12 May 2026

EPDM or bitumen on your flat roof? The decision guide

The two common coverings side by side: price per m², installation, seams and maintenance — and which material wins in which situation.

If you are having your flat roof re-covered, in practice you choose between two materials. Bitumen is the familiar black roofing felt: rolled out in strips and torch-melted onto the substrate and onto itself. EPDM is a rubber membrane that is cold-glued and, on smaller roofs, often comes in one piece — so without seams. In price they differ less than often assumed: expect € 45 to € 90 per m² for bitumen and € 60 to € 110 per m² for EPDM, labour included.

The difference sits in the details of your roof. Bitumen wins on proven repairability: every roofer knows it, a damaged spot can be patched locally, and on roofs with many penetrations, corners and upstands the torched work can be fitted precisely. EPDM wins on the seamless surface: no torched overlaps that can open up after years, plenty of stretch when the substrate moves, and no open flame on the roof. Manufacturers make varying promises about lifespan and warranty — so have those terms put in writing per quote instead of trusting an average.

Rules of thumb per situation: a straightforward garage or shed without many penetrations is the natural EPDM roof (one piece, cold-applied, € 1,500-3,000 for the whole job); a large or irregular residential roof surface with many details remains strong bitumen territory. If gravel lies on the roof now, removing and disposing of it belongs in the quote. And in all cases: torch work is a fire-safety matter as well as craftsmanship — this is not a DIY job, and quotes that do not mention the company's fire insurance are a red flag.

Not sure whether the current covering is even due for replacement? Blisters, bare patches and loose seams are often visible yourself; a roof inspection (€ 150-350) gives the definitive answer with photos. The full rates for both materials are in the price index — and when replacing, weigh up right away whether to have the roof insulated: the roof is open anyway.