{"product_id":"complete-grp-fibreglass-roofing-kit-with-tools-450g","title":"Complete GRP Fibreglass Roofing Kit with Tools – 450g Flat Roof System, 5m² to 30m²","description":"\u003cp\u003eEPDM rubber isn't the only way to waterproof a flat roof — GRP fibreglass is the other system UK roofers reach for, and some jobs simply suit it better: roofs with lots of foot traffic, complex details and corners, or owners who want a hard, seamless, walk-on surface with a crisp trimmed edge.\u003c\/p\u003e\n\u003cp\u003eThis kit gives you the complete GRP system for a new deck, sized by roof area, with the tools included — resin, topcoat, catalyst, matting, tape, rollers, brushes and buckets in one box.\u003c\/p\u003e\n\n\u003ch2\u003eKey benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eComplete system in one kit — 450g fibreglass matting, base resin, grey topcoat, catalyst, woven tape, laminating and paddle rollers, brushes, buckets and gloves\u003c\/li\u003e\n\u003cli\u003eCures to a hard, seamless, fully walkable waterproof surface with no joints or seams\u003c\/li\u003e\n\u003cli\u003eCold-applied — no torches or hot works on the roof\u003c\/li\u003e\n\u003cli\u003eSix kit sizes, matched to your roof area from a 5m² porch to a 30m² garage roof\u003c\/li\u003e\n\u003cli\u003eThe proven GRP wet-lay system used across UK domestic flat roofing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSuitable applications\u003c\/h3\u003e\n\u003cp\u003eNew flat roof decks on garages, extensions, porches, sheds, garden rooms, dormers and balconies — anywhere you're boarding a new deck (GRP is laid onto new OSB3, not over old felt) and want a hard-wearing seamless finish.\u003c\/p\u003e\n\u003cp\u003ePrefer a rubber membrane instead?\u003c\/p\u003e\n\u003cp\u003eOur \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/complete-epdm-flat-rubber-roof-kit-durable-waterproof-membrane-roofing-system-for-sheds-garages-extensions\"\u003eComplete EPDM Flat Rubber Roof Kit\u003c\/a\u003e covers the same roofs with a one-piece EPDM membrane — GRP suits heavy foot traffic and complex detail; EPDM suits speed, flexibility and larger single sheets.\u003c\/p\u003e\n\u003cp\u003eIf your roof sits close to a boundary or needs a fire-rated covering under Building Regulations, see our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/fire-rated-grp-fibreglass-roofing-kit-with-tools-broof-t4\"\u003eFire-Rated GRP Roofing Kit (BROOF(t4))\u003c\/a\u003e — the same sizes and process, with a fire-rated resin and topcoat.\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eKit size\u003c\/th\u003e\n\u003cth\u003eCovers\u003c\/th\u003e\n\u003cth\u003eMatting\u003c\/th\u003e\n\u003cth\u003eTopcoat colour\u003c\/th\u003e\n\u003cth\u003eTools included\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e5m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 5m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 10m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 15m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 20m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 25m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e30m² kit\u003c\/td\u003e\n\u003ctd\u003eUp to 30m²\u003c\/td\u003e\n\u003ctd\u003e450g CSM\u003c\/td\u003e\n\u003ctd\u003eGrey\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size:0.9em;color:#555;\"\u003eEach kit contains base resin, grey GRP topcoat, catalyst (MEKP), 450g chopped strand matting, 50mm woven tape, laminating and paddle rollers, brushes, mixing buckets, gloves and an installation guide.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation \u0026amp; ordering guidance\u003c\/h3\u003e\n\u003cp\u003eMeasure your roof deck area in m² and order the kit size at or above it — if you're between sizes, size up, since detail work around edges and upstands uses more material than the flat field.\u003c\/p\u003e\n\u003cp\u003eGRP is laid onto a clean, dry, new OSB3 deck in dry weather above roughly 5°C: catalysed resin wets out the matting, cures within the hour, and the pigmented topcoat seals and finishes the surface.\u003c\/p\u003e\n\u003cp\u003eTo finish the perimeter properly, add our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/grp-roof-edge-trim-perimeter-packs\"\u003eGRP roof edge trim perimeter packs\u003c\/a\u003e — the laminate is taken out over the trim's fixing arm and sealed in, giving a straight, weathertight edge in black, grey or white.\u003c\/p\u003e\n\u003cp\u003eFor the tools you'll reuse on any roofing job, see our \u003ca href=\"https:\/\/rubberroofuk.uk\/products\/epdm-professional-installation-kit-rubber-roof-uk\"\u003eProfessional Installation Kit\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGRP or EPDM — which should I choose?\u003c\/strong\u003e\u003cbr\u003eBoth waterproof a flat roof for decades.\u003c\/p\u003e\n\u003cp\u003eGRP gives a hard, seamless walk-on surface that shrugs off ladders and foot traffic and excels at fiddly details; EPDM goes down faster in one flexible sheet and tolerates structural movement better.\u003c\/p\u003e\n\u003cp\u003eIf you're unsure, our team can advise against your actual roof.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I lay this over my old felt roof?\u003c\/strong\u003e\u003cbr\u003eNo — GRP needs a new, dry OSB3 deck to bond to.\u003c\/p\u003e\n\u003cp\u003eIf you're overlaying an existing covered roof, an EPDM system or a liquid coating is usually the better route.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much time do I have once the resin is mixed?\u003c\/strong\u003e\u003cbr\u003eWorking time is typically 20–30 minutes per mix depending on temperature — mix in batches you can use immediately rather than catalysing the whole tin.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich kit size do I need?\u003c\/strong\u003e\u003cbr\u003eMatch the kit to your measured deck area and round up — e.g. a 3.5m × 5m garage (17.5m²) takes the 20m² kit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is it delivered?\u003c\/strong\u003e\u003cbr\u003eAs a multi-box kit on a courier or pallet service depending on size; resins are date-sensitive, so order close to your planned installation and store cool until use.\u003c\/p\u003e\n","brand":"Rubber Roof UK","offers":[{"title":"5m²","offer_id":45996167266495,"sku":"RRUK-GRP-5M2","price":449.99,"currency_code":"GBP","in_stock":true},{"title":"10m²","offer_id":45996167299263,"sku":"RRUK-GRP-10M2","price":644.99,"currency_code":"GBP","in_stock":true},{"title":"15m²","offer_id":45996167332031,"sku":"RRUK-GRP-15M2","price":699.99,"currency_code":"GBP","in_stock":true},{"title":"20m²","offer_id":45996167364799,"sku":"RRUK-GRP-20M2","price":969.99,"currency_code":"GBP","in_stock":true},{"title":"25m²","offer_id":45996167397567,"sku":"RRUK-GRP-25M2","price":1144.99,"currency_code":"GBP","in_stock":true},{"title":"30m²","offer_id":45996167430335,"sku":"RRUK-GRP-30M2","price":1164.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0598\/1804\/9727\/files\/c0s5cbulRCLPDCgiiUnnN7l5anleaShZ0ATfQSadxxA1PNqnsFOfG6qYYWsVFvhOAfy83WLgjkiK5wT02VA34_jGMm1P2OfabtCL1u5ycOqDYnHLYfp2jvnp0xKYmOYfznkhzC61_E9EJ8_xiU5dKDd9DboX-BNPOysw-jvkR4U.jpg?v=1786366588","url":"https:\/\/rubberroofuk.uk\/products\/complete-grp-fibreglass-roofing-kit-with-tools-450g","provider":"Rubber Roof UK","version":"1.0","type":"link"}