Designed for sheds, log cabins, garden rooms, garages and outbuildings. Build a complete 1.0mm EPDM rubber roof kit in minutes — set your roof size and edges on the plan and we'll price the membrane, adhesive, trims and everything else, itemised line by line.
1 · Roof Shape
Which plan shape matches your roof? You'll set the exact size of every edge on an interactive plan in the next step.
This calculator builds 1.0mm kits for sheds, log cabins, garden rooms, garages and outbuildings, up to 4.7m × 10m. Roofing a house extension, a larger roof, or one with a notch or return? Use our 1.2mm & 1.5mm roof kit calculator instead.
Every 1.0mm roof is supplied as one continuous piece — it is not joined with seam tape, so there are no seams on your roof. Apex roofs get a single sheet laid over the ridge.
2 · Size & Edges
Tap a lettered marker on the plan to set that edge's length and what happens at that edge — the plan and price update live.
Measure in:
Opposite roof edges must be of equal length to ensure your roof has 90° corners.
For large or awkward roofs we supply the membrane as two half-width pieces, each with a 75mm overlap, joined on site with seam tape (included). The cut line is shown dashed on the plan. Learn: joins & detailing ↗
You can add Skylight Voids to your roof. This will make allowance for the hole and any additional products required for the skylight upstands. Drag a void on the plan to position it — click it to edit. Learn: rooflights on extensions ↗
Do you have any skylights in your roof?
Enter the size of your void
If your upstand is angled, enter the highest side measurement. We will assume a timber upstand is being used. Click and drag the void on the roof to position it. Click the void to edit it.
✓1.0mm Membrane — sheds & outbuildings—
Our cost-effective membrane for garden buildings — sheds, log cabins, garden rooms, garages, porches and outbuildings. Supplied in one piece, bonded down, no heat or flames. For house extensions or anything needing building-regulations sign-off, use the 1.2mm and 1.5mm calculator.
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✓★ Premium1.5mm Premium Membrane—
All the benefits of 1.2mm with a thicker, tougher, better-looking finish.
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This is your complete kit total including VAT — membrane, adhesives, trims and extras.
2. Recommended for your project
Optional extras that will help you install your roof.
🧰 Everything in your chosen kit is added to your basket in one click as your complete Rubber Roof UK kit.
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Estimates use standard EPDM coverage rates: deck adhesive 3–4 m²/L, contact adhesive 0.5 L/m² (both sides). Trims supplied in 2m lengths; membrane cut to size and supplied in one piece. Final quantities confirmed at checkout.
Order today for delivery by —
Running total VAT included£0.00ex. VAT £0.00
Rubber Roof UK · rubberroofuk.uk · EPDM flat roofing supplies
