Roof overhangs behave differently in revit when they are over different thicknesses of walls.
Revit roof thickness.
Select the floor or roof.
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.
Revit has some great tools for creating and modifying roof overhangs.
For example a cad line with a 0 30mm thickness will be assigned to line weight 3 which is 0 35mm.
When there is no variable thickness layer the whole roof or floor slopes and maintains constant thickness between parallel top and bottom faces.
Revit roof tip 9 join roofs add opening to create dormer duration.
Next to the desired layer of the roof or floor in.
This tool is located in the modify tab.
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It is always possible to customize the line weight of all imported cad layers.
The variable thickness parameter can be selected to modify the layer thickness of a roof or structural floor.
I then drew a second roof with a 7 1 2 thickness on the inside of the first by using pick walls with extend into wall.
On the properties palette click edit type.
To create a dormer model required walls and additional roof.
See hd version of video tutorial here.
The variable layer thickness parameter of roofs and floors affects the shape editing tools in the following ways.
Discover free revit bim objects for roofs.
Mix play all mix revit pure youtube.
Use join unjoin roof tool.
Use it to extend the dormer roof to the main roof.
Then follow these 2 steps.
Download manufacturer approved bim content for roofs.
In the value box of the structure property click edit.