This tool provides many features for creating roofs.

• When creating a roof, you first draw a shape to define the roof footprint. Usually this is done in a top or isometric view. The roof also uses the ACS, enabling you to place an entire roof envelope on an angle.
• For sloped roofs, you identify which lines in the footprint define the roof pitch.
• Forms slope away until they intersect the plane of another roof or an edge of a roof footprint, forming a ridge. Base lines which intersect other base lines, extend sideways to meet the roof formed by the neighboring line. This forms hips and valleys in the roof.
• There are times when you place roofs and then change the slope of a certain plane, or change the sides of the roof that have slope. This utility enables you to make changes to the slope of a roof. The ridges and valleys of the roof are updated during the process.
  
  
  

  This sloped roof is constructed as one roof. All segments and subparts share the same function, material, and envelope.

• The roof form can be extruded down from the top, or up from the bottom, and this also displays in the tool settings Preview box.
• All the forms inside a roof envelope have the same assembly. For example, all the joists in a flat wood roof would share the same construction and material.
• A roof that has two sloped perimeters at different elevations would have to be constructed differently. This requires two roof constructions and two separate envelopes, one for each sloped perimeter.
  
  
  
• When a design calls for a roof to be constructed of different materials such as wood and steel, the wood roof portion and the steel roof portion are modeled as two different roofs with two different envelops.