To create a dormer model required walls and additional roof.
Revit joining exting and new roof.
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.
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Select an edge of the roof that you want to join and then select the wall or roof to which you want to join the roof.
9 join roofs add opening to create dormer.
Align one edge of the roof to the reference plane 4 copy the roof paste it in the same place.
Click modify tab geometry panel join unjoin 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.
Use it to extend the dormer roof to the main roof.