Flat roofing in Merthyr Tydfil

On houses, the three you will see are EPDM rubber (a single sheet of synthetic rubber), GRP fibreglass (resin and glass mat laid wet, which sets hard) and built-up felt (layers of bitumen felt, often torched on). Liquid coatings and single-ply PVC are used too, mostly on commercial roofs.

Rubber feels soft and slightly stretchy, usually black and smooth, with metal or plastic trims at the edges. GRP is hard and glossy, often grey, like a boat hull. Felt is rough and gritty, often with mineral chippings on top, and you may see overlapping strips. If you are not sure, a photo with your quote request helps the roofer.

Yes. It is one of the best choices for extensions, garages and dormers: it copes with frost and sun, has few or no joints, and lasts 20–30 years or more when it is fitted well. Most EPDM failures come from poor edge detailing, not the rubber.

It can be punctured by sharp objects or careless foot traffic, it is usually black, and it relies on good glue and trims at the edges. Overlaying it on an old felt roof is not recommended. It also costs a little more than felt.

DIY kits are sold for sheds, but on a house the deck, insulation, upstands and edges have to be right or water gets in, and working at height brings its own risks. Most insurers and guarantees expect a professional installation on a home.

A coating only works on a sound, dry roof: it will not fix a wet or rotten deck, and trapped moisture can blister it. It needs a very clean surface to stick, some coatings cannot be painted over later, and a cheap coating may last only a few years. Treat it as a repair or life-extender, not a new roof.

EPDM can be fitted in cold weather as long as the deck is dry. GRP needs dry, mild conditions to cure properly, so winter jobs may be delayed.