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GRP vs EPDM vs felt roofing
Choose a flat roof system from your inspected deck, roof shape and junctions. GRP, EPDM and felt need different specifications, so ask Adam to compare complete build-ups and repair options before you decide from a material name or headline price.
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Adam gets on the roof, photographs what he finds and sends you a written quote.
Expert RooferVerified memberIndependent platforms
September 2026
Compare the roof before the material
Start with the existing roof and why you are considering work. A leak at a wall junction, a damaged covering and a defective deck are different findings. Adam inspects the accessible components and explains the proposed scope with photographs and a written quote. That gives the material discussion a purpose: the selected system needs to be specified for the roof and work in front of you. Ask which layers can stay and which need replacing. You can then compare GRP, EPDM and felt proposals on the same basis instead of assuming that a familiar material name guarantees a complete or suitable specification.
What a GRP proposal needs to name
A GRP specification needs the deck, glass reinforcement, resin, trims and topcoat described together. The wall upstands and drainage outlets are part of that assembly rather than finishing details to be left unexplained. Ask Adam which system is proposed and how its components will be used around your roof's junctions. GRP installation and repair are carried out by our fully insured roofers. GRP fibreglass systems carry a 25-year manufacturer guarantee. If a product warranty is offered for your job, ask for the actual written terms and check that the named material matches the specification you are being quoted.
What an EPDM proposal needs to name
An EPDM roof uses a rubber membrane with its specified attachment and junction materials. Ask how the membrane meets the deck, walls, edges and outlets, and whether any seams are included in the proposed layout. Deck repairs and insulation need their own lines in the build-up. Adam's written explanation needs to show the proposed attachment and perimeter detail, with retained components distinguished from replacement items in the quote. Do not assume that every rubber-roof price includes new decking or the same perimeter work. Compare those components directly with the GRP or felt proposal you are considering for the same roof area and the same observed defects.
What a felt proposal needs to name
A felt quote needs to identify its layers and outer cap sheet, together with the supporting deck and junction details. If a torch-on cap sheet is proposed, ask for the selected system and application method to be stated rather than inferring the whole build-up from that outer layer. Ask Adam to explain where the layers finish at the perimeter and which components form the wall upstands and outlets. Check any product warranty against the named system and its actual written terms. Use the specification for your own roof to compare it with the other proposals, including retained layers, decking, insulation, access and the complete perimeter work.
Keep insulation and repair scope visible
The outer material choice does not answer whether the roof will include new insulation. Warm roof construction is work our fully insured roofers carry out and needs a complete build-up described in its own right. Ask Adam to show the deck, moisture-control layers, insulation and covering in order, then account for the height at upstands and outlets. Also ask whether the current defect has a local repair option before booking replacement. A repair and a new insulated roof are different jobs, even if both mention EPDM or GRP. Keep the scope clear so you are comparing the proposal you actually want rather than two prices for different assemblies.
Make the decision from the specification
The useful decision comes from the inspected roof, the complete build-up, the junction details and the terms attached to the named product. Adam provides photographs and a written explanation so you can ask about those points before choosing. Check that access and any deck work are included consistently across the quotations. Keep manufacturer warranties separate from workmanship promises and ask for documents rather than headline durations. You then have a practical basis for selecting a roof system, with the components and work defined for your home instead of a material label chosen in isolation.
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Get your roof inspected
Photographs and a free written quote from Adam. Fully insured, with a 10-year workmanship guarantee on all work.
Free, no obligation, and the photographs are yours.