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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.
Key Benefits of GRP Roofing
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.
Key Benefits of EPDM Roofing
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)
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 generally lasts longer due to its strong, bonded laminate structure.
For durability, strength, and lifespan, GRP is often the superior option.
Yes, EPDM has lower upfront costs, but GRP often delivers better long-term value.
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.
|
Feature
|
GRP Fibreglass Roofing
|
EPDM Rubber Roofing
|
|---|---|---|
|
Expected Lifespan
|
25-40+ years
|
15-25 years
|
|
Construction
|
Seamless laminate
|
Single-ply sheeted membrane
|
|
Foot Traffic
|
Suitabe
|
Not recommended
|
|
Puncture Resistance
|
Very high
|
Moderate to low
|
|
Leak Detection
|
Localised and visible
|
Difficult to detect
|
|
Repairability
|
Simple and permanent
|
More complex
|
|
Upfront Cost
|
Higher
|
Lower
|
|
Lifetime Cost
|
Lower Overall
|
Higher Over Time
|
Still unsure which system is right for you?
Contact our team today for expert advice, product recommendations, and competitive pricing on GRP and EPDM roofing systems.
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