Description
Garden Room EPDM Rubber Roof Kit
The UK's Most Complete Flat Roofing Kit — Everything You Need, Nothing You Don't
Specify your exact roof dimensions, select your trim colour, and receive a precision-cut, single-piece EPDM rubber membrane with every component needed for a watertight, professional finish. Designed specifically for free-standing garden rooms and outbuildings where the gutter runs along the longest edge — this is the kit roofing contractors actually use.
What's Included in Your Kit
| Component | Detail | Purpose |
|---|---|---|
| EPDM Rubber Membrane | 1.2mm thick, single-piece, cut to your kit size | Primary waterproofing layer — no joins, no seams |
| Water-Based Deck Adhesive | Solvent-free, low-odour bonding adhesive | Bonds membrane to the full timber deck surface |
| Contact Adhesive | High-tack perimeter bonding adhesive | Bonds membrane at roof edges & under trims |
| Kerb Edge Trim (x3 sides) | Sure Edge aluminium kerb trim, pre-cut lengths | Clean, weather-tight finish on three upstand sides |
| Gutter Drip Trim (x1 long side) | Sure Edge aluminium drip edge trim | Directs water flow into gutter — prevents fascia rot |
| External Corner Trims | 4 x Sure Edge pre-formed external corners | Neat, professional corners — no cutting required |
| Installation Tool Kit | Heavy scissors, seam roller, mini detail roller | Professional consolidation and trimming tools |
| All Fixings & Clips | Full complement of trim clips, pins and fixings | Secure mechanical fixing for all perimeter trims |
Technical Specification
| Membrane Material | EPDM (Ethylene Propylene Diene Monomer) rubber |
| Membrane Thickness | 1.2mm |
| Membrane Format | Single-piece (no joins, no seams, no vulnerable overlaps) |
| Membrane Colour | Slate / Lead Grey |
| Trim Colours Available | Black | White | Anthracite Grey |
| Expected Lifespan | 50+ years (when installed correctly on a sound substrate) |
| Temperature Range | -45°C to +120°C — remains flexible in all UK weather |
| UV / Ozone Resistance | Fully UV, ozone and infrared stable — will not crack, blister or peel |
| Suitable Roof Pitch | Flat or low-pitch roofs (0° to 10°) |
| Suitable Substrates | OSB3, S-Grade Plywood, concrete deck |
| Kit Sizing Note | Membrane supplied at kit dimensions. Your actual roof deck must be approx. 150mm smaller on each side to allow for edge overlaps. Example: a 4m x 4m kit fits a roof deck up to 3.7m x 3.7m. |
Why EPDM Outperforms Every Other Flat Roofing Material
There is a reason why professional roofing contractors across the UK have moved away from felt and bitumen systems. EPDM rubber is not a new material — it has been specified on commercial flat roofs for over 60 years — but it is now the benchmark for residential and garden building roofing too. Here is why:
Zero Seams, Zero Weak Points
Supplied as a single piece cut to your roof. Traditional felt uses overlapping sheets — every overlap is a potential leak. EPDM eliminates this entirely.
50-Year Proven Lifespan
Quality felt degrades in 10–15 years, especially under UV and standing water. EPDM retains its waterproofing properties for decades with zero maintenance.
Remains Flexible in UK Winters
EPDM stays pliable to -45°C. Felt and some GRP systems become brittle in cold weather, causing cracks. EPDM simply moves with the structure.
No Cracking, Blistering or Peeling
Fully UV, ozone and infrared stable. The membrane will not crack, blister, or peel regardless of how many seasons it sees.
Environmentally Responsible
EPDM is non-toxic, contains no heavy metals, and is fully recyclable at end of life. The water-based deck adhesive in this kit is solvent-free and low odour.
DIY-Friendly Installation
No hot works, no naked flame, no specialist equipment. If you can paint a floor, you can install this roof. Most garden room kits are completed in a single day.
Ideal Applications
This kit is configured for free-standing garden structures where the gutter runs along the longest edge. Suitable for:
Installation Overview
No specialist roofing experience required. Follow these four steps for a professional result:
Prepare the Deck
Ensure your OSB3 or plywood deck is clean, dry, smooth and structurally sound. Fix any protruding fixings and remove all debris. A poor deck is the most common cause of installation problems — take your time here.
Apply Adhesive
Roll the water-based deck adhesive across the entire substrate. Apply contact adhesive to the perimeter 300mm zone on both the deck and the underside of the membrane. Allow to tack off before bonding.
Lay the Membrane
Position the single-piece membrane across the roof with equal overhang on all sides. Work from one end, pressing and rolling down firmly using the included roller to eliminate air pockets. Bond the perimeter edges firmly using the seam roller.
Fix the Trims
Fit the Sure Edge gutter drip trim along the low front edge, then the kerb edge trims on the remaining three sides. Click in the pre-formed external corner pieces, then clip and pin all trims using the included fixings. Trim any excess membrane flush. Your roof is complete.
Not Sure Which Size You Need?
Select the kit size that matches or exceeds your roof dimensions. Your deck must be approximately 150mm smaller per side than the kit size to allow the membrane to overlap the edges and bond correctly. If your roof is an unusual size or you have a complex layout, contact our team before ordering — we're happy to advise.
Call us: 02031510153 | Email: sales@rubberroofuk.uk | Mon–Fri 08:00–17:00
Storage Note: If you are not installing immediately, unroll and re-roll the membrane lengthways to prevent crease formation. Store adhesives and trims indoors — temperature fluctuations affect performance before installation.
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Frequently Asked Questions
Expert answers about the Garden Room EPDM Rubber Roof Kit
What's included in the garden room roof kit?
You'll receive the EPDM rubber membrane cut to the exact size of your garden room roof, water-based deck adhesive, contact adhesive, kerb edge trims, a gutter drip trim, external corner trims, an installation tool kit, and all fixings and clips, giving you a complete, watertight system in one order.
Is this suitable for larger roofs like garden rooms and outbuildings?
Yes, this kit is available in a full range of sizes up to 6.5m x 7m, and EPDM rubber can be supplied as a single sheet for most garden rooms with no joints needed, even on larger roofs.
Can I install this myself?
Yes, this kit is designed for DIY installation, and full step-by-step instructions are included. For larger garden room roofs, having a second pair of hands makes the job easier, but no specialist skills are required.
How should I store the membrane before installing it?
If you're not fitting it straight away, unroll and re-roll the membrane lengthways to stop creases forming, and keep adhesives and trims stored indoors, as temperature fluctuations can affect their performance.
How long will an EPDM garden room roof last?
EPDM rubber roofing lasts 50+ years with no need for recoating, making it one of the most durable and low-maintenance options for a garden room roof.
Do I need to buy any extra tools or sealants separately?
No, this kit includes everything you need: membrane, adhesive, primer, trims, and an installation tool kit with a seam roller and detail roller. You'll just need basic tools such as a broom and a sharp trimming knife.
How do I know what size kit to order for my roof deck?
Select the kit size that matches or exceeds your roof dimensions. Your actual roof deck should be approximately 150mm smaller per side than the kit size, so a 4m x 4m kit suits a deck up to roughly 3.7m x 3.7m.
What is the gutter drip trim for, and do I need it?
The gutter drip trim fits along the longest, lowest edge of the roof and directs water flow into the gutter, preventing fascia rot. This kit is specifically configured for free-standing garden structures where the gutter runs along the longest edge.
What roof pitch and substrates is this kit suitable for?
It's designed for flat or low-pitch roofs between 0° and 10°, and is compatible with OSB3, S-grade plywood, and concrete deck substrates.
Will the trims match my garden room's existing colour scheme?
The edge trims are available in black, white, or anthracite grey, so you can choose the option that best complements your garden room's design.
What if my roof is an unusual size or has a complex layout?
Contact our team before ordering with your dimensions, and we'll be happy to advise on the right kit size or configuration for a non-standard roof.
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