Description
A complete one-piece EPDM rubber roof for a garden room, home office, summerhouse or workshop, finished on all four edges with black powder-coated metal trims — the crisp, architectural edge that modern garden buildings are designed around.
The membrane is cut to your chosen size before it leaves us, so it goes on as one sheet with no on-site joining, and it is bonded cold with the water-based adhesive supplied — no torch, no flame, no specialist tools. Most garden room roofs are finished in a day.
Why garden room owners buy this kit from us
- ✓ Free UK delivery on every size, trims included — most suppliers add £16.95 or more to ship the metal trims, which on a £245 kit is a real slice of the price
- ✓ Everything in one box — membrane, adhesive, roller, edge mastic, metal trims, corners and screws
- ✓ Cut to your size before dispatch — one sheet, no on-site joining, nothing wasted
- ✓ Dispatched within one working day, tracked to your door
- ✓ 20-year product guarantee and up to 50 years of service
- ✓ Free size check — WhatsApp a photo and your measurements and we confirm the kit before you pay
- ✓ Free manual and install-day checklist, plus UK phone support mid-job
- ✓ Gutter on one edge? We swap one metal trim for a drip trim at no extra charge — just ask
WhatsApp us a photo of the roof and your deck measurements and we will confirm the right kit the same working day — before you order, not after.
Is this the right kit for your roof?
- ✓ A free-standing garden room, office, studio, summerhouse, workshop or gazebo with a flat or low-pitch timber deck from 2.1m × 2m up to 5m × 7.7m
- ✓ You want a clean black metal edge on every side rather than plastic trims or a dressed-over rubber edge
- ✓ A timber deck — OSB3, WBP plywood or sound boards — that water can run off over one edge
- ✓ You want the whole job in one delivery, fitted in a day with no flame and no specialist tools
The 40mm × 75mm black metal trim screws to the fascia over the dressed-down membrane on all four edges, with a moulded corner at each of the four corners. It holds the edge down against wind, hides the cut line, and gives the roof the straight black shadow line you see on new-build garden rooms.
Roof drains into a gutter on one side? Tell us when you order and we will swap that side's metal trim for a gutter drip trim at the same price, so water is thrown clear into the gutter rather than running behind it.
Other options: our shed kit is the same membrane without trims for a plain dressed edge; the garage kit steps up to 1.2mm EPDM with kerb and gutter trims for larger free-standing roofs. Anything L-shaped or with upstands and outlets is priced line by line in our roof kit calculator.
What is in the box
| 1.0mm EPDM membrane | Supplied as one sheet at your kit size, with no on-site joining required. Black, smooth finish. |
| Water-based deck adhesive | Bonds the membrane to the deck across the whole roof. Low odour, cold applied, no primer needed on timber. |
| Application roller | For spreading the adhesive and bedding the membrane down. |
| Bond & seal edge mastic | Bonds the membrane where it dresses down over the fascia and seals behind the trim. |
| Black metal edge trim — 4 sides | 40mm × 75mm powder-coated metal trim, enough for the full perimeter of your kit size. |
| 4 corner pieces | Matching black corners for the four roof corners — no mitring. |
| Screws | Every fixing the trims need is in the box. |
What is not included
For a standard free-standing garden room, nothing else is needed. You may want to add:
- A gutter drip trim if you would rather add a gutter edge yourself than have us swap one in
- An EPDM pipe flashing boot where a flue, soil pipe or cable passes through
- Walkway pads if anyone will regularly stand on the roof
- Timber and firrings to correct the falls — sourced locally, not something we ship
Choosing the right size
The size on this page is the size of the membrane, not your roof.
The rubber has to reach past the deck on every side so it can dress down over the fascia and sit behind the trim. Allow 150mm on each of the four sides — in other words, add 300mm to each of your deck measurements and pick the next kit up.
| Your roof deck measures up to | Kit to order |
|---|---|
| 1.8m × 1.7m | 2.1m × 2m — small office pod |
| 2.5m × 2.7m | 2.8m × 3m — typical 2.5m-deep garden office |
| 3.2m × 4.2m | 3.5m × 4.5m — 3m × 4m garden room |
| 3.9m × 5.7m | 4.2m × 6m — large studio or gym |
| 4.7m × 7.4m | 5m × 7.7m — annexe or double room |
All 14 sizes are listed in the selector above, each with the deck it fits. If you fall between two sizes, take the larger one. Surplus membrane trims off in seconds; a sheet 50mm short cannot be rescued.
Size and price my roof Our calculator prices every line for any shape, including L-shaped and pitched roofs.
Specification
| Material | EPDM (ethylene propylene diene monomer) synthetic rubber |
| Thickness | 1.0mm |
| Construction | Single-ply, supplied as one sheet, cut to size — no on-site joining required |
| Membrane colour | Black |
| Edge trim | 40mm × 75mm black powder-coated metal, all four edges, with four matching corners |
| Guarantee | 20-year product guarantee on the membrane |
| Life expectancy | Up to 50 years |
| Temperature range | Remains flexible from −40°C to +120°C |
| Standing water | Unaffected by ponding water |
| Suitable decks | OSB3, WBP plywood and other sound timber decking |
| Recommended fall | Flat and low-pitch roofs; minimum fall 1:80 to the draining edge |
| Fixing method | Fully bonded, cold applied — no heat or naked flame |
| Primer | Not required on sound timber decks |
| Minimum install temperature | 5°C and rising, dry deck, no rain forecast until cured |
| Sizes available | 14 sizes, 2.1m × 2m to 5m × 7.7m |
How it goes on
1. Prepare the deck
Strip any old covering, replace soft boards, punch every nail head below the surface and re-drive proud screws. Fill gaps wider than 5mm, confirm the falls run to the draining edge at 1:80 or better, then sweep the deck clean and let it dry completely.
2. Relax the sheet, then roller the adhesive
Unroll the membrane over the deck with an even overhang all round and leave it 30 minutes to lose its fold memory. Fold half back and roller the water-based deck adhesive onto the bare deck in a full, even coat.
3. Lay the membrane into the wet adhesive
Roll the folded half back down into the adhesive while it is still wet — this adhesive is not left to go tacky — and sweep it firmly from the fold outwards with a soft broom to drive the air out. Repeat for the other half.
4. Dress the edges
Run a bead of edge mastic along the top of each fascia, dress the rubber down over it and press it firm. Trim the surplus level with the bottom of where the trim will sit.
5. Fit the metal trims
Fit the four corners first, then cut the straight lengths to meet them. Screw through the face of the trim into the fascia at roughly 250mm centres, leaving a 3mm expansion gap at each joint. A bead of mastic behind the top lip of the trim keeps wind-driven rain out.
Free downloads — no email address needed
Written by our own team. Print them and take them up the ladder.
Metal trims, plastic trims or no trims?
| Black metal trims (this kit) | Plastic trims | No trims (shed kit) | |
|---|---|---|---|
| Look | Straight black shadow line, matches anthracite windows and cladding | Chunkier profile, can yellow or chalk in sun | Rubber dressed over the edge, plain |
| Edge protection | Rigid, holds the edge down in wind, resists ladders and knocks | Good, but flexes and can crack in frost | Relies on mastic alone |
| Fitting | Screws, corners supplied, no mitres | Screws, corners supplied | Nothing to fit |
| Best for | Garden rooms and offices you look at every day | Budget outbuildings | Sheds and stores |
What garden room owners say
“I put this rubber roof on my garden room, where it snugly fits like a glove and stands up admirably to rain. Expected some hassle with trimming the edges but happily, the metal trims made it straightforward enough.”
“It fits perfectly with the black metal edges and has kept everything dry in all sorts of weather. Delighted how straightforward it was to install, providing a sleek finishing touch to our space.”
“Got this for updating the roof on our south-facing garden room. Installing the kit was straightforward, with no fuss getting it down tight and neat. Handles both rain and intense sun well so far.”
Read all customer reviews · Rated Excellent by 1,000+ UK roofers on Trustpilot.
Delivery, dispatch and returns
- Free delivery to UK mainland addresses on every size — including the metal trims, which most suppliers surcharge.
- Dispatched within one working day — every membrane is cut to your size before it leaves.
- 1–3 working days on a tracked courier once dispatched. Trims travel in a separate rigid pack so they arrive straight.
- Made to measure — the membrane is cut to the size you order, so kits cannot be returned or exchanged once cut unless faulty. Faulty or damaged items are replaced or refunded in full.
- 20-year product guarantee on the membrane.
Frequently asked questions
Can I fit this myself?
Yes. The membrane goes down cold in one piece, the adhesive is a paint-roller job, and the trims screw on with the corners supplied. If you can measure a roof, sweep it clean and use a drill, you can fit this kit. The free manual covers every stage and you can phone us mid-job.
Which size do I need?
Measure the roof deck, add 300mm to each measurement (150mm per side), and order the kit closest to but not smaller than that figure. A 2.5m × 2.7m deck needs the 2.8m × 3m kit. Between sizes, go up — or WhatsApp us a photo and your measurements and we will confirm the size before you order.
Are the trims really metal?
Yes — 40mm × 75mm powder-coated metal, not uPVC. They stay rigid and straight, do not yellow or chalk in sunlight, and the black finish matches anthracite windows, doors and cladding. Four matching corner pieces are supplied so there is no mitring.
Is 1.0mm thick enough for a garden room?
Yes, for a free-standing garden building with no foot traffic. 1.0mm EPDM is the standard grade for sheds, summerhouses and garden rooms and carries the same 20-year guarantee. If the roof will be walked on regularly, has upstands against a house wall, or is over 5m × 7.7m, choose the 1.2mm garage kit or use the calculator.
Will the membrane have a join?
Every kit is supplied as one sheet at the size you order, so there is no on-site joining required — nothing to tape or overlap on the roof.
As with all EPDM sheet, larger sizes may contain a factory-made join formed under controlled conditions; these are covered by the product guarantee.
What exactly is included?
A 1.0mm EPDM membrane cut to your size, water-based deck adhesive, an application roller, bond and seal edge mastic, 40mm × 75mm black metal edge trim for all four sides, four corner pieces and all the screws.
My roof drains into a gutter — do I still use metal trim on that edge?
Better not. A flat metal trim can let water track behind the gutter. Tell us when you order and we will swap that edge for a gutter drip trim at the same price, which kicks the water out into the gutter.
How long does it take to fit?
A typical garden room roof takes a day: about an hour of preparation, 30 minutes letting the sheet relax, an hour or two to bond it, and two hours on the edges and trims. Allow longer for your first roof.
Does the deck have to be dry, and what weather do I need?
Yes. The deck must be completely dry and you want a dry day at 5°C or above with no rain forecast until the adhesive has cured. Water-based adhesive will not bond to a damp deck, and trapped moisture is the main cause of blisters under a new roof.
Can I lay it straight over old felt?
Sometimes, but stripping is better. Overlaying only works if the old felt is fully stuck down, flat, dry and free of mineral chippings. Stripping lets you see the boards and fix the soft ones first.
How long will it last, and is it guaranteed?
The membrane carries a 20-year product guarantee and has a life expectancy of up to 50 years. Felt on the same roof would typically need replacing two to five times over that period.
Does it cope with standing water?
Yes. EPDM is unaffected by ponding water, which suits garden rooms where the fall is often modest. Build in a fall of 1:80 or better anyway so the roof drains and stays clean.
Do I need a primer?
No. The water-based adhesive bonds directly to sound timber decking — OSB, plywood or planed board.
Which side of the membrane goes up?
EPDM of this type is the same both sides, so there is no wrong way up. Just make sure the side that touches the deck is clean and free of dust.
Can I walk on it once it is fitted?
For maintenance in soft-soled shoes, yes. It is not a walking surface for regular traffic — add walkway pads if you plan to use the roof — and never walk on it wet or frosty.
Can I put solar panels or a green roof on it?
Solar panels on a ballasted or frame system, yes, with a protection layer under any feet. A green roof needs the 1.2mm grade and a root barrier — ask us before you build anything heavy onto a garden room roof.
How much maintenance does it need?
Ten minutes a year: clear leaves and debris off the roof, and check the trim screws and corners after big storms. There is nothing to re-coat, treat or paint.
When will it arrive?
Every kit is dispatched within one working day, then 1–3 working days on a tracked courier. Delivery is free to UK mainland addresses, trims included.
What if I order the wrong size?
Tell us straight away. Every membrane is cut to your size to order, so once it has been cut it cannot be returned or exchanged unless it is faulty. If you contact us before the membrane is cut we can amend the size free of charge — which is why we would rather size it with you first.
Guides that go with this kit
- How to fit an EPDM roof on a shed or garden room — the full illustrated method
- Fitting edge trims — which trim goes on which edge
- Forming corners — folding rather than cutting
- Drainage and falls
- Types of EPDM membrane — 1.0mm or 1.2mm?
- The full EPDM Learning Centre
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