How Long Should a Flat Roof Last? EPDM vs Felt vs GRP

Traditional built-up felt lasts 10-15 years. GRP fibreglass gives you 25-30 years. EPDM rubber, when installed properly, can last 40 years or more.

For most South Wales homeowners we recommend EPDM: it handles heavy rain, doesn't degrade in UV, and comes with a manufacturer-backed guarantee. Felt is still the cheapest upfront but you'll likely replace it twice in the life of an EPDM roof.