It has been said that roofers install flat roofs so they can forever charge for repairs! A flat roof is just as it sounds, flat. These roofs in residential construction usually are prone to leaks at all penetrations, wear quickly and may sag. This type of roof installation is fast and inexpensive. Many extensions are constructed using either a flat or shed-style roof because non- professionals install them and framing is simple to manage. Flat roofs are often an inspector's biggest concern when they arrive at the home. Your inspector will suspect problems related to them before they see the roof or the inside of the home because flat roofs almost always leak. Many flat roofs are abandoned after frustration and expense over years and a gable roof is installed right over them.