Create the walls and roof elements that make up the dormer.
Revit trim roof.
Cut an opening in a floor roof or ceiling click by face or vertical.
After adding a dormer cut an opening for it through the roof.
Architecture tab opening panel structure tab opening panel use the by face.
Architecture tab opening panel structure tab opening panel if you chose by face select a face in the floor ceiling or roof.
This course covers the topic of adding roofs roof framing and detailing with revit.
From flat roofs to fun free form roofs and everything in between hip gable mansard dutch hip combination and gambrel.
Click modify tab modify panel trim drop down trim extend single element.
Use the join roof tool to join the dormer roof to the primary roof.
Do not use the join geometry roof tool for this task or you may encounter an error when creating the dormer opening.
Ideally in a floor plan view create model lines on the cut edge of the 2 roofs.
Select the reference to use as a boundary.
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In this video i show you how to attach the walls in revit to the roof above them.
Then select the element to trim or extend.