Garage, kitchen-extension and utility-room roofs sold as flat are really laid to a slight fall. Rain needs to run to a gutter or outlet, and when that fall is lost, water stands and shortens the life of the covering.
Q2.1How do I tell a repair from a replacement?
Press on the roof from a safe position or look at it from an upstairs window. If it is firm and the damage is local, repair is the likely answer. If the surface feels soft underfoot, water has probably reached the deck, which is the board beneath the covering, and a patch on top will not last. Ponding that dries within a day or two is less alarming than water that is still there days later.
Q2.2Which flat roof coverings are common?
You will meet three. EPDM is a synthetic rubber sheet, usually supplied as a single piece cut to the roof. GRP, glass-reinforced plastic, is the fibreglass option, and felt means bitumen sheet, commonly torch-on. Typical lifespans in the national guides are 20 to 30 years for EPDM and 25 to 40 years for GRP, and the sources disagree about felt, so we treat any figure as a guide and not a promise. Our flat roofing page goes through the options.
Q2.3What decides the cost?
Size, access, the state of the deck and the covering you choose. Whether a scaffold is needed, and whether a quote includes VAT, change the total, so ask every firm about both. The quote we send in writing after the survey gives one total price.
If the roof is leaking while you wait for a visit, move belongings away from the wet area and tell us. A roof that is actively leaking gets our attention first, with the water stopped before the lasting repair is planned.