What is the best type of flat roof?
There is no single best flat-roof material for every property. EPDM, GRP, modern felt and other membrane systems can all perform well when correctly specified and installed. The best choice depends on roof size, detailing, expected movement, foot traffic, drainage, appearance, budget and installer experience.
Matching the system to the roof
There is no single best flat roof system. The right choice depends on the size and shape of the roof, the falls and outlets, the detailing around upstands and rooflights, foot traffic, and how visible the finish is.
Deck condition matters too — any system laid over a deteriorating deck will fail early regardless of its own qualities.
Questions worth asking
Ask how falls will be achieved, how upstands and outlets will be formed, and what preparation the existing deck needs. Those answers tell you more about the outcome than the name of the membrane.
Ask also what the system's maintenance expectations are, because they differ between materials.