GNR Roofing Services
Sarnafil Membranes
Accredited Sarnafil® single-ply roofing contractors in Yorkshire. Design, installation, and long-life warranties for new build and refurbishment flat roofs.
GNR Roofing Services
Sarnafil® Single-Ply Specialists
We deliver Sarnafil membranes that last: expertly detailed, precision installed, and backed by manufacturer warranties.
Sarnafil PVC single-ply is a proven solution for warm, cold and inverted flat roof build-ups. It offers rapid installation, excellent fire and wind-uplift performance, and low maintenance through life. Our teams handle the full package—survey, design & specification, substrate preparation, tapered insulation schemes, vapour control layers, and Sarnafil membranes with certified detailing to penetrations, upstands and edges.
- Warm, cold & inverted roof designs with tapered schemes
- Mechanically fastened, adhered & ballasted Sarnafil systems
- Blue/green roof readiness, balconies & terrace solutions
- Leak-free detailing: outlets, pipe sleeves, rooflights & parapets
- Lifecycle care via planned maintenance and condition reporting
Why choose Sarnafil membranes with GNR Roofing?
Proven performance. Sarnafil membranes combine long-term weathering resistance with high weld integrity. When installed by an accredited team, they deliver durable, low-risk flat roofs with excellent whole-life value. Our in-house supervisors QA every stage, from VCL continuity and fixing patterns to perimeter restraint and terminations.
Lower operational carbon. With tapered insulation options, reflective finishes and robust air-tightness, a Sarnafil flat roof can help reduce heat loss and improve building efficiency. As a result, you benefit from comfort, control and dependable running costs.
Compliance built-in. We align every project with the latest roofing regulations, including Part L energy standards, relevant British Standards for flat roofs, and manufacturer guidance. Our handover packs include warranties, as-built drawings and maintenance guidance to protect your investment.
Read our Roofing Regulations guide
Design & Specification
Target U-values, tapered schemes and drainage set-out for Sarnafil membranes—fully coordinated with your architect and M&E team.
Installation Quality
Certified installers, calibrated hot-air welding, test welds and documented QA for every Sarnafil single ply roof system that we deliver.
Warranty & Aftercare
Manufacturer and workmanship cover plus planned inspections to keep your Sarnafil membrane performing for decades.
Sarnafil membranes: systems & build-ups
Mechanically fastened. Ideal for lightweight decks and refurbishment. Fast install, verified wind-uplift calculations, reduced adhesive use.
Adhered. Smooth aesthetics and secure bond to approved substrates—great for complex geometry and upstands.
Ballasted & inverted. For terraces and podiums using paving or gravel ballast above the Sarnafil waterproofing layer.
Compatible elements. PIR, EPS and mineral fibre insulation; PVC profiles; prefabricated corners; outlets and scuppers. We coordinate with rooflights, PV supports and fall-arrest systems to maintain membrane integrity.
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Certified Sarnafil Installers
Our teams are trained to install Sarnafil membranes to the highest standards with full QA documentation.
We work to current roofing regulations and best-practice guidance, and we coordinate closely with main contractors and designers to minimise risk, programme time and cost.
- Design packs: calculations, details & specification
- On-site QA: pull-out tests, test welds, photographic records
- Handover: warranties, O&M manuals and maintenance plans
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Ready to specify Sarnafil membranes or need help with a live project? Our technical team can assist.
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Frequently Asked Questions about Sarnafil Membranes
How long do Sarnafil membranes last?
Service life predictions for Sarnafil PVC single-ply systems exceed 30 years when installed and maintained correctly. Our maintenance plans help you achieve full warranty life by inspecting seams, terminations and details at agreed intervals.
Can Sarnafil be used on refurbishments?
Yes. Sarnafil membranes are ideal for overlay or strip-to-deck refurbishments, subject to substrate condition and pull-out test results. We’ll advise on VCL upgrades, tapered insulation and drainage improvements during your site survey.
Which regulations apply to Sarnafil flat roofs?
Projects must meet UK building regulations, including energy and fire performance, and follow current flat roof standards. Visit our Roofing Regulations page for an overview and speak to our team for project-specific guidance.
What finish options are available?
Sarnafil membranes come in a range of colours and profiles, with accessories such as standing seam effects, edge trims and compatible components for rooflights, PV and safety systems. We’ll propose options during the design stage.
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