square metre\u003c\/strong\u003e — a 0.53m offcut and a 15.24m sheet cost the same per m². No cutting charge, no minimum order, no surcharge for awkward dimensions, and the price shown already includes VAT.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/epdm-membrane-pricing-explained.jpg?v=1786098044\" alt=\"Diagram explaining how cut-to-size EPDM membrane pricing works: pick a width, set the length in metres, price is width times length times the per square metre rate\" width=\"1264\" height=\"848\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;max-width:900px;margin:18px auto;border-radius:8px\"\u003e\n\n\u003ch2\u003eWhat size should you order?\u003c\/h2\u003e\n\u003cp\u003eMeasure the roof deck, then \u003cstrong\u003eadd 150mm to each of the four sides\u003c\/strong\u003e so the rubber can dress down over every edge. Take the next width up from the list and round the length up to whole metres.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/epdm-membrane-measuring-guide.jpg?v=1786098045\" alt=\"Diagram showing how to measure a flat roof deck and add 150mm on every side before ordering EPDM membrane cut to size\" width=\"1264\" height=\"848\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;max-width:900px;margin:18px auto;border-radius:8px\"\u003e\n\u003cp\u003eAdd more than 150mm where the roof has an upstand, kerb or wall — the membrane has to climb it as well as turn the edge. Between two widths, always take the larger: surplus trims off in seconds, a sheet 50mm short cannot be rescued.\u003c\/p\u003e\n\u003cp style=\"margin:18px 0\"\u003e\u003ca href=\"\/pages\/epdm-roof-kit-calculator\" style=\"display:inline-block;background:#E8590C;color:#ffffff;padding:13px 22px;border-radius:8px;font-weight:700;text-decoration:none\"\u003eWork out my size and price\u003c\/a\u003e \u003cspan style=\"font-size:14px;color:#6B7684;margin-left:8px\"\u003eHandles L-shaped and pitched roofs, skylight voids, adhesives and trims.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eSpecification\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:0 0 10px\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600;width:38%\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eEPDM (ethylene propylene diene monomer) synthetic rubber, single ply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eThickness\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003e1.5mm — approximately 25% thicker than the standard 1.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eColour\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eSlate grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eWidths available\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003e20 widths: 0.53, 1.03, 1.53, 2.03, 2.53, 3.05, 3.53, 4.04, 4.57, 5.05, 5.55, 6.10, 6.55, 7.07, 7.62, 8.05, 8.55, 9.15, 12.20 and 15.24m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eMaximum single sheet\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003e15.24m wide × 30.5m long — supplied in one piece, no site joining\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003ePrice basis\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003ePer square metre, identical rate across every width. VAT included.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eCertification\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eBBA certified, certificate no. 19\/5670. Fire performance tested to BS 476 and EN 13501. Certificates on request.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eLife expectancy\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eUp to 50 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eGuarantee\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eManufacturer product guarantee — ask us for the current terms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eTemperature range\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eRemains flexible from −40°C to +120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eStanding water\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eUnaffected by ponding water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eUV and ozone\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eStable — will not crack, peel, split or need re-coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eSuitable decks\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eOSB3, WBP plywood and other sound timber decking; more forgiving than 1.2mm over slightly uneven substrates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid #E6EAEF\"\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eRecommended fall\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eFlat and low-pitch roofs; minimum fall of 1:80 recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;font-weight:600\"\u003eFixing method\u003c\/td\u003e\n\u003ctd style=\"padding:10px\"\u003eFully bonded, cold applied — no heat or naked flame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eHow it compares\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/epdm-membrane-thickness-chooser.jpg?v=1786098044\" alt=\"Comparison of 1.0mm, 1.2mm and 1.5mm EPDM membrane thicknesses and what each is suited to\" width=\"1264\" height=\"848\" loading=\"lazy\" style=\"width:100%;height:auto;display:block;max-width:900px;margin:18px auto;border-radius:8px\"\u003e\n\n\u003ch2\u003eWhat else you will need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/epdm-water-based-deck-adhesive-high-strength-bonding-glue-for-rubber-roofing-membranes\"\u003eWater-based deck adhesive\u003c\/a\u003e for the field and \u003ca href=\"\/products\/epdm-rubber-roofing-contact-adhesive-high-strength-bonding-glue-for-timber-insulation-boards\"\u003econtact adhesive\u003c\/a\u003e for the perimeter and upstands — the \u003ca href=\"\/pages\/epdm-adhesives-primers-guide\"\u003eadhesives guide\u003c\/a\u003e covers which goes where and coverage rates\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/epdm-drip-gutter-edge-trim-2m-rubber-roof-uk\"\u003eDrip trim\u003c\/a\u003e for the gutter edge and \u003ca href=\"\/products\/epdm-kerb-edge-trim-2m-rubber-roof-uk\"\u003ekerb trim\u003c\/a\u003e elsewhere, with a moulded corner at every turn — see \u003ca href=\"\/collections\/flashing-and-trims\"\u003eall trims\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/epdm-lap-sealant-rubber-roof-uk\"\u003eLap sealant\u003c\/a\u003e for finishing bonded edges\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/walkway-pads\"\u003eWalkway pads\u003c\/a\u003e — worth it even on 1.5mm if the roof takes regular traffic\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/epdm-membrane-seam-tape-75mm-rubber-roof-uk\"\u003eSeam tape\u003c\/a\u003e and \u003ca href=\"\/products\/epdm-rubber-roof-primer-high-strength-bonding-primer-for-flashings-detail-work\"\u003eprimer\u003c\/a\u003e only if the roof exceeds a single sheet or you are joining to existing membrane\u003c\/li\u003e\n\u003cli\u003eAn \u003ca href=\"\/products\/epdm-pipe-flashing-boot-rubber-roof-uk\"\u003eEPDM pipe boot\u003c\/a\u003e for any flue, soil pipe or cable through the roof\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"border:2px solid #E8590C;border-radius:12px;background:#FDF4EC;padding:22px 24px;margin:26px 0\"\u003e\n\u003ch3 style=\"margin-top:0\"\u003eFree downloads — no email address needed\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 16px\"\u003eOur own installation manual and a one-page checklist for the roof.\u003c\/p\u003e\n\u003cp style=\"margin:0\"\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/rubber-roof-uk-epdm-installation-manual.pdf?v=1786057613\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#E8590C;color:#ffffff;padding:12px 20px;border-radius:8px;font-weight:700;text-decoration:none;margin:0 10px 10px 0\"\u003eInstallation Manual (PDF)\u003c\/a\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/rubber-roof-uk-install-day-checklist.pdf?v=1786057613\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#1F2933;color:#ffffff;padding:12px 20px;border-radius:8px;font-weight:700;text-decoration:none;margin:0 0 10px 0\"\u003eInstall-Day Checklist (PDF)\u003c\/a\u003e\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eDelivery, dispatch and returns\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree delivery\u003c\/strong\u003e to UK mainland addresses on every order, whatever the size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day dispatch\u003c\/strong\u003e on orders placed before 2pm on a working day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1–3 working days\u003c\/strong\u003e on a tracked courier once dispatched.\u003c\/li\u003e\n\u003cli\u003eMembrane is \u003cstrong\u003ecut to order\u003c\/strong\u003e, so once cut it cannot be returned. Uncut stock items can be returned within 30 days.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eIs 1.5mm more waterproof than 1.2mm?\u003c\/h3\u003e\n\u003cp\u003eNo, and we would rather be straight about it. Both are the same rubber and both are completely waterproof. The extra thickness buys resistance to punctures, tearing and foot traffic. Leaks come from poor bonding and poor detailing, never from the sheet being too thin.\u003c\/p\u003e\n\u003ch3\u003eHow much thicker is it, really?\u003c\/h3\u003e\n\u003cp\u003e1.5mm against 1.2mm is about 25% thicker. You can feel the difference handling it, and it is noticeably more forgiving over a slightly uneven deck.\u003c\/p\u003e\n\u003ch3\u003eWhen should I choose 1.5mm?\u003c\/h3\u003e\n\u003cp\u003eWhen the roof gets regular foot traffic — a terrace, balcony or roof garden — on commercial or large-span roofs, where pavers, ballast or decking sit on top, where there is impact risk from overhanging trees or ladders, on older or uneven decks, or when a specifier has asked for it by name.\u003c\/p\u003e\n\u003ch3\u003eWhen is 1.2mm enough?\u003c\/h3\u003e\n\u003cp\u003eFor the great majority of domestic roofs: extensions, garages, garden rooms, dormers and porches that are only walked on for maintenance. It is the standard UK specification and it costs less.\u003c\/p\u003e\n\u003ch3\u003eHow is the membrane priced?\u003c\/h3\u003e\n\u003cp\u003eBy the square metre, at the same rate for every width. Choose a width, set the quantity to the metres of length you need, and the price shown is what you pay — VAT included, delivery free, no cutting charge.\u003c\/p\u003e\n\u003ch3\u003eWhat size should I order?\u003c\/h3\u003e\n\u003cp\u003eYour deck size plus 150mm on each of the four sides. Take the next width up and round the length to whole metres. A 3.5m × 5m deck needs roughly 3.8m × 5.3m, so order the 4.04m width at 6 metres.\u003c\/p\u003e\n\u003ch3\u003eDo I need extra for upstands or a kerb?\u003c\/h3\u003e\n\u003cp\u003eYes. The 150mm allowance covers turning the edge. If the membrane must climb an upstand, kerb or wall, add that height on top on that side.\u003c\/p\u003e\n\u003ch3\u003eWill there be a join or seam?\u003c\/h3\u003e\n\u003cp\u003eNo. Every order is one continuous sheet at the size you specify, up to 15.24m wide and 30.5m long.\u003c\/p\u003e\n\u003ch3\u003eWhat is the largest single sheet you can supply?\u003c\/h3\u003e\n\u003cp\u003e15.24m wide by 30.5m long. Almost every roof, domestic or light commercial, comes in under that.\u003c\/p\u003e\n\u003ch3\u003eWhat colour is it?\u003c\/h3\u003e\n\u003cp\u003eSlate grey, the same as the 1.2mm. It weathers to a slightly matt finish rather than fading to another colour.\u003c\/p\u003e\n\u003ch3\u003eCan I lay pavers, decking or a green roof on top?\u003c\/h3\u003e\n\u003cp\u003eYes, and this is exactly where 1.5mm earns its price. Use a protection layer or walkway pads between the membrane and anything laid over it, and never let anything sharp bear directly on the rubber. Check the structure can take the load before you build up.\u003c\/p\u003e\n\u003ch3\u003eCan I use it on a roof terrace or balcony?\u003c\/h3\u003e\n\u003cp\u003eYes. For regular foot traffic, specify 1.5mm and add walkway pads or a proper deck build-up over the membrane rather than walking on the rubber itself.\u003c\/p\u003e\n\u003ch3\u003eWhat else do I need to buy?\u003c\/h3\u003e\n\u003cp\u003eAt minimum water-based deck adhesive for the field and contact adhesive for the perimeter and upstands. Most roofs also want edge trims with corners and lap sealant. Pipe boots, seam tape and primer only if you have penetrations or a join.\u003c\/p\u003e\n\u003ch3\u003eWhich adhesive goes where?\u003c\/h3\u003e\n\u003cp\u003eWater-based deck adhesive bonds the flat field — rollered on, membrane laid into it wet. Contact adhesive bonds anything vertical or at an edge: both faces, left until touch-dry, then it grabs instantly. Never swap them.\u003c\/p\u003e\n\u003ch3\u003eDoes the thicker membrane need more adhesive?\u003c\/h3\u003e\n\u003cp\u003eNo. Adhesive coverage is set by the area of deck, not the thickness of the sheet. A 5-litre tin of water-based deck adhesive still covers roughly 20 m².\u003c\/p\u003e\n\u003ch3\u003eIs it harder to install than 1.2mm?\u003c\/h3\u003e\n\u003cp\u003eMarginally. It is heavier to handle and a little stiffer to dress into corners, so it is worth having a second pair of hands on a large sheet. Everything else about the method is identical.\u003c\/p\u003e\n\u003ch3\u003eDo I need a primer?\u003c\/h3\u003e\n\u003cp\u003eNot for bonding to sound timber decking. Primer is for detail work — bonding tape, flashings or patches to the membrane surface.\u003c\/p\u003e\n\u003ch3\u003eCan it be laid over an existing felt roof?\u003c\/h3\u003e\n\u003cp\u003eSometimes, but stripping is better. Overlaying only works if the old felt is fully stuck down, flat, dry and free of mineral chippings.\u003c\/p\u003e\n\u003ch3\u003eWhat can it be bonded to?\u003c\/h3\u003e\n\u003cp\u003eSound timber decking — OSB3, WBP plywood or planed board. Concrete, metal and insulation boards are possible but need different preparation, so ask first.\u003c\/p\u003e\n\u003ch3\u003eDoes the roof still need a fall?\u003c\/h3\u003e\n\u003cp\u003eYes, a minimum of 1:80 towards the drainage edge, which is 25mm of drop per 2m of run. Thickness does not change that.\u003c\/p\u003e\n\u003ch3\u003eDoes it cope with ponding water?\u003c\/h3\u003e\n\u003cp\u003eYes, EPDM is unaffected by standing water at any of our thicknesses.\u003c\/p\u003e\n\u003ch3\u003eCan it be laid in cold or wet weather?\u003c\/h3\u003e\n\u003cp\u003eThe membrane is unaffected, but the adhesives are not. You need a dry deck, a dry day and 5°C or above, with no rain forecast until the adhesive has cured.\u003c\/p\u003e\n\u003ch3\u003eWhich side goes up?\u003c\/h3\u003e\n\u003cp\u003eMembrane of this type is the same on both sides. Keep the face that touches the deck clean and dust free.\u003c\/p\u003e\n\u003ch3\u003eHow do I join two pieces?\u003c\/h3\u003e\n\u003cp\u003eOverlap by 75mm, prime both faces of the overlap and join with seam tape rolled hard from the centre out. Plan the seam across the fall and never through a detail. The \u003ca href=\"\/pages\/how-to-install-epdm\"\u003einstallation guide\u003c\/a\u003e covers it step by step.\u003c\/p\u003e\n\u003ch3\u003eHow long does it last, and is it guaranteed?\u003c\/h3\u003e\n\u003cp\u003eA life expectancy of up to 50 years, with a manufacturer product guarantee — ask us for the current terms and we will send them with the certificates.\u003c\/p\u003e\n\u003ch3\u003eIs it certified?\u003c\/h3\u003e\n\u003cp\u003eYes — BBA certified under certificate no. 19\/5670 and fire-tested to BS 476 and EN 13501. We will send the paperwork if building control or an insurer asks for it.\u003c\/p\u003e\n\u003ch3\u003eCan I return it if I order the wrong size?\u003c\/h3\u003e\n\u003cp\u003eCut-to-size membrane cannot be returned once cut, which is why we would rather check your measurements first. Send us the dimensions and a photo before you order.\u003c\/p\u003e\n\u003ch3\u003eHow is it delivered?\u003c\/h3\u003e\n\u003cp\u003eRolled and wrapped on a tracked courier, free to UK mainland addresses. Order before 2pm on a working day for same-day dispatch, arriving in 1–3 working days. A large 1.5mm sheet is heavy — have someone available to help take it off the vehicle.\u003c\/p\u003e\n\n\u003ch2\u003eGuides that go with this membrane\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/epdm-thickness-guide\"\u003eThickness guide\u003c\/a\u003e — 1.0mm, 1.2mm and 1.5mm compared\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/how-to-install-epdm\"\u003eHow to install EPDM roofing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/epdm-adhesives-primers-guide\"\u003eAdhesives and primers guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/how-to-fit-epdm-roof-trims\"\u003eFitting edge trims\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/epdm-learning-centre\"\u003eThe full EPDM Learning Centre\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is 1.5mm EPDM more waterproof than 1.2mm?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Both are the same rubber and both are completely waterproof. The extra thickness buys resistance to punctures, tearing and foot traffic. Leaks come from poor bonding and detailing, not from sheet thickness.\"}},{\"@type\":\"Question\",\"name\":\"How much thicker is 1.5mm EPDM than 1.2mm?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"About 25% thicker. You can feel it handling the sheet, and it is more forgiving over a slightly uneven deck.\"}},{\"@type\":\"Question\",\"name\":\"When should I choose 1.5mm EPDM membrane?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"When the roof gets regular foot traffic such as a terrace or balcony, on commercial or large-span roofs, where pavers, ballast or decking sit on top, where there is impact risk, on older or uneven decks, or when a specifier asks for it.\"}},{\"@type\":\"Question\",\"name\":\"When is 1.2mm EPDM enough?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For most domestic roofs: extensions, garages, garden rooms, dormers and porches that are only walked on for maintenance. It is the standard UK specification and costs less.\"}},{\"@type\":\"Question\",\"name\":\"How is cut-to-size EPDM membrane priced?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"By the square metre at the same rate for every width. Choose a width, set the quantity to the metres of length required, and the price shown is what you pay, VAT included with free delivery and no cutting charge.\"}},{\"@type\":\"Question\",\"name\":\"What size EPDM membrane should I order?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Your deck size plus 150mm on each of the four sides. Take the next width up and round the length to whole metres. A 3.5m by 5m deck needs about 3.8m by 5.3m, so order the 4.04m width at 6 metres.\"}},{\"@type\":\"Question\",\"name\":\"Do I need extra membrane for upstands or a kerb?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The 150mm allowance covers turning the edge. If the membrane must climb an upstand, kerb or wall, add that height on top on that side.\"}},{\"@type\":\"Question\",\"name\":\"Will 1.5mm EPDM membrane have a join?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Every order is one continuous sheet at the size specified, up to 15.24m wide and 30.5m long.\"}},{\"@type\":\"Question\",\"name\":\"What is the largest single sheet of 1.5mm EPDM?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"15.24m wide by 30.5m long. Almost every domestic and light commercial roof comes in under that.\"}},{\"@type\":\"Question\",\"name\":\"What colour is 1.5mm EPDM membrane?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Slate grey, the same as the 1.2mm. It weathers to a slightly matt finish rather than fading to another colour.\"}},{\"@type\":\"Question\",\"name\":\"Can I lay pavers, decking or a green roof over EPDM?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, and this is where 1.5mm earns its price. Use a protection layer or walkway pads between the membrane and anything laid over it, and check the structure can take the load.\"}},{\"@type\":\"Question\",\"name\":\"Can EPDM be used on a roof terrace or balcony?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. For regular foot traffic specify 1.5mm and add walkway pads or a deck build-up over the membrane rather than walking on the rubber itself.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need to buy with EPDM membrane?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"At minimum water-based deck adhesive for the field and contact adhesive for the perimeter and upstands. Most roofs also want edge trims with corners and lap sealant.\"}},{\"@type\":\"Question\",\"name\":\"Which EPDM adhesive goes where?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Water-based deck adhesive bonds the flat field with the membrane laid into it wet. Contact adhesive bonds anything vertical or at an edge, applied to both faces and left until touch-dry.\"}},{\"@type\":\"Question\",\"name\":\"Does thicker EPDM need more adhesive?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Adhesive coverage is set by the area of deck, not sheet thickness. A 5-litre tin of water-based deck adhesive still covers roughly 20 square metres.\"}},{\"@type\":\"Question\",\"name\":\"Is 1.5mm EPDM harder to install than 1.2mm?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Marginally. It is heavier and slightly stiffer to dress into corners, so have a second person for a large sheet. The method is otherwise identical.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a primer for EPDM on timber decking?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Primer is for detail work such as bonding tape, flashings or patches to the membrane surface.\"}},{\"@type\":\"Question\",\"name\":\"Can 1.5mm EPDM be laid over an existing felt roof?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sometimes, but stripping is better. Overlaying only works if the old felt is fully bonded, flat, dry and free of mineral chippings.\"}},{\"@type\":\"Question\",\"name\":\"What surfaces can 1.5mm EPDM be bonded to?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sound timber decking such as OSB3, WBP plywood or planed board. Concrete, metal and insulation boards are possible but need different preparation.\"}},{\"@type\":\"Question\",\"name\":\"Does a 1.5mm EPDM roof still need a fall?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a minimum of 1:80 towards the drainage edge, which is 25mm of drop per 2m of run. Thickness does not change that.\"}},{\"@type\":\"Question\",\"name\":\"Does 1.5mm EPDM cope with ponding water?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, EPDM is unaffected by standing water at any thickness.\"}},{\"@type\":\"Question\",\"name\":\"Can EPDM be laid in cold or wet weather?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The membrane is unaffected but the adhesives are not. You need a dry deck, a dry day and 5 degrees Celsius or above with no rain forecast until the adhesive cures.\"}},{\"@type\":\"Question\",\"name\":\"Which side of the membrane goes up?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Membrane of this type is the same on both sides. Keep the face that touches the deck clean and dust free.\"}},{\"@type\":\"Question\",\"name\":\"How do you join two pieces of EPDM membrane?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Overlap by 75mm, prime both faces of the overlap and join with seam tape rolled hard from the centre outwards. Plan the seam across the fall and never through a detail.\"}},{\"@type\":\"Question\",\"name\":\"How long does 1.5mm EPDM last and is it guaranteed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A life expectancy of up to 50 years with a manufacturer product guarantee. Ask us for the current terms and we will send them with the certificates.\"}},{\"@type\":\"Question\",\"name\":\"Is 1.5mm EPDM membrane BBA certified?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, BBA certified under certificate number 19\/5670 and fire-tested to BS 476 and EN 13501. Paperwork is available for building control or insurers.\"}},{\"@type\":\"Question\",\"name\":\"Can I return cut-to-size EPDM membrane?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Cut-to-size membrane cannot be returned once cut, so we would rather check your measurements first. Send dimensions and a photo before ordering.\"}},{\"@type\":\"Question\",\"name\":\"How is 1.5mm EPDM membrane delivered?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Rolled and wrapped on a tracked courier, free to UK mainland addresses. Order before 2pm on a working day for same-day dispatch, arriving in 1 to 3 working days. A large 1.5mm sheet is heavy, so have help available to unload.\"}}]}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"HowTo\",\"name\":\"How to measure and order 1.5mm EPDM membrane cut to size\",\"description\":\"Working out the right width and length of heavy-duty 1.5mm EPDM rubber roofing membrane to order, including the 150mm edge allowance.\",\"totalTime\":\"PT15M\",\"tool\":[{\"@type\":\"HowToTool\",\"name\":\"Tape measure\"}],\"step\":[{\"@type\":\"HowToStep\",\"position\":1,\"name\":\"Measure the roof deck\",\"text\":\"Measure the length and width of the deck at its widest points. On a sloping roof measure along the slope rather than the plan.\"},{\"@type\":\"HowToStep\",\"position\":2,\"name\":\"Add 150mm to every side\",\"text\":\"Add 150mm to each of the four sides so the membrane can dress over the edges, plus the full height of any upstand, kerb or wall on that side.\"},{\"@type\":\"HowToStep\",\"position\":3,\"name\":\"Take the next width up\",\"text\":\"Pick the next width up from the 20 stock widths. Between sizes always take the larger, because surplus trims off but a short sheet cannot be rescued.\"},{\"@type\":\"HowToStep\",\"position\":4,\"name\":\"Set the length in whole metres\",\"text\":\"Set the quantity to the metres of length required, rounded up to whole metres. The price is the area multiplied by the per square metre rate.\"}]}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Rubber Roof UK","offers":[{"title":"0.53m","offer_id":45207280812223,"sku":"RRUK-MEM15-W053","price":18.54,"currency_code":"GBP","in_stock":true},{"title":"1.03m","offer_id":45207280844991,"sku":"RRUK-MEM15-W103","price":36.02,"currency_code":"GBP","in_stock":true},{"title":"1.53m","offer_id":45207280877759,"sku":"RRUK-MEM15-W153","price":53.51,"currency_code":"GBP","in_stock":true},{"title":"2.03m","offer_id":45207280910527,"sku":"RRUK-MEM15-W203","price":71.0,"currency_code":"GBP","in_stock":true},{"title":"2.53m","offer_id":45207280943295,"sku":"RRUK-MEM15-W253","price":88.49,"currency_code":"GBP","in_stock":true},{"title":"3.05m","offer_id":45207280976063,"sku":"RRUK-MEM15-W305","price":106.67,"currency_code":"GBP","in_stock":true},{"title":"3.53m","offer_id":45207281008831,"sku":"RRUK-MEM15-W353","price":123.46,"currency_code":"GBP","in_stock":true},{"title":"4.04m","offer_id":45207281041599,"sku":"RRUK-MEM15-W404","price":141.3,"currency_code":"GBP","in_stock":true},{"title":"4.57m","offer_id":45207281074367,"sku":"RRUK-MEM15-W457","price":159.84,"currency_code":"GBP","in_stock":true},{"title":"5.05m","offer_id":45207281107135,"sku":"RRUK-MEM15-W505","price":176.62,"currency_code":"GBP","in_stock":true},{"title":"5.55m","offer_id":45207281139903,"sku":"RRUK-MEM15-W555","price":194.11,"currency_code":"GBP","in_stock":true},{"title":"6.10m","offer_id":45207281172671,"sku":"RRUK-MEM15-W610","price":213.35,"currency_code":"GBP","in_stock":true},{"title":"6.55m","offer_id":45207281205439,"sku":"RRUK-MEM15-W655","price":229.09,"currency_code":"GBP","in_stock":true},{"title":"7.07m","offer_id":45207281238207,"sku":"RRUK-MEM15-W707","price":247.27,"currency_code":"GBP","in_stock":true},{"title":"7.62m","offer_id":45207281270975,"sku":"RRUK-MEM15-W762","price":266.51,"currency_code":"GBP","in_stock":true},{"title":"8.05m","offer_id":45207281303743,"sku":"RRUK-MEM15-W805","price":281.55,"currency_code":"GBP","in_stock":true},{"title":"8.55m","offer_id":45207281336511,"sku":"RRUK-MEM15-W855","price":299.04,"currency_code":"GBP","in_stock":true},{"title":"9.15m","offer_id":45207281369279,"sku":"RRUK-MEM15-W915","price":320.02,"currency_code":"GBP","in_stock":true},{"title":"12.20m","offer_id":45340342223039,"sku":"RRUK-MEM15-W1220","price":426.7,"currency_code":"GBP","in_stock":true},{"title":"15.24m","offer_id":45340342255807,"sku":"RRUK-MEM15-W1524","price":533.02,"currency_code":"GBP","in_stock":true},{"title":"Cut to size — per m²","offer_id":45949952196799,"sku":"RRUK-MEM15-M2","price":34.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/roofer-rolling-1-5mm-heavy-duty-epdm-commercial-roof-pressure-roller.png?v=1779800361","url":"https:\/\/rubberroofuk.uk\/products\/1-5mm-epdm-rubber-roofing-membrane","provider":"Rubber Roof UK","version":"1.0","type":"link"}