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Choosing the Right Flat Roof SystemFlat roofs are common on UK extensions, garages, and dormer windows. When it is time to replace yours, three main systems dominate the market.EPDM RubberA single-piece rubber membrane that lasts 30-50 years. No seams means no weak points. Typica...
Key Information
- Last Updated:
- 21 Apr 2026
- Category:
- Flat Roofs
- Reading Time:
- 1 min read
Choosing the Right Flat Roof System
Flat roofs are common on UK extensions, garages, and dormer windows. When it is time to replace yours, three main systems dominate the market.
EPDM Rubber
A single-piece rubber membrane that lasts 30-50 years. No seams means no weak points. Typical cost: £60-£80 per square metre installed. The most popular choice for UK homeowners.
GRP Fibreglass
A hard, seamless finish that is extremely durable. Best for roofs that need to be walked on (roof terraces). Typical cost: £70-£100 per square metre. Requires a specialist installer.
Traditional Felt
The cheapest option at £40-£55 per square metre, but the shortest lifespan (10-15 years). Still common on garages and small outbuildings where budget is the priority.
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I recently had GRP fibreglass installed on my terrace in Manchester. It's held up brilliantly against the city's rain – no leaks after two years!
I'm intrigued by the lifespan of EPDM roofs - could you elaborate on how these can last up to 50 years under UK conditions?
Just had EPDM installed on my Manchester garage by a local roofer. Cost was right in the quoted range and looks like it'll last.
I've just had my garage roof replaced with EPDM - it's been brilliant so far! Does anyone know how long it takes to properly cure and become fully waterproof?