SIKA WARM ROOFS & SLIDING GLASS ROOFLIGHTS IN BARNES SW13
Across Barnes (SW13), from grand riverside properties along The Terrace and detached residences on Castelnau to Victorian family homes bordering Barnes Green and Lonsdale Road, flat roofs cover ground-floor kitchen-diners, side-return extensions, garages, and top-floor loft dormers. On our recent residential new-build and extension project in Barnes, London Roofing Specialist acted as the principal flat roofer, engineering a high-performance Sika warm roof assembly paired with an automated sliding glass rooflight and fixed daylight panels.
Timber Deck Carpentry, Tapered Firrings & Sliding Rooflight Kerbs
As shown in our Barnes project photography, integrating a heavy sliding glass rooflight requires robust structural carpentry before any waterproofing layer is laid. Our tradesmen double up the C24 trimming joists around each structural opening, construct rigid 150mm insulated timber upstand kerbs, and fit graduated firring strips beneath 18mm WBP marine plywood decking so rainwater drains cleanly towards the perimeter outlets without ponding.
150MM PIR THERMAL INSULATION & PART L UPGRADES IN SW13
Uninsulated flat roofs above open-plan kitchens and garden rooms lose warmth rapidly in winter and overheat under direct summer sun. To create an energy-efficient building envelope on our Barnes installation, our operatives laid a continuous foil-faced vapour control barrier over the structural deck followed by 150mm of rigid PIR thermal insulation boards, eliminating cold bridging and interstitial condensation while exceeding UK Part L Building Regulations.
Sika Sarnafil & IKO Single-Ply Membranes
Hot-air welded thermoplastic membranes offering crisp architectural detailing, high solar reflectance, and complete immunity to standing water.
Sliding Glass Rooflights & Fixed Skylights
Precision timber kerb framing and welded membrane upstand collars for electric sliding roof hatches, walk-on glass panels, and pitched lanterns.
One-Piece EPDM Rubber & GRP Fibreglass
Flame-free synthetic rubber sheets and resin-laminated fibreglass decks tailored to SW13 garage roofs, bay window tops, and box dormers.
Cold-Applied Elastomeric Liquid Coatings
Fibre-reinforced polyurethane resins brushed around complex brickwork junctions, soil stacks, and balcony door thresholds.
Manufacturer-Approved & NFRC Accredited Flat Roofer
Unlike general builders who rely on short-lived torch-on felt, every flat roofer on our Barnes team holds verified Sika and IKO manufacturer training, ensuring your warm roof build-up meets strict British Standards (BS 6229).
BRICK PARAPET CAPPING & FLAME-FREE HOT-AIR WELDING
Where a flat roof is enclosed by masonry parapet walls, water ingress frequently starts at the top coping stones or vertical upstands. As illustrated in our Barnes rooftop photography, we dress the Sika Sarnafil membrane right up the internal brick parapet face and mechanically secure pre-formed perimeter cappings and lead counter-flashings to seal the wall head completely. Every lap joint is fused using temperature-controlled hot-air welding machines—never naked gas flames—forming a permanent, monolithic bond across the entire roof footprint.
Weather-Tight Upstand Details Around Structural Glazing
Skylights leak when bodged with silicone sealant or poorly lapped bitumen felt. We hot-air weld bespoke single-ply corner gussets and upstand collars directly to the coated metal kerbs of every rooflight for a maintenance-free seal.
10-YEAR INSURED GUARANTEES & BARNES FLAT ROOF SURVEYS
Every complete flat roof replacement and warm roof upgrade we deliver in Barnes (SW13) is executed by our own vetted, directly employed operatives and backed by a 10-year insurance-backed workmanship guarantee alongside manufacturer material warranties and full public liability cover. View our wider portfolio at londonroofingspecialist.co.uk/projects/all/.
Call our local office today to book your free, no-obligation Barnes flat roof survey: 020 7205 4557
Frequently Asked Questions: Flat Roofer Barnes SW13
Can you install an electric sliding glass rooflight when replacing our flat roof in Barnes?
Yes. Stripping an old felt or asphalt roof down to the bare joists is the ideal stage to trim and double up the structural timber rafters to support a sliding glass rooflight or roof terrace access hatch. We manage the structural timber kerbs, 150mm PIR warm roof insulation, hot-air welded Sika membrane, and Building Control sign-off as one turnkey package.
How long does a Sika Sarnafil or EPDM flat roof last compared to traditional felt?
Standard mineral felt typically blisters and splits within 10 to 15 years under UV exposure and standing water. By contrast, a mechanically fixed Sika Sarnafil single-ply or one-piece EPDM rubber roof remains permanently flexible across all seasons and delivers an expected service life of 35 to 40 years.
