The Roof Type controls the appearance of the roof of a house inside the building’s boundaries. It is selected from the House dialog box , which can be accessed from the house icon 
. The current roof type is remembered between houses. When you are ready to insert the selected a house, click on the Insert button.
Roof Type 1 (Gabled)
The first type creates houses with a sloping roof, which have gables. This roof type affects all house shapes a part from type 8 (many-sided roof.)
Roof Type 2 (Hip Roof)
This creates a roof with a Hip roof instead of a gabled roof. The angle of this section is determined by the current Roof Options for this type on the House Settings dialog box.
Roof Type 3 (Central Point)
This only affects the basic house shape (type 1) and the four-sided irregular house type (shape 8). It creates a roof that slopes up on four sides to a central point. Other house shapes give a Hip Roof.
Roof Type 4 (Flat Roof)
This creates a house with hip roof edges sloping up to a flat area. It works with all house shapes. The color of the roof is controlled by the Flat Roof Color of the current house setting. The distance between the edge of the roof and the flat area is controlled by the Roof Options for this type in the current house settings. This can be used to make Arabic style buildings and those with roof gardens.