EPDM (rubber) is our default for larger flat roofs — single-sheet installs, no field seams, and a service life that comfortably outlives mineral felt.
Single-storey rear extensions, garages, larger flat areas where one continuous sheet avoids seams.
We use 1.2 or 1.5 mm Firestone-grade EPDM with proper kerbs, drip trims and warm-roof insulation — not the thin glue-and-go kits.
Keep an EPDM roof clear at its outlets, inspect the perimeter trims and upstands, and look for standing water or changes in the deck. The membrane itself needs little attention; most avoidable trouble starts at drainage points, edges, penetrations or beneath the covering.
There is no single best flat roof system — there is a best system for a particular deck, shape and use. Here is how the three common options actually differ.
Felt is cheapest and lasts 10 to 20 years. EPDM rubber is seamless on most domestic roofs and lasts 20 to 25. GRP fibreglass is the toughest underfoot at 20 to 30 years but costs more and dislikes a flexing deck. The deck and the detailing decide the outcome more than the brand.
