A flat roof is only as good as the person laying it. The materials themselves — good-quality EPDM, high-performance modified-bitumen felt, GRP fibreglass — will comfortably run 20 to 30 years. What fails first is the detailing: the upstands, the corners, the outlets, the joints. That is where a proper installer earns their fee.
White Horse Roofing installs and repairs flat roofs across Oxfordshire, Berkshire and the Cotswolds. Extensions, dormers, garages, porches, outbuildings — all systems, all sizes, all backed by a written 10-year workmanship guarantee.
Who it's for
Homeowners with a flat-roof extension, garage, dormer or porch that is leaking, ponding, blistering or approaching the end of its life. Homebuyers whose survey has flagged a failing felt roof. Landlords who need a documented, warrantied replacement rather than another year of patching.
When it's needed
As soon as you see ponding after rain, splits or blisters in the surface, moss growing on the covering, or water staining the ceiling below. Once a flat roof is admitting water, deterioration accelerates rapidly — the deck below saturates and rots, and a straightforward re-cover becomes a full strip-and-rebuild.
Why professional
Flat-roof failure is almost always a detailing failure — a badly formed upstand, a joint that was not welded fully, an outlet without adequate fall. Manufacturer warranties on EPDM and GRP are only valid when installed to specification by a competent tradesperson. DIY felt roofs and unqualified fitters routinely void those warranties on day one.
