Roof

A roof is an architectural feature of a building.

The Sims
In The Sims, a roof would automatically be generated when an area enclosed by walls was open at the top. Players could select a roof pitch and roof texture, which would be applied to all buildings on the lot. Beginning with The Sims 2, players had to add the roof themselves when building.

The Sims 2
In The Sims 2, there are several types of roof to choose from. There are the Hip, Gable, 3-Hip, and Half-Hip with the base game. Other expansions add Domes, Cones, Octagons, Pagodas, and Mansard. All of these, except for Mansard, are available in the Roof Section of Build Mode. Mansard is made by using pieces found in the Architecture Section.

The Sims 3
Could some1 add to this?