CROWN DECKS, EXTENSIONS & SKYLIGHT FRAMING IN W11 & W14
Grand stucco-fronted villas around Ilchester Place, double-fronted Victorian residences along Addison Road, and lateral apartments off Holland Park Avenue rely on hidden crown flat roofs, lower-ground kitchen extensions, and garage decks. When ageing mineral felt blisters under summer sun or brittle mastic asphalt splits along parapet upstands, standing rainwater quickly penetrates the ceiling joists below. Operating from nearby Kensington High Street as an accredited flat roofer in Holland Park, London Roofing Specialist strips perished coverings back to the bare structural timbers to install long-life, flame-free waterproofing systems.
Insulated Timber Upstand Kerbs, Firring Strips & Marine Ply Decks
As illustrated in our W11 rooftop photography, fitting frameless glass skylights or multi-pane lanterns demands exact structural carpentry before any waterproof layer goes down. Our roof carpenters double up the C24 trimming joists around each aperture, construct rigid 150mm insulated timber upstands, and fix graduated firring pieces beneath 18mm WBP marine plywood decking so rainwater clears rapidly into the perimeter outlets without ponding.
EPDM RUBBER, GRP FIBREGLASS & SIKA SYSTEMS IN HOLLAND PARK
Flat roof architecture across the Royal Borough of Kensington and Chelsea varies from wide-span top-floor crown decks to compact side-return dining extensions. Our NFRC-approved technicians specify and install manufacturer-warranted membranes suited to the exact thermal movement and foot-traffic demands of your building.
One-Piece EPDM Synthetic Rubber
Cold-bonded elastomeric rubber sheets laid without vulnerable field joints, accommodating natural structural movement across W11 rear extensions and dormers.
Resin-Laminated GRP Fibreglass
Catalysed polyester resin and chopped-strand mat fibreglass decks finished with pre-formed perimeter drip trims for a tough, impact-resistant shell.
Sika Sarnafil & Wolfin Single-Ply
Hot-air welded thermoplastic membranes engineered for expansive Holland Park crown roofs, podium decks, and commercial premises.
Cold-Applied Polyurethane Liquid Coatings
Fibre-reinforced liquid waterproofing brushed seamlessly around complex stucco parapet walls, cast-iron soil stacks, and balcony thresholds.
Part L Warm Roof Thermal Upgrades
High-density rigid PIR insulation boards installed above a continuous foil-faced vapour barrier to prevent interstitial condensation and cut winter heating bills.
Zero-Flame Waterproofing for Listed & Conservation Properties
We never use naked bitumen gas torches near dry nineteenth-century roof timbers, wooden sash boxes, or heritage stucco cornices. Specifying cold-applied EPDM rubber, GRP fibreglass, or hot-air welded single-ply membranes eliminates fire hazards during installation while delivering a cleaner, permanent weather seal.
GLAZED ROOF LANTERNS & WARM DECK OVERHAULS IN W11
Replacing a tired, uninsulated flat roof above a rear kitchen-diner or studio room off Clarendon Road or Lansdowne Walk is the ideal moment to flood the interior with natural daylight. We build Part L compliant warm roof assemblies and integrate bespoke aluminium or timber roof lanterns, dressing our waterproof membranes right up the vertical kerb faces beneath stepped Code 5 lead flashings.
RBKC Scaffolding Licences & Discreet Site Management
Every Holland Park flat roof project is managed from initial core sampling through to final Building Control sign-off. We arrange all necessary RBKC pavement permits, protect landscaped gardens and Yorkstone terraces, and keep your property weather-sheeted overnight throughout the build.
10-YEAR INSURED GUARANTEES & HOLLAND PARK ROOF SURVEYS
Every complete flat roof replacement we execute in W11 and W14 is completed by our own vetted, directly employed operatives and backed by a 10-year insurance-backed workmanship guarantee alongside full public liability cover. View our wider portfolio at londonroofingspecialist.co.uk/projects/all/.
Call our local Kensington office to book your free, no-obligation Holland Park flat roof survey: 020 7205 4557
Frequently Asked Questions: Flat Roofer Holland Park W11 & W14
Which flat roof membrane is best for a Holland Park crown roof or rear extension?
For large high-level crown decks on stucco villas, hot-air welded Sika Sarnafil single-ply offers exceptional solar reflectance and a 35-year+ service life. For ground-floor kitchen extensions with skylights or roof lanterns, one-piece EPDM rubber or seamless GRP fibreglass provides a clean, joint-free finish that flexes with the timber deck. Our surveyor brings physical membrane samples to your W11 appointment so you can compare them directly.
How do you stop rainwater pooling on an older flat roof in W11?
Standing water occurs when timber joists sag over decades or when the original roof was built flat without a drainage gradient. When stripping the old covering back to the joists, we install tapered timber firring strips or tapered PIR insulation boards to establish a positive 1:40 fall into the lead box gutters and downpipes.
