EPDM rubber roofing has revolutionised flat roof installations across the UK, offering homeowners and tradespeople a durable, cost-effective alternative to traditional felt roofing to transform shed, garage, or extensions into a watertight structure with a life expectancy exceeding 50 years.
But with this new material comes confusion as to what exactly is needed for an installation, and the demand is now growing for comprehensive EPDM rubber roofing kits. We take a look at what's available.
First, What is EPDM Rubber Roofing?
EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane designed specifically for flat roof applications. This single-ply roofing system uses a cold-applied installation method, eliminating the need for dangerous naked flames or hot bitumen. The membrane arrives in one-piece sheets, reducing seams and installation time whilst creating a completely waterproof barrier for your roof deck.
The rubber membrane demonstrates exceptional flexibility, remaining pliable at extreme temperatures from -40°C to +40°C, which allows it to accommodate significant building movement and temperature fluctuations. This flexibility, combined with unmatched resistance to UV radiation and ozone, ensures long-term performance in the UK's challenging weather conditions.
What EPDM Roof Kits Are Available
EPDM roof kits are available for simple structures such as shed roofs, as these generally have a fixed range of sizes. (see shed roof kits below)
For extensions, garden buildings and other applications however, it's harder to provide off the shelf kits due to the myriad of sizes that would be required.
The solution? Cut to Size EPDM
At Flat Roofing Supplies we supply cut to size EPDM so you can have a bespoke membrane tailored to your project. This allows you to build your own EPDM Kit.
Available in a choice of 1.14mm, 1.2mm or 1.52mm thicknesses, simply select the nearest width from the options from 0.55m to 12.2m, then input the length your require .
If you need any help, call us on 01622 962412 (Mon-Fri 7AM-5PM) or email shop@flatroofingsystems.co.uk
What Do You Need In Your EPDM Roofing Kit?
Standard Kit Components
Your complete EPDM roofing kit should contain all the essential materials for a professional installation. Everything from the
- EPDM rubber membrane forms the waterproof covering
- Water-based deck adhesive that bonds the membrane to your roof deck. Allow approx. 4m² per litre coverage.
- Contact Bonding Adhesive for bonding membrane perimeters, upstands, and detailing areas. Allow approx 2m² per litre coverage.
- Gutter trims for the sides where water runs off
- Drip Edge trim for the remaining sides to create a neat finish
- External corner profiles for corner detailing,
- Flashing trim (to existing wall abutments)
- EPDM seam tape (if roof area is large and requires sections to be jointed)
- Un-cured flashing tape - for sealing around penetrations and outlets
- Cured flashing tape for sealing in trims
Tools:
- An adhesive roller ensures proper bonding - a medium pile paint roller and pole will do the job.
- Seam roller (if your roof area is large and requires joints)
- Soft broom
- Stanley knife for trimming EPDM & tape
Membrane Thickness Options
We have a choice of 1.14mm or 1.2mm standard grade rubber membrane, suitable for domestic flat roof projects including sheds, garages, and extensions. Premium grade 1.52mm membrane is available for heavy-duty installations, green roofing projects, or commercial applications requiring additional durability.
Key Benefits of EPDM Rubber Roofing Kits
Exceptional Life Expectancy
EPDM rubber roofing delivers a life expectancy of more than 50 years, significantly outperforming traditional felt roofing which typically requires replacement every 10-15 years. Manufacturers back this longevity with guarantees ranging from 20 to 25 years, reflecting confidence in the membrane's proven worldwide performance.
Cost-Effective Solution
The low life-cycle cost makes EPDM an economical choice for flat roof applications. Whilst initial material costs may appear higher than felt, the extended life expectancy and minimal maintenance requirements deliver substantial long-term savings. The rubber membrane requires little or no maintenance over its lifespan, eliminating recurring repair costs.
DIY-Friendly Installation
EPDM roofing kits are designed for straightforward installation, requiring no previous roofing experience. The cold-applied system uses water-based adhesives rather than dangerous hot bitumen or naked flames, making it safe for DIY enthusiasts. Single-sheet membrane delivery reduces seams and simplifies the installation process, whilst comprehensive fitting instructions guide users through each step.
Superior Weather Resistance
The rubber membrane provides 100% water resistance over the long term, creating a completely watertight seal for your roof deck. Its exceptional UV stability and ozone resistance prevent degradation from sun exposure, whilst the flexible nature of EPDM allows elongation of more than 300% to accommodate building movement without cracking or splitting.
Environmentally Friendly
EPDM rubber roofing has limited environmental impact during manufacturing and throughout its use. The membrane is fully recyclable, and its energy-efficient properties help reduce building heat loss. This sustainable roofing solution aligns with modern environmental standards whilst delivering outstanding performance.
Ideal Applications for EPDM Rubber Roofing Kits
EPDM rubber roofing kits excel across numerous flat roof applications throughout the UK.
Shed & garden building roof kits
Shed & garden building roofs represent one of the most popular uses, with dedicated shed kits starting from compact sizes perfect for garden storage. Garage roofs, whether single or double, benefit from the membrane's durability and weather resistance.
Flat roof extensions, garden rooms, and garden offices increasingly utilise EPDM for reliable waterproofing. Porch and bay window roofing, dormer roofs, and orangeries all suit EPDM installation, with specialist kits available for each application. The membrane even works for gutter lining, providing a waterproof barrier in aging or damaged guttering systems.
For more info on EPDM shed roof kits, click here.
Building Your Own EPDM Roofing Kit
Calculating Your Requirements
Accurate measurement is essential for ordering the correct EPDM roofing kit. Measure your roof deck length and width, then add 300mm to each dimension to allow adequate overhang for trim installation. From there, calculate the length & width of EPDM needed.
Trim Colour Selection
Next decide on trim colour. Black trims provide a traditional appearance that blends with darker roofing materials and aged buildings. White trims create a crisp, modern look suitable for contemporary extensions and garden rooms. Anthracite grey offers a neutral compromise, working well with various architectural styles.
Membrane Grade Selection
Standard grade 1.14mm or 1.2mm rubber membrane suits most domestic flat roof applications including sheds, garages, porches, and residential extensions. This thickness provides excellent durability and weather resistance for typical UK roofing projects. Premium grade 1.52mm membrane delivers enhanced puncture resistance and longevity for commercial installations, heavy foot traffic areas, or green roofing systems where additional protection is required.
If you need any help working out the material for your project, please give us a call on 01622 962412 (Mon-Fri 7AM-5PM) or email shop@flatroofingsystems.co.uk and one of our staff will be happy to assist you.
Installation Tips for Success
Surface Preparation is Critical
The single most important factor for successful EPDM installation is proper surface preparation. Ensure your roof deck is completely dry before applying any adhesives – moisture trapped beneath the membrane compromises bonding and can lead to future problems. Take time to thoroughly clean the deck, removing all dirt, dust, and debris that could interfere with adhesive performance.
Allow Proper Relaxation Time
Never rush the membrane relaxation phase. EPDM rubber contracts and expands with temperature changes during storage and transportation. Unroll the membrane and allow it several hours to return to its neutral state before beginning adhesive application. This patience prevents tension issues and ensures the membrane lies flat without pulling at edges or corners.
Work Methodically with Adhesives
Apply water-based adhesive evenly across the roof deck, maintaining consistent coverage for reliable bonding. Keep adhesive away from edges as specified, leaving room for the stronger contact adhesive application later. Work in sections you can comfortably manage, folding back only half the membrane initially to maintain control during installation.
Use Primer When Necessary
Some roof deck surfaces benefit from primer application before bonding the rubber membrane. Porous substrates, older roof decks, or certain materials may require primer to enhance adhesive performance and create a stronger bond. Check manufacturer recommendations for your specific roof deck type and consider primer as cheap insurance for long-term success.
Seal All Penetrations Properly
Drain outlets, pipe penetrations, and roof details require careful attention using appropriate flashing materials and sealant. These vulnerable areas are common sources of leaks if not properly sealed. Use specialist EPDM flashing tape and generous applications of sealant to create weathertight seals around all roof penetrations.
Maintenance and Care
EPDM rubber roofing requires minimal maintenance throughout its 50+ year life expectancy. The membrane's inherent durability and weather resistance mean it continues performing without regular intervention. However, periodic inspection helps identify any issues before they develop into problems.
Remove debris, leaves, and dirt from the rubber surface using a soft brush or broom. For more thorough cleaning, wash the membrane with warm water and mild detergent, rinsing thoroughly afterwards. Avoid harsh chemicals or abrasive cleaning tools that could damage the rubber surface. Check drain outlets regularly to ensure water flows freely without blockages.
Inspect flashing, edge trim, and sealant annually for any signs of deterioration. These components may require attention before the membrane itself needs replacement. Address any minor repairs promptly using compatible EPDM repair materials to maintain the roof's watertight integrity.
Rounding Up
EPDM rubber roofing kits represent the modern solution for UK flat roof applications, combining exceptional durability with straightforward installation. The rubber membrane's 50+ year life expectancy, minimal maintenance requirements, and superior weather resistance make it the cost-effective choice for sheds, garages, extensions, and commercial projects.
The comprehensive nature of EPDM roofing kits simplifies the ordering process, providing everything needed including membrane, adhesives, trims, sealant, and fixings in one tailored package. Cold-applied installation using water-based adhesives makes these kits accessible to DIY enthusiasts whilst reducing installation time for professional roofers. With proper surface preparation and methodical installation, EPDM rubber roofing delivers decades of reliable, watertight performance for your flat roof deck.
