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JLC ??MAY 1991 FLAT ROOF REPAIR GUIDE It takes detective work to locate leaks and a thorough knowledge of membranes to patch them Most general contractors don't have the experience or the tools to diagnose and repair flat roof problems. In most cases, it's best to sub the work out to a local roofing specialist. But it's helpful to have enough knowledge on the subject to converse with the roofer or to advise the owners on the best course of action. Plenty of good roofs are ruined by misguided repair efforts or by incompetent tradesmen who cut a lot of holes and smear on a lot of goop without understanding the system they're working on. There are many different types of flat roof