Compton is chalk escarpment village immediately south of Winchester with high-value detached properties on exposed chalk ridge above the Itchen Valley. chalk escarpment above the Itchen Valley with the highest wind exposure of any area in the coverage zone; north and west-facing pitches face unobstructed south-westerlies. flat-roofed extensions on detached properties face significant wind loading; GRP and EPDM outperform felt substantially on exposed Compton plots. GRP fibreglass is our recommendation for most Compton domestic flat roofs — the seamless installation eliminates the joint failures that cause felt to leak, and the 25-year manufacturer warranty gives genuine long-term confidence. The chalk escarpment above the Itchen Valley with the highest wind exposure of any area in the coverage zone; north and west-facing pitches face unobstructed south-westerlies means felt systems in Compton tend toward the lower end of their lifespan range.
GRP Fibreglass Flat Roofing in Compton
Before any flat roof installation in Compton we inspect the structural deck boards. Where deck boards are soft, saturated or delaminating, we replace them as part of the installation — deck replacement is included in the written quote after survey. We never install a new membrane over a failing deck. EPDM rubber in single fully-bonded sheets is the alternative for larger flat roof areas — sheets up to 12m wide cover most domestic Compton extensions in one piece with no joints at all.
Deck Condition and EPDM in Compton
Free survey and written quote in Compton. No call-out fee. No obligation. Call 01962 809171.
Flat Roof Costs in Winchester (2025)
| Flat Roof Type | Typical Cost |
|---|---|
| GRP fibreglass — extension (20m²) | £1,800–£2,800 |
| GRP fibreglass — garage | £900–£1,600 |
| EPDM rubber — large extension | £1,600–£3,200 |
| Deck replacement (if required) | £150–£450 add |
| GRP manufacturer warranty | 25 years |
What a Flat Roof Survey Involves
We survey the existing membrane from the roof surface — checking for blistering, cracking, joint failure and drainage falls. We inspect the deck boards at the edges and any accessible areas for softness or delamination. We check the outlet drainage and confirm the fall direction. The written survey report confirms whether repair is appropriate or whether replacement is the better value decision, with costings for both options where repair is viable. Deck replacement cost, where required, is confirmed before work starts — not discovered and charged afterwards. Free survey and written fixed quote. Call 01962 809171.