FLAT ROOF REPLACEMENTS & SKYLIGHT FRAMING ACROSS W4
From Arts and Crafts houses in Bedford Park and riverside properties along Strand-on-the-Green to Victorian terraces off Chiswick High Road and Turnham Green, flat roofs protect kitchens, side-return extensions, and top-floor dormers across W4. When ageing mineral felt blisters or old asphalt cracks under thermal movement, ponding rainwater quickly finds its way into ceiling joists. London Roofing Specialist strips failed coverings back to the bare structural timbers, re-levels the substrate, and installs long-life waterproofing membranes tailored to Chiswick properties.
Timber Skylight Kerbs, Tapered Firrings & OSB3 Decking
As shown in our Chiswick project photography, installing flat glass rooflights or pitched lanterns requires accurate carpentry before any membrane is laid. Our tradesmen double up the structural C24 rafters around the opening, build insulated timber upstand kerbs at least 150mm above the deck, and fit tapered firring pieces so rainwater drains cleanly into the perimeter outlets without pooling.
EPDM RUBBER, GRP FIBREGLASS & SIKA SINGLE-PLY IN CHISWICK
Different flat roofs across the London Borough of Hounslow require different membrane characteristics depending on sun exposure, foot traffic, and structural movement. Our NFRC-accredited installers fit flame-free waterproofing systems backed by manufacturer approvals.
One-Piece EPDM Rubber Membranes
Cold-applied synthetic rubber sheets fitted without vulnerable field seams, ideal for Chiswick kitchen extensions, garages, and box dormers.
Seamless GRP Fibreglass Laminates
Catalysed polyester resin and chopped-strand mat fibreglass systems formed with pre-moulded edge trims for rigid, impact-resistant weatherproofing.
Sika Sarnafil & Wolfin Single-Ply
Hot-air welded thermoplastic membranes engineered for large-span flat roofs, crown decks, and commercial premises along Chiswick High Road.
Cold-Applied Liquid Polyurethanes
Fibre-reinforced elastomeric coatings brushed around intricate parapet upstands, soil pipes, and balcony door thresholds.
Part L Warm Roof Insulation
High-density rigid PIR insulation boards laid over a continuous vapour control layer to stop interstitial condensation and cut winter heat loss.
Flame-Free Waterproofing for Period Timber Structures
We never use naked bitumen gas torches near dry period rafters or sash window frames. By specifying cold-applied EPDM, GRP fibreglass, or hot-air welded single-ply membranes, we eliminate fire risks during construction while delivering a cleaner, longer-lasting bond.
GLAZED ROOF LANTERNS & WARM ROOF UPGRADES IN W4
Replacing a dark, uninsulated flat roof over a rear dining room is the ideal opportunity to bring natural light and warmth into the heart of your home. We construct insulated warm roof decks and integrate bespoke aluminium or timber roof lanterns, dressing the membrane right up the vertical kerb faces beneath weathered lead or metal flashings.
Safe Scaffolding, Clear Timelines & Tidy Site Management
Every Chiswick flat roof replacement is overseen by an experienced project manager from initial core inspection to final sign-off. We erect tidy, secure scaffolding, protect rear gardens and patio paving, and ensure your extension remains weather-sheeted overnight throughout the works.
10-YEAR INSURED GUARANTEES & CHISWICK FLAT ROOF SURVEYS
Every complete flat roof replacement we install in W4 is carried out by our own vetted, directly employed technicians and backed by a 10-year insurance-backed workmanship guarantee alongside full public liability insurance. View our wider portfolio.
Call us to book your free, no-obligation Chiswick flat roof survey: 020 7205 4557
Frequently Asked Questions: Flat Roofers Chiswick W4
Which is better for a Chiswick kitchen extension: EPDM rubber or GRP fibreglass?
Both systems far outlast traditional torch-on felt. One-piece EPDM rubber flexes naturally with seasonal timber movement and is ideal for wide extension roofs with multiple skylights. GRP fibreglass cures into a hard, seamless shell with pre-formed perimeter trims, making it a strong choice for smaller roofs, walkways, and balconies. Our surveyor will inspect your roof deck and bring samples of each system to your W4 appointment.
Can you stop water pooling on my existing flat roof?
Yes. Ponding water happens when joists deflect over time or when the original builder failed to install tapered firring strips. When we strip your old roof covering, we fit graduated timber firrings or tapered PIR insulation boards to build a positive 1:40 fall towards the gutter or rainwater outlet.
