Flat Roof Replacement in Wokingham
Roof repairs, re-roofs and flat roof specialists across Wokingham. Free surveys, fixed written quotes, tidy workmanship.
Wokingham Roofing Company replaces failed flat roofs on extensions, garages, dormers and porches across Wokingham. Most of the roofs we're asked to look at are mineral felt laid twenty-plus years ago, now blistered, cracked at the edges and ponding after rain. Patching felt at that age is money down the drain — the honest conversation is which modern system replaces it.
Berkshire's postwar extensions and garage blocks were nearly all felted, so this is bread-and-butter work here: strip the old layers, sort the deck, and re-cover in a membrane specified to BS 8217 or the manufacturer's own certified system.
EPDM, GRP or felt — an honest comparison
| System | Installed cost (per m²) | Realistic lifespan | Best suited to |
|---|---|---|---|
| EPDM rubber (e.g. Firestone RubberCover) | £80 – £120 | 30–50 years | Extensions and garages — simple shapes, best value over time |
| GRP fibreglass | £90 – £140 | 25–30 years | Complex shapes, balconies, roofs that get walked on |
| High-performance felt (torch-on) | £60 – £95 | 15–20 years | Budget-led jobs, matching existing felt details |
2026 guide rates including edge trims and outlets. Deck repairs found on strip-up are priced per board and agreed before fixing.
What replacement actually involves
Full strip, not overlay
Old felt comes off completely. Overlaying trapped moisture is how flat roofs rot from the inside — we don't do it.
Deck inspection
Chipboard decks from the 70s and 80s rarely survive a leaking roof. Soft boards are swapped for 18mm OSB3, priced per sheet.
Falls corrected
Ponding means the falls were wrong from day one. Firring strips or tapered insulation put a genuine 1:80 fall back into the roof.
Warm roof build-up
Rigid insulation above the deck brings the roof up to current Building Regulations Part L and stops condensation forming underneath.
Which system for which roof?
For a straightforward rectangular extension or garage roof, EPDM in a single sheet is hard to argue against — no seams, no naked flame, decades of life. Where the roof has parapets, multiple upstands or doubles as a balcony, GRP's seamless laminate and non-slip topcoat earn their premium. Felt still has a place where budget rules or where a small section must tie into existing felt details.
We install all three, so the recommendation follows the roof rather than the van stock.
EPDM rubber in detail
Membrane, trims and lifespan — the full picture.
GRP fibreglass in detail
Wet-laid laminate, topcoats and balcony work.
Garage roofs
Concrete garages and asbestos-era sheets are their own subject.
Frequently asked questions
Ready for a free, no-obligation quote?
Call 0118 230 1710