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When choosing a flat roofing system, the debate often comes down to GRP (fibreglass) vs EPDM roofing. Both are widely used in the UK and offer durable, waterproof solutions—but which is better for your project?
In this guide, we compare fibreglass roofing vs EPDM rubber roofing across performance, cost, lifespan, and installation—so you can make an informed decision.
GRP roofing (Glass Reinforced Polyester) is a seamless flat roofing system made from polyester resin and glass fibre reinforcement. Once installed, it creates a strong, rigid, and completely waterproof surface.
GRP is typically applied over OSB3 decking, then finished with a protective topcoat (gel coat) for durability and UV resistance.
According to UK standards (BS 6229 & BS 8217), flat roofs should have a minimum fall of 1:40 to ensure proper drainage—making correct installation critical.
EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane used in single-ply roofing systems. It is supplied in large sheets and adhered to the roof deck using specialised adhesives.
EPDM is known for its flexibility, fast installation, and affordability.
Winner: Depends on installer experience
Winner: GRP
Winner: GRP
Winner: GRP
Winner: GRP
Winner: GRP
Winner: GRP
Winner: GRP
Winner: EPDM (short-term), GRP (long-term value)
Choose GRP fibreglass roofing if you want:
Choose EPDM roofing if you want:
While GRP and EPDM dominate modern flat roofing, other options include:
However, GRP and EPDM remain the most popular choices in the UK due to their performance, longevity, and cost-effectiveness.
GRP is a rigid, seamless fibreglass system, while EPDM is a flexible rubber membrane installed in sheets.
GRP typically has a longer lifespan due to its strong laminate structure.
In terms of durability, strength, and longevity, GRP often outperforms EPDM.
Yes, EPDM has a lower upfront cost, but GRP provides better value over time.
Limited foot traffic is possible, but it is more prone to punctures than GRP.
Choosing between GRP vs EPDM roofing depends on your priorities.
If you’re planning a flat roof and want maximum longevity with minimal maintenance, GRP is often the better investment.
If you’re deciding between GRP vs EPDM roofing, understanding your project requirements is key. For long-term performance and strength, GRP often stands out as the superior choice—while EPDM remains a strong budget-friendly option.
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