Add vertical or by face opening this is part of the revit pure basics package.
How to cut a roof in revit.
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Open the revit family with unattached voids and click create tab properties panel family category and parameters.
Create the walls and roof elements that make up the dormer.
In the family category and parameters dialog select cut with voids when loaded and click ok.
Load the family into the project and place it.
After adding a dormer cut an opening for it through the roof.
After creating a roof change the style of the eaves by specifying the rafter cut.
The roof rafters provide integral structural support to the roof.
On the properties palette for rafter cut select plumb cut two cut plumb or two cut square.
If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.
Visit revit products forum.
An option would be to cut hole in the roof is to use roof voids the following way.
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 determine the length of the void ideally in 3d view at wireframe mode extend this in order to intersect the.
For two cut plumb and two cut square specify a value for fascia depth between zero and the thickness of the roof.
In the drawing area select the roof.
Select the object to be cut.
You can cut openings in the faces of these elements or you can select the entire element to make a vertical cut.
Click modify tab geometry panel cut drop down cut geometry.
Use one of the opening tools to cut a vertical or perpendicular opening in a roof floor or ceiling for example to accommodate a chimney.
Architecture tabopening panel structure tabopening panel use the by face option when you want the.
Click by face or vertical.