--- title: "Flat Roof Materials Compared: EPDM vs GRP vs Felt" description: "Comparing EPDM rubber, GRP fibreglass and traditional felt for County Durham flat roofs — cost, lifespan and performance compared in plain English." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "BlogPosting", "headline": "Flat Roof Materials Compared: EPDM, GRP & Felt", "description": "Comparing EPDM rubber, GRP fibreglass and traditional felt for County Durham flat roofs — cost, lifespan and performance compared in plain English.", "datePublished": "2026-02-14", "url": "https://weathershieldroofer.co.uk/blog/flat-roof-materials-compared", "author": { "@type": "Organization", "name": "Weather Shield Roofing", "url": "https://weathershieldroofer.co.uk" }, "publisher": { "@type": "Organization", "name": "Weather Shield Roofing", "url": "https://weathershieldroofer.co.uk" }, "mainEntityOfPage": { "@type": "WebPage", "@id": "https://weathershieldroofer.co.uk/blog/flat-roof-materials-compared" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://weathershieldroofer.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Blog", "item": "https://weathershieldroofer.co.uk/blog" }, { "@type": "ListItem", "position": 3, "name": "Flat Roof Materials Compared: EPDM, GRP & Felt" } ] } ] --- [![Weather Shield Roofing](/assets/logo-Dpcxk7C4.png)](/) [Home](/) Services Areas We Cover [About](/about)[Our Work](/our-work)[Reviews](/reviews)[Blog](/blog)[Contact](/contact) [07427 846158](tel:07427846158)[or 07843 741505](tel:07843741505) [Get a Free Quote](/contact) 1. [Home](/) 2. [Blog](/blog) 3. Flat Roof Materials Compared: EPDM, GRP & Felt [Back to Blog](/blog)Flat Roofs # Flat Roof Materials Compared: EPDM, GRP & Felt 14 February 2026 7 min read If you're planning a [flat roof](/flat-roofs) installation or replacement in County Durham, the material you choose will determine how long it lasts, how well it handles our North East weather, and how much it costs. Here's an honest comparison of the three most popular options. ## Traditional Felt (Built-Up Roofing) Felt has been the go-to flat roofing material for decades. Modern torch-on felt systems are a significant improvement over the old pour-and-roll methods, but they still have limitations. - **Lifespan:** 10–20 years with good installation - **Cost:** Lowest upfront cost of the three options - **Pros:** Affordable, proven technology, easy to repair - **Cons:** Shorter lifespan, can blister and crack in temperature extremes, vulnerable to standing water Felt works well for garden buildings, smaller extensions, and budget-conscious projects where you may re-roof in 15 years anyway. ## EPDM Rubber EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane that's become increasingly popular for domestic flat roofs. It's supplied in large single sheets, which means fewer joints and fewer potential leak points. - **Lifespan:** 25–40 years - **Cost:** Mid-range - **Pros:** Excellent flexibility (handles building movement well), UV resistant, handles ponding water, very low maintenance - **Cons:** Can look less finished than GRP, requires careful installation at edges and upstands EPDM is our most recommended option for most domestic flat roofs in [Durham](/areas/durham) and surrounding areas. It handles the North East's freeze-thaw cycles exceptionally well. ## GRP Fibreglass GRP (glass reinforced polyester) creates a seamless, hard-wearing surface that's applied in liquid form and cures to a rigid finish. It's the premium option for flat roofing. - **Lifespan:** 30–50 years - **Cost:** Highest upfront cost - **Pros:** Extremely durable, completely seamless, can be walked on, available in colours, excellent for balconies and walkways - **Cons:** Rigid (can crack on timber decks that move), must be installed in dry conditions above 5°C, highest cost GRP is ideal for areas that will be walked on regularly, or where you want a premium, long-lasting finish. It's particularly good for dormer roofs and balcony areas. ## Which Should You Choose? The right choice depends on your property, your budget, and how long you plan to stay. For most County Durham homeowners, **EPDM offers the best balance** of cost, longevity, and performance in our climate. Not sure which option suits your property? [Contact us](/contact) for a free assessment and we'll recommend the best system for your specific situation. ## Need Professional Roofing Help? 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