Strip and replacement
Old felt stripped, deck inspected and replaced where needed, new GRP system installed from bare boards up.
Flat Roof Repair
Fareham
CMW Roofing & Renovations carries out flat roof repair and replacement across Fareham and the surrounding PO14–PO17 area. A large proportion of Fareham's housing stock includes garages and extensions with flat roofs — many now at or beyond the end of their felt lifespan. We install GRP fibreglass systems that are seamless, jointless and far more durable than the felt they replace.
GRP fibreglass systems
20-year manufacturer guarantee
Garages & extensions
£5m insured
5-star reviews
Recommended locally
Fully insured
Work completed safely
Free quotes
No pressure, no fuss
GRP Flat Roofing in Fareham
Garages and extensions with flat roofs are common across Fareham's PO14–PO17 postcode area. Many were built with traditional felt systems that are now at the end of their lifespan — leaking, bubbling or splitting at the lap joints. We replace them with GRP fibreglass, which removes those failure points entirely.
Our GRP flat roof process in Fareham begins with stripping the old felt back to the deck. We inspect the roof boards for rot or movement and replace any that are no longer sound before laying the new system. Edge trims are fitted and fixed, a primer coat is applied to the deck, and primer bandage is bedded into all joints and upstands. The GRP topcoat is then applied across the full surface in a single seamless pour — no laps, no joints, no future failure points. A coloured gelcoat finish is applied to complete the installation.
GRP flat roofing carries a 20-year manufacturer guarantee and, when properly maintained, will outlast any felt system. We cover garage roofs, extension flat roofs, bay window roofs, dormer cheeks and any other flat or low-pitch surface across the Fareham area. All our work includes a written workmanship guarantee alongside the manufacturer guarantee on the materials.
Edge trims and upstands
Aluminium edge trims fitted and fixed before GRP application to give a clean, weathertight perimeter on all Fareham flat roofs.
Primer and bandage
Primer coat applied to the full deck surface and primer bandage bedded into all joints and junctions before the topcoat is laid.
GRP topcoat
Seamless GRP topcoat applied in a single continuous pour — no lap joints, no seams, no future failure points on your Fareham flat roof.
Deck board replacement
Rotten or damaged roof boards identified during strip-out and replaced before the new system is laid, so the guarantee is not compromised.
Flat roof repairs
Where the existing deck is sound, we can carry out targeted GRP repairs rather than a full replacement — we advise honestly on which option suits your roof.
Areas we cover
We cover flat roof work across Fareham, Portchester, Titchfield, Locks Heath, Stubbington, Hill Head, Whiteley and the wider PO14–PO17 area. If you are not sure whether we cover your location, call or message and we will confirm.
We typically respond to enquiries within a few hours and can usually arrange a free site visit and written quote within a few days.
FAQs
What is the best flat roof system for a garage in Fareham?
GRP fibreglass is the most durable option for garages and extensions in Fareham. It is seamless, jointless, and carries a 20-year manufacturer guarantee — far outlasting traditional felt systems.
How long does a flat roof replacement take in Fareham?
Most single-garage flat roofs can be completed in one day. Larger roofs on extensions or outbuildings may take two days. We confirm the timeframe when we provide your free quote.
Do you repair as well as replace flat roofs in Fareham?
Yes. Where the existing deck is in reasonable condition we can carry out targeted repairs. We advise honestly on whether a repair or full replacement is the better value option for your roof.
Does a new GRP flat roof add value to my Fareham property?
A GRP flat roof with a valid guarantee is viewed positively by surveyors and buyers compared to an aging felt roof. It removes a common concern for mortgage lenders on properties with flat-roofed extensions.
Have a question not answered above?
Call 07876 803 029Recent flat roof work
Get a free flat roof quote in Fareham
Call or message for a free, no-obligation quote. We cover Fareham and the surrounding PO14–PO17 area and aim to respond the same day.