Auto build roof does not build over structure, but creates false roof

[Clark418]

When I attempt to auto build my roof over a two story, multi-level house.  I cannot get the roof to build, but I get a false roof off to the side with an unusual shape.  There is nothing I can identify under the false roof.  What am I doing wrong?Frame House Slopped Roof r1_2025_08_02.zip

[robdyck]

You have a Baseline Polyline in your plan, it just isn't displayed in the working plan view nor in the roof plan view. Turn on the layer for Roofs, Baseline Polylines. Then, select and delete the roof baseline polyline.

OR open the Build Roof Dialog and check Make Roof Baseline Polylines. This will generate a new baseline polyline and the correct roof, but it will not rebuild when walls are moved as that check box is not 'sticky'. Best to delete the baseline and don't use a baseline unless you understand its function and need it for roof edits.

[Clark418]

Thank you I would have never figured it out.