Message: Cannot Produce a Roof Plane

Reference Number: KB-02911
Last Modified: July 16, 2015

The information in this article applies to:

Chief Architect Premier or Chief Architect Interiors

Home Designer Professional or Home Designer Architectural or Home Designer Suite or Home Designer Interiors or Home Designer Essentials


When I use the Build Roof dialog to create an automatic roof, this message displays:

"Cannot produce a roof plane."

What is causing this problem?


When a roof is generated automatically in Chief Architect, the program will try to build a roof plane bearing on top of each exterior wall in the plan, excluding Full Gable and High Shed/Gable walls. The program will also join each roof plane with adjacent roof planes, forming geometrically correct valleys, ridges and hips. When conditions in the plan prevent the program from doing this in any part of the plan, it will present this warning message.

There are a wide variety of reasons why this warning message might display.

One common reason is that floor and ceiling heights in some part of the plan are such that the program cannot create roof planes over that area and have them join properly to the roof planes in the rest of the plan.

To use the Reset to Defaults dialog

* The following steps apply to Chief Architect and Home Designer Pro only.

  1. Click File> Save from the Menu to save your work.

  2. Select Build> Roof> Delete Roof Planes from the menu to remove existing roof planes from the plan. 

  3. Next, select Edit> Reset to Defaults from the menu.

  4. In the Reset to Defaults dialog

    • Click the radio button beside All Floors.

    • Check the boxes beside Floor Heights and Ceiling Heights.

    • Click OK to close the dialog and restore these defaults throughout the plan.

If this does not resolve the issue, or if you would like more information about the cause of this warning in a particular plan file, contact Chief Architect Technical Support.