Whether a roof was drawn manually or automatically generated, deleting roof planes is easy.
If a warning message appears that roofs cannot be deleted while Auto Rebuild Roof is on. Click the Yes button to turn off Auto Rebuild Roof and delete the roof.
|
Chief Architect www.chiefarchitect.com |
parent button, then Delete Roof Planes 
.
and in the Delete Objects dialog, select All Rooms; place a check beside Roof Planes; and click OK.