Intersect Single-plane Roofs

You may need to adjust Single-plane roof panes to each other.

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To have these two roof planes intersect:

Select one of the Roofs on the Floor Plan, and Ctrl-click (Windows) or Cmd-click (Mac) the ridge line of the other.

//helpcenter.graphisoft.com/wp-content/uploads/ac21_help/03-1-elements-virtual-building/IntersectRoof1.png 

Now select the other roof plane and Ctrl-click (Windows) or Cmd-click (Mac) the ridge line of the lower one.

//helpcenter.graphisoft.com/wp-content/uploads/ac21_help/03-1-elements-virtual-building/IntersectRoof2.png 

The two faces have been adjusted to each other.

//helpcenter.graphisoft.com/wp-content/uploads/ac21_help/03-1-elements-virtual-building/Intersection_result.png 

See also Cropping with a Remote Roof.

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