Or is there a way round that.
Revit roof dormer cut.
The dormer cut has been left selected to show the modification.
You need four walls to cut a dormer opening in the main roof and the opening should be fully contained within the dormer roof.
Use the join roof tool to join the dormer roof to the primary roof.
How to model a dormer roof in revit.
In this example side faces of walls and joined faces of the roof were selected.
After adding a dormer cut an opening for it through the roof.
Valid boundaries are highlighted.
Create the walls and roof elements that make up the dormer.
Valid boundaries are a joined roof or its bottom face a side face of a wall a bottom face of a floor an edge of the roof to be cut or a model line on the face of the roof to be cut.
Edit the dormer opening to reflect the roof modification as per figure 9.
To create a dormer roof we first need to start with the smaller roof portion of the dormer.
Select the dormer cut and then select the edit dormer opening from the ribbon as shown in figure 8.
From the home tab select dormer opening.
Say adding a dormer which will involve cutting out a hole in the roof using the dormer tool which leaves a hole in the existing phase view of the roof as well as the new construction view.
Whether you want a double gable roof with 6 pyramid shaped dormers or a simple gambrel roof the basics remain the same.
You can make a roof cut into an existing roof using component model in place.
Change the visual style back to shaded to show the finished item as in.
Welcome to the revit forum.
First a work plane needs to be decided upon.
The next step is to cut a dormer opening in the main roof.