examples of roofs [3]
Roof: the covering of a building that rests on the frame and protects it from inclement weather.
mansart roof 
Four-sided roof whose slope is gentle at the summit and steep at the base.
imperial roof 
Roof with curved sides that resembles a crown.
sawtooth roof 
Roof composed of a series of small roofs with two asymmetrical sides, the steepest of which often contains a window.