The roof shown in Fig. 72 is called a "gable," or "V" roof. This is the easiest roof to build, next to the shed roof, and for small dwellings the most practical roof.
The type of roof shown in Fig. 73 is called a grambrel," or "curb" roof; it is very commonly seen on the buildings of the
Colonial period, and was evidently adopted because of its giving ample attic space, without the great height of the V roof. It is best adapted to comparatively wide buildings with finished attics. For the same span it requires less lumber and covering material than the V roof, while it gives about the same amount of available space inside.
When the roof slopes back from the ends of the building, the same as at the sides (see Fig. 75), it is called a "hipped" roof, and when it terminates in a flat roof, as in Fig. 74, it is called a " deck " roof.
Considering the saving in the gable walls, a hip roof is cheaper than a gable roof, and when the width of the building is over 30 feet a deck roof is still cheaper. Hip and deck roofs are most commonly used on large buildings. Mansard roofs are often used on large dwellings, and also on hotels and office buildings.