Click modify tab geometry panel cut drop down cut geometry.
How to cut a hole in roof in revit.
You can use model in place when you want to cut system families like roofs or walls.
Easy step by step tutorial on how to cut a dormer opening into a roof video 2 of 3.
Open the revit family with unattached voids and click create tab properties panel family category and parameters.
Cut an opening in a floor roof or ceiling.
In the family category and parameters dialog select cut with voids when loaded and click ok.
Create an in place family roof at choosing void extrusion.
Ideally in a section view draw the contourline of the void using the pick line option on the base of the inside edge of the roof.
Beginner tutorial how to fit a stair through a floor.
Structure tab opening panel.
If you chose vertical select the entire element.
Click by face or vertical.
Do not use the join geometry roof tool for this task or you may.
Create the walls and roof elements that make up the dormer.
Load the family into the project and place it.
If you chose by face select a face in the floor ceiling or roof.
Create a dormer opening in a roof.
Determine the length of the void ideally in 3d view at wireframe mode extend this in order.
Use the join roof tool to join the dormer roof to the primary roof.