Flat roofs on extensions, garages, dormers and bays take more punishment than pitched roofs: standing water, UV and temperature swings all take their toll on older felt.
We repair flat roofs where it makes sense and replace them with a modern system when it doesn't, choosing between EPDM rubber, GRP fibreglass and torch-on felt to suit the roof and your budget.
What’s included
- EPDM single-ply rubber roofs
- GRP fibreglass roofs
- Torch-on and built-up felt systems
- New decking (OSB3 or ply) and insulation
- Warm-roof upgrades
- Trims, upstands and outlets
- Ponding and drainage problems
- Garage, extension, dormer and bay roofs
EPDM, GRP or felt?
EPDM is a single sheet of synthetic rubber: few joints, flexible and quick to install. GRP is a fibreglass laminate that cures into a hard, seamless finish, good for roofs with foot traffic or lots of detailing. Modern torch-on felt is a multi-layer system that's cost-effective and well proven. Our flat roof options guide goes into more detail.
Getting the falls right
Most flat roof failures come back to water that can't drain. When we replace a flat roof we check the falls and add firrings or tapered insulation where needed so water runs off rather than sitting.
Common questions
Can you go over my old felt roof?
Sometimes, but often it's better to strip back so we can check the deck underneath. Overlaying a wet or rotten deck just traps the problem.
Which flat roof lasts longest?
Well-installed EPDM and GRP generally outlast traditional felt, but the quality of installation and drainage matters as much as the material.
