
Trade pricing
Specialist flat roofing supplies
Long-lasting flat-roof membranes, roof kits, adhesives and accessories for sheds, garden rooms, garages, extensions and commercial roofing projects.

Shop the department
Start here
Compare
Select a system to compare cost, installation difficulty and key benefits.
A versatile one-piece EPDM membrane for garages, extensions and other small-to-medium flat roofs.
Relative cost
BudgetInstallation difficulty
BeginnerKey pros
Considerations

A cold-applied EPDM system supplied in large sheets to reduce the number of seams. It combines long-term weather resistance with straightforward installation and is well suited to domestic flat-roof projects.
Installation guidance
Bond the membrane with water-based deck adhesive and use contact adhesive at edges and details. A hand roller is sufficient for the main installation; no heat or naked flame is needed.
Best suited for
Domestic garages, extensions, dormers, warm roofs and small-to-medium flat roofs
Suitable roof types
Garages, extensions, dormers, garden rooms, warm-deck roofs and green-roof builds
Membrane type
One-piece EPDM rubber membrane
Thickness
1.2mm and 1.5mm
Available widths
Sheets up to 15.25m × 30.5m
Joining method
Splice tape or cover tape where additional joins are required
Suitable substrates
Plywood or OSB3 roof decks; suitable tissue-faced insulation where the project specification permits
Full advantages
Full considerations
Cost and installation indicators are relative guides for comparison only — not a quotation or professional roofing advice. Actual requirements vary by project.

Trade and technical support
Trade pricing, saved projects, fast quotations and flexible account support for professional roofers and merchants.
Guides and support
Installation guidance, technical documents and practical answers in one place.
Long Service Life
EPDM membranes can last decades when correctly installed.
One-Piece Installation
Large sheets mean fewer seams and fewer potential leak points.
UV & Ozone Resistant
Formulated to withstand prolonged sun exposure.
Flexible Membrane
Stays flexible across temperature changes and building movement.
Stonegate Supplies uses essential cookies to operate our website. With your permission, we’d also like to use cookies to understand how you use Stonegate, improve our services, personalise your experience and measure our marketing.