A flat-roof system matched to the job
Clear system comparison
We explain how EPDM and GRP differ in flexibility, finish and detailing.
Deck prepared properly
We check the substrate before covering it, rather than trapping faults beneath.
Drainage considered first
We review falls and outlets so rain has a practical route off the roof.
EPDM and GRP explained without the fog
EPDM uses a flexible rubber membrane, while GRP forms a rigid fibreglass finish. Both can protect suitable flat roofs, but the better choice depends on the roof rather than the name on the tin. We look at its size, shape, expected foot traffic and the number of outlets, upstands and penetrations. EPDM can suit broad areas and accommodate movement through its flexible membrane. GRP creates a seamless, firm finish that works well where the deck and detailing are prepared for it. We explain the practical difference before a system is selected.
A flat roof is only as sound as its details
The deck must be stable, even and suitable for the chosen covering. We also check that falls guide rain towards working outlets, because a new membrane cannot correct poor drainage by itself. Corners, rooflights, adjoining walls and perimeter trims need system-specific details to stop water finding a route below the surface. We install EPDM and GRP on suitable homes, commercial buildings, extensions and garages. Each roof is assessed on its own construction and condition before preparation begins.
Frequently asked questions
Is EPDM better than GRP for a flat roof?
Neither system is automatically better. EPDM is flexible, while GRP forms a rigid fibreglass surface. Roof shape, deck condition, movement, outlets and the required finish help us decide which system is more suitable.
Can a new flat roof go over the existing covering?
That depends on the existing build-up and condition. We need a sound, compatible base with correct falls and no trapped defects. If the old covering or deck has failed, stripping it back may be the sensible route.
What causes leaks around flat-roof edges and outlets?
These areas handle changes in direction and concentrated water flow. Failed trims, poor bonding, blocked outlets or weak corner details can let water beneath the membrane. We form them as part of the complete system.