Are you in the process of designing or building a new house or framing a roof? if so, chances are you are considering one of the two most popular roof types in the us. Homeowners with flat roof homes often find themselves in a situation where their roof starts to leak rather unexpectedly – i.e. only after a few years since it was. Learn about the pros and cons of different flat roof options including built-up roofing, single-ply membrane roofing and modified bitumen roofing..