Flat roofs usually come with a 10- to 20-year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules.

•  Installation of flat roofs is quicker and easier. 

•  There are fewer damage and repair costs over the lifespan of the roof.

•  Installing things like solar panels, which save on electricity, and satellites—making repairs and cleaning gutters less expensive and easier to accomplish on flat roofs.