SIKAPLAN SINGLE-PLY & WARM ROOF UPGRADES IN SOUTHFIELDS SW18 & SW19
Across the Edwardian red-brick terraces of the Southfields Grid—lining Clonmore Street, Engadine Street, Astonville Street, and Elborough Street—the 1930s family homes of the Pirbright Road Estate, and the detached residences along Wimbledon Park Road and Victoria Drive bordering Wimbledon Park (SW18 and SW19), side-return kitchen extensions, L-shaped rear loft dormers, and outrigger additions rely on watertight flat roofing. When aged mineral felt blisters under summer sun or standing water pools on zero-fall timber decks, damp quickly tracks into ground-floor kitchens and top-floor loft bedrooms. Operating as an NFRC-accredited flat roofer London homeowners across South West London rely on, London Roofing Specialist strips failed coverings back to the structural joists to engineer flame-free Sikaplan and Sika Sarnafil single-ply, vulcanised EPDM rubber, and cold-applied liquid waterproofing systems.
Structural Deck Reinforcement, Vapour Barriers & Skylight Kerbs
As shown in our project photography, upgrading a flat roof in SW18 and SW19 starts with exposing the C24 timber joists, fitting graduated firring strips to create a positive 1:40 drainage gradient to BS 6229 standards, and laying a continuous commercial-grade vapour control layer. Over this foundation, we mechanically fix high-density rigid polyisocyanurate (PIR) warm roof insulation boards and construct thermally broken 150mm timber upstand kerbs for architectural glass skylights and boiler flue vents.
SIKA SINGLE-PLY, EPDM RUBBER & STANDING SEAM DETAILS IN SW18 & SW19
Whether we are waterproofing a contemporary wrap-around kitchen extension off Replingham Road or renewing an exposed L-shaped loft dormer near Wimbledon Park Station, we tailor every membrane and perimeter detail to your property’s thermal and architectural requirements.
Sikaplan & Sika Sarnafil Single-Ply Membranes
Glass-fleece reinforced thermoplastic membranes in Lead Grey and Anthracite, hot-air welded into a monolithic, UV-stable barrier with a 40+ year BBA-certified service life.
Vulcanised One-Piece & Fleece-Backed EPDM
Seamless synthetic rubber sheets cold-adhered across SW18 and SW19 side-return extensions, garden studios, and garages without vulnerable joint laps.
Standing Seam & Stepped Lead Parapet Detailing
As illustrated in our roofline photography, we pair flat roof membranes with architectural standing-seam fascia claddings and stepped Code 5 rolled lead counter-flashings chased into London stock and red brickwork, working alongside our roofer Southfields slating and tiling team where flat dormer and extension roofs meet pitched slopes.
Part L Rigid PIR Warm Roof Insulation
130mm to 150mm foil-faced thermal insulation boards laid above the structural deck to eliminate cold bridging, prevent interstitial condensation, and cut winter heating bills.
Zero-Flame Waterproofing for Southfields Grid Terraces & Flats
We never bring naked bitumen gas torches onto residential properties in Southfields. Every Sikaplan, Sarnafil, EPDM, and liquid membrane we install is fused using calibrated Leister hot-air welders or cold-applied adhesives—eliminating fire risk near dry Edwardian timber eaves and satisfying strict household insurance conditions.
ARCHITECTURAL SKYLIGHTS, SOIL VENTS & MANSARD JUNCTIONS
Look closely at our project photography and you will see how we weather complex penetrations—from wide frameless glass skylights on Southfields Grid kitchen extensions to twin boiler flues and soil vent pipes—using custom-formed polymeric pipe collars and hot-air welded upstand flashings. Where a flat roof abuts a pitched slate slope or a brick party wall in SW18 and SW19, we replace brittle cement fillets with flexible Code 5 lead aprons and terminated membrane bars so seasonal timber movement never opens a leak path.
Wandsworth & Merton Building Control Part L Sign-Off
Because Southfields straddles the boundary between the London Borough of Wandsworth (SW18 and the Grid) and the London Borough of Merton (towards Wimbledon Park and Village in SW19), replacing more than 50 per cent of a flat roof thermal envelope triggers mandatory Building Regulations Part L upgrading. Our surveying team handles all Wandsworth and Merton Building Control notifications and U-value calculations on your behalf.
10-YEAR INSURED GUARANTEES & SOUTHFIELDS FLAT ROOF SURVEYS
Every complete flat roof replacement, warm roof upgrade, and skylight installation we undertake across the Southfields Grid, Wimbledon Park, West Hill, and Earlsfield borders is carried out by our directly employed operatives without sub-contractors. Your property is protected by a 10-year insurance-backed workmanship guarantee alongside 15-to-25-year manufacturer membrane warranties and £10m public liability insurance. View our wider portfolio of projects.
Frequently Asked Questions: Flat Roofer Southfields SW18 & SW19
Call our surveying team today to book your free, no-obligation Southfields flat roof survey: 020 7205 4557
Why is our side-return extension or L-shaped loft dormer in the Southfields Grid leaking?
On Edwardian terraces across Clonmore Street, Engadine Street, and Revelstroke Road, side-return and loft dormer flat roofs usually leak because the original builder mounted the skylight too low on a zero-fall deck or used sand-and-cement mortar where the flat roof meets the neighbour’s brick party wall. We strip the failed covering, install tapered firrings for a 1:40 fall, build a raised 150mm insulated timber kerb for the skylight, and chase stepped Code 5 lead flashings into the party wall brickwork.
Which membrane is best for a sunny south-facing kitchen extension or loft dormer in SW18 & SW19?
Glass-fleece reinforced Sikaplan or Sika Sarnafil single-ply and one-piece vulcanised EPDM rubber are ideal for exposed Southfields roofs. Unlike torch-on mineral felt, which blisters and cracks under intense summer UV heat, hot-air welded single-ply and EPDM remain permanently flexible for over four decades.
