22+ Flat Roof House Pros And Cons Pics. It has a very low slope—between 1/4 to 1/2 inch per foot—so that it drains water. Even better, many times a flat roof itself can be.
Materials, cost, pros & cons. It's an extra space for. The most obvious advantage for flat roofs is the cost:
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It's an extra space for. We weigh all the options for new flat roof materials. They wear better than older material, but they cost more, too. The materials are cheaper, as they don't need to have as much curb appeal;