Extending a Roof Downward Over a Bumpout

Reference Number: KB-00096
Last Modified: April 8, 2022

The information in this article applies to:

Chief Architect Premier or Chief Architect InteriorsHome Designer Professional or Home Designer Architectural or Home Designer Suite


I am receiving the following warning:

"A wall designated "extend slope downward" must connect at each end to two perpendicular walls that extend from it in the up roof slope direction. Each of these walls must be designated a "full gable wall""

How can I stop this from displaying in my plan?

Real time ray trace perspective overview showing a roof extending down over the entry door bumpout


Only select the "Extend Slope Downward" setting to extend the roof plane downward over a bumpout. The two connecting walls that create the bumpout must also be set to be "Full Gable Walls".

In the following image, the bearing wall of the bumpout has "Extend Slope Downward" checked. The two short side walls are "Full Gable Walls".

Plan and Perspective View showing the Full Gable walls and the Extend Slope Downward wall at the edge of the bumpout

To eliminate the warning

  1. Using the Select Objects  tool, select the incorrectly defined wall or railing.

  2. Click on the Open Object  edit button to display the Wall Specification dialog.

  3. On the Roof panel, select an option other than Extend Slope Downward, then click OK.