Sika Flat Roofing Contractor London
SWISS-ENGINEERED QUALITY
Produced under stringent ISO 9001 quality management and UKCA/CE marked to BS EN 13956, Sarnafil membranes incorporate an internal non-woven glass-fibre or polyester reinforcement scrim that prevents shrinkage, blistering, or delamination across the roof deck.
ZERO-FLAME HOT-AIR WELDING
Instead of bringing hazardous bitumen gas torches near dry period roof timbers, our certified technicians fuse overlapping membrane seams using calibrated Leister hot-air welders, creating a molecular bond stronger than the sheet itself and achieving full BROOF(t4) fire classification.
PROVEN 40-YEAR BBA LONGEVITY
Independent BBA testing confirms a service life in excess of 40 years for Sarnafil polymeric PVC membranes and over 25 years for flexible polyolefin (FPO) grades, shielded by a proprietary factory-applied lacquer that repels London traffic particulates, acid rain, and organic moss growth.
Flat Roofer London Sika Sarnafil Specialists
ARCHITECTURAL DETAILING VERSATILITY
From self-adhered Sarnafil G410-EL felt-backed membranes and mechanically fastened S327 systems to extruded standing-seam profiles that replicate traditional zinc or leadwork, Sarnafil adapts effortlessly to curved dormers, multi-penetration plant decks, and heritage parapets.
PART L WARM ROOF THERMAL EFFICIENCY
Paired with Sika Sarnavap vapour control layers and high-compressive Sikatherm PIR insulation boards, a Sarnafil warm roof build-up eliminates cold bridging, halts winter interstitial condensation, and slashes heating bills.
INDEPENDENT SIKA FIELD ENGINEER SIGN-OFF
Every registered Sarnafil installation we complete is inspected on site by Sika’s own technical field engineers prior to final handover, unlocking an independent manufacturer material guarantee of 10 to 25 years depending on membrane gauge.
We install Sika Sarnafil G410 and S327 membranes across a curated architectural palette—including Light Window Grey (RAL 7040), Lead Grey (9500), Copper Brown (RAL 8004), Verdigris Copper Patina, solar-reflective Traffic White (RAL 9016), and Signal Red—alongside optional extruded decor profiles for conservation rooflines.
Residential & Commercial Sarnafil Applications
Sika Sarnafil Roofing Contractor London
RESIDENTIAL FLAT ROOFS IN LONDON
Rear kitchen-diner extensions and side returns
Podium roof terraces and walk-on balconies
Sedum green roofs and biodiverse living roofs
Glazed orangeries and lantern upstand decks
Mansard crown roofs, box dormers, and bay tops
Listed and conservation-area lead-grey replacements
COMMERCIAL & MANAGED BLOCKS
Mansion block and apartment roof refurbishments
Office buildings, schools, and healthcare estates
Ballasted, mechanically fastened, and inverted roofs
Bespoke curved, vaulted, and irregular roof geometries
Frequently Asked Questions: Sika Sarnafil Flat Roofer London
Can a punctured or ageing Sika Sarnafil flat roof be repaired without stripping the whole deck?
Yes. Because Sarnafil is a true thermoplastic PVC membrane, localised mechanical damage or new rooflight penetrations can be cleaned using Sika Sarnafil preparation solvent and hot-air welded with a matching membrane patch by an approved technician, restoring a permanent monolithic seal.
What membrane thicknesses do you install?
We install 1.2mm, 1.5mm, 1.8mm, and 2.0mm gauges depending on exposure, foot traffic, and warranty duration, with 1.5mm and 1.8mm fleece-backed grades being the most popular specification for London warm roof extensions and terraces.
LRS Sika Sarnafil & Flat Roofing Work Across London
Specialist Flat Roofing Installers in London
Sika Sarnafil Flat Roofing
Sarnafil is a flat-roofing provider that makes market-leading single-ply roofing membranes. All Sarnafil installations are covered by our 10-year workmanship guarantee, as well as Sarnafil’s own, which ranges from 10 to 25 years dependent on thickness.
Specialist Flat Roofing Installers in London
EPDM Flat Rubber Roofing
Vulcanised one-piece and fleece-backed EPDM rubber membranes provide flame-free, permanent waterproofing with a 40-to-50-year service life across London extensions, dormers, and roof terraces, backed by our 10-year workmanship guarantee.
Specialist Flat Roofing Installers in London
IKO Polymeric Flat Roofing
IKO offer a variety of rubber membranes for flat roofs aimed at providing exceptional waterproofing, UV protection and durability while remaining affordable over a highly durable life span. All of this culminates in a finish that is both effective and aesthetically pleasing.
Specialist Flat Roofing Installers in London
Sika Liquid Plastics Flat Roofing
The Sika Liquid Plastic guarantee offers up to a 25 year guarantee on works using Sika products, which is further backed by the fact a Sika Surveyor will come out to each work and assess that it reaches their quality assurance standards, offering you peace of mind. Increased even further by our 10 year workmanship guarantee.
Specialist Flat Roofing Installers in London
Garland Flat Felt Roofing
Working closely with Garland UK, we can offer Industry-Leading Single-Point Guarantees, removing any doubt or concern and accepting full liability for the design, material, and quality of the installation workmanship on every Garland UK project carried out by our team.
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Sikabit Pro Flat Roofing
Sikabit is a a Pro Bituminous Membrane designed to have market leading waterproofing, durability and UV protection over its long enduring life span, as well as boasting exceptional fireproofing both during and after application.
Specialist Flat Roofing Installers in London
Wolfin Single Ply Roofing
WOLFIN’s single-ply membranes have been tried and tested for 50 years, using the same unique composition.
