To create a dormer model required walls and additional roof.
Revit joining exting and new roof.
Summary 1 unjoin the roof 2 create a reference plane 1 away from the edge of the second roof 3 edit the footprint of the unjoined roof.
Align one edge of the roof to the reference plane 4 copy the roof paste it in the same place.
Then follow these 2 steps.
9 join roofs add opening to create dormer.
It will place in the new construction phase 5 edit the footprint of the new roof.
When we create the new entrance area roof we will need to join the two roofs together via the join unjoin roof command found in the modify tab geometry panel join unjoin roof command.
Click modify tab geometry panel join unjoin roof.
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This tool is located in the modify tab.