Plans for gambrel roofs and buildings with gambrel roofs are available for free at various websites, such as the North Dakota State University site. Gambrel roofs are often found on buildings such as residential homes, sheds, barns and garages.
A gambrel roof has a unique design that distinguishes it from other roof styles. Most roof designs have a single pitch, but a gambrel roof has two pitches. The first pitch, which slopes up from the bottom, has a steep pitch. As the roof approaches the ridge, however, the pitch becomes shallower. The main advantage of a gambrel roof is that it provides more space for a building's upper stories.