Revit has some great tools for creating and modifying roof overhangs.
Revit roof thickness.
For example a cad line with a 0 30mm thickness will be assigned to line weight 3 which is 0 35mm.
See hd version of video tutorial here.
When revit import such a file it will match the thickness of the cad line to the closest value inside your revit line weight setting.
To create a dormer model required walls and additional roof.
When there is no variable thickness layer the whole roof or floor slopes and maintains constant thickness between parallel top and bottom faces.
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Select the floor or roof.
Use join unjoin roof tool.
Then follow these 2 steps.
9 join roofs add opening to create dormer.
Next to the desired layer of the roof or floor in.
Revit roof tip 9 join roofs add opening to create dormer duration.
This tool is located in the modify tab.
Discover free revit bim objects for roofs.
On the properties palette click edit type.
Roof overhangs behave differently in revit when they are over different thicknesses of walls.
Primary among these tools is the pick walls tool.
Use it to extend the dormer roof to the main roof.
The variable layer thickness parameter of roofs and floors affects the shape editing tools in the following ways.
In the value box of the structure property click edit.
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Download manufacturer approved bim content for roofs.
In the edit assembly dialog specify the material for layers and the thickness of those layers.