examples of roofs [1]
Roof: the covering of a building that rests on the frame and protects it from inclement weather.
lean-to roof 
Roof with one side only, usually covering a building that is supported by a higher building.
hip roof 
Roof composed of two triangular sides (hips) and two trapezoid sides.
gable roof 
Sloping roof whose peak angle is very sharp.
pitched roof 
Roof with two inclined sides whose peak angle varies.