EPDM, GRP or Felt: Comparing Flat-Roof Systems Clearly
All three can suit the right roof. The better choice depends on roof shape, deck, movement, details, access and the installer's complete system specification.
All three can suit the right roof. The better choice depends on roof shape, deck, movement, details, access and the installer's complete system specification.
EPDM rubber
EPDM is flexible and can cover many simple roofs in a large sheet. Edges, outlets and penetrations still need careful system details.
GRP fibreglass
GRP creates a rigid seamless finish on a correctly prepared deck. Deck movement and dry application conditions matter.
Layered felt
Modern felt systems build waterproofing in layers and can handle many roof shapes. Safe application and sound laps are essential.
How to choose
Ask what suits the roof shape, how the deck will be prepared, how water leaves and what details are included.
Questions about this topic
Can roof photographs answer every question about flat-roof systems?
No. Clear photographs help, but hidden underlay, fixings, deck and water routes may still need close inspection.
Should I inspect flat-roof systems by climbing onto the roof?
No. Roof work is dangerous even when the check seems quick. Photograph flat-roof systems from ground level or a safe window and leave close access to trained people with the right equipment.
When should I request a written quote for flat-roof systems?
Ask for a written quote after flat-roof systems and the access needs have been assessed. It should set out the work, materials, exclusions and any likely extras.