EPDM (a single-ply rubber membrane) and GRP (glass-reinforced plastic, or fibreglass) are the two flat-roof systems we fit most often in Brighton, and both comfortably outlast the felt they usually replace. The right choice comes down to the roof's size, whether it is walked on, and how exposed it is to the coast.
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For most Brighton flat roofs, EPDM rubber is the better all-rounder — flexible, UV-stable and forgiving on larger or exposed roofs. GRP fibreglass wins where the roof is small, walked on, or wants a hard, seamless finish. Both far outlast old felt.
EPDM (a single-ply rubber membrane) and GRP (glass-reinforced plastic, or fibreglass) are the two flat-roof systems we fit most often in Brighton, and both comfortably outlast the felt they usually replace. The right choice comes down to the roof's size, whether it is walked on, and how exposed it is to the coast.
Neither is simply ‘better’ — each wins in different situations, and the table below sets the two side by side before we get into detail and what each means for a Brighton roof specifically.
| Aspect | EPDM | GRP |
|---|---|---|
| Typical lifespan | 25–40+ years | 20–30 years |
| Installed cost (indicative) | £80–£110/m² | £90–£120/m² |
| Finish | Matte black rubber membrane | Hard seamless laminate, any colour topcoat |
| Flexibility | Excellent — stays flexible in cold | Rigid — can craze on large flexing spans |
| Foot traffic | Fine occasionally; not a terrace surface | Very hard-wearing — good for roof terraces |
| Joints | Seamless on smaller roofs; bonded seams on larger | Fully seamless once cured |
| Install | Cold-applied, no flame | Wet lay-up, needs dry, warmer weather |
| Repairs | Simple patch/bond | Grind and re-laminate — more involved |
EPDM is a flexible rubber sheet bonded to the deck. It handles thermal movement without cracking, shrugs off UV and ozone, and on a modest roof can go down as a single seamless piece. It is cold-applied, so there is no torch on your roof — a real plus over a Brighton conversion or extension.
It is matte black and not intended as a walking surface, so it is less suited to a roof terrace. On very large roofs the seams are bonded rather than continuous, though done properly they are entirely watertight.
EPDM is trimmed with metal or bonded kerb detailing at the edges and around any upstands, rooflights or pipes. On a Brighton roof the edge and upstand detailing is where wind-driven rain is defeated, so we take as much care there as on the field of the roof — a membrane is only as good as its perimeter.
GRP cures to a hard, glossy, fully seamless laminate that can be topcoated in any colour and walked on freely — ideal for a balcony or roof terrace, which Brighton's converted townhouses often have. Crisp fibreglass trims give a very tidy edge detail.
It is rigid, so on a large roof that flexes it can craze or hairline-crack over time, and it needs dry, reasonably warm conditions to cure — which can push a Brighton winter job back a few days. Repairs mean grinding back and re-laminating.
GRP's fibreglass trims give a crisp, hard edge that many homeowners prefer the look of, and it laps seamlessly into upstands and around rooflights. Because it cures rigid, the bond to a sound, dry, well-fixed deck is critical — which is why deck preparation is a big part of a good GRP job.
The honest answer depends on your roof, not on which we would rather fit — both are excellent when matched correctly.
Brighton's flat roofs take a beating — salt-laden wind off the Channel, strong UV in summer and driving rain. EPDM's flexibility and UV resistance make it our default on exposed roofs and larger 1960s-block flat roofs, while GRP's hard, walkable finish suits the roof terraces and small rear extensions common on Hove and Kemp Town conversions. On any exposed Brighton roof, edge detailing and wind-uplift fixing matter as much as the membrane itself.
Many Brighton flat roofs also sit below the eyeline of a taller neighbour or a terrace above, so appearance and a reliable, low-maintenance surface matter. Where a roof is overlooked or walked past daily, GRP's tidy coloured finish appeals; where it's out of sight and exposed, EPDM's resilience usually wins on merit.
| Aspect | EPDM | GRP |
|---|---|---|
| Small extension roof (up to 15m²) | £1,200–£1,800 | £1,400–£2,000 |
| Typical rear-extension / garage | £1,800–£3,000 | £2,000–£3,300 |
| Larger flat roof / small block | £3,000–£6,000+ | £3,300–£6,500+ |
| Roof terrace / balcony (walkable) | Not ideal | £2,200–£4,000 |
Indicative Brighton pricing including tear-off, new deck where needed and trims. Every quote follows a free survey. No deposit; staged payments with nothing before materials are on site.
Either way the job runs the same: a free survey to check the deck and detail the roof, a fixed written quote, then strip (or overlay), any deck repair, insulation where wanted, the membrane, and full edge and upstand detailing — signed off with the 10-year workmanship guarantee.
For a typical Brighton flat roof — an exposed extension or a 1960s-block roof — EPDM is our usual recommendation for its flexibility and coastal resilience. For a small roof or a walkable terrace on a Hove or Kemp Town conversion, GRP earns its place. Have us survey it and we'll recommend for your roof, in writing, with no pressure either way.
EPDM typically lasts 25–40+ years and GRP around 20–30. Both far outlast felt. On exposed Brighton roofs EPDM's flexibility often gives it the edge over the very long term, as it moves with the roof rather than resisting it.
GRP. Its hard, seamless laminate is made to be walked on and can be finished with anti-slip. EPDM is a weatherproofing membrane rather than a wearing surface, so for a Brighton balcony or terrace we'd normally recommend GRP.
EPDM, yes — it's cold-applied and not weather-critical to cure. GRP needs dry, reasonably warm conditions to cure properly, so a Brighton winter job may wait for a suitable window. We'll advise honestly at survey.
For a larger or exposed roof, EPDM usually gives the best cost-per-year. For a small roof or a walkable terrace, GRP's hard finish justifies its slightly higher cost. Neither is dear next to re-felting every 10–15 years.
Only if the existing deck is soft or rotten. We check it at survey; often the boards are sound and we simply overlay. Where the deck has failed — common under an old, leaking felt roof — we renew it, and that's itemised separately.
GRP pairs naturally with a walkable terrace. Both work around a rooflight; we flash the upstands correctly for the system. If you're planning a terrace or Velux, mention it at survey so we detail the roof for it.
Both, roughly evenly — it genuinely depends on the roof. Exposed and larger roofs tend to get EPDM; small roofs and terraces tend to get GRP. We recommend by the roof in front of us, not by preference.
Sometimes — if the existing deck and covering are sound and level, an overlay saves stripping. More often, an old Brighton felt roof hides a soft deck, so we check first and only overlay where it's genuinely sound. Building the roof on a bad deck is a false economy we won't do.
Yes — our workmanship is guaranteed for 10 years in writing, and the membrane materials carry their own manufacturer warranties on top (terms vary by product). We hand over both at sign-off, and the workmanship guarantee is transferable if you sell.
The honest way is a free survey. We look at your actual Brighton roof — its size, condition, pitch, aspect and setting — and recommend the option that genuinely fits, in writing, with both costed if it's a real choice. There's no obligation to book the work, and we'd rather you chose right than chose dear.
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