Flat roofing is the most economical and durable roofing structure that is very popular in US. There are many types of flat roofing like built up roof, modified bitumen, rubber membrane etc. BUR looks great on windows and decks and is cheaper. Whereas, modified bitumen are affordable and good energy savers. Rubber membrane is easy to install and good fire resistant. Different roofs have their own advantages and drawbacks. The home owners can opt any of the styles depending on their requirements.
Overall flat roofs are cost effective, have smaller surface area, require less material, stronger than pitched roofs and its maintenance is easy. Here is an infographic that illustrates flat roofs, flat roof structure, construction, components, advantages and drawbacks.