I believe this tools are not design for this purpose.
Revit how to make top layer of roof longer.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
Probably best to use roof by extrusion in this case.
When there is no variable thickness layer the whole roof or floor slopes and maintains constant thickness between parallel top and bottom faces.
The revit interface is a bit unclear about constructing a flat roof but no roof is truly flat and creating a flat roof in revit allows the designer to annotate the roof without having to deal with the issues associated with the modeled hips and valleys of a low slope roof.
The variable layer thickness parameter of roofs and floors affects the shape editing tools in the following ways.
We give you the tools to master revit in the most natural and straightforward way.
Also has the advantage of using different cuts on the end.
A starter course layer of shingle strips with the exposed tab portion cut off is installed on the eave edges of the roof.
Using shape editing tools.
Use join unjoin roof tool.
But i m not really sure if this is a best practice.
Then follow these 2 steps.
To create a dormer model required walls and additional roof.
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This is the easiest way to do it.
Revit pure is learning made simple.
Use it to extend the dormer roof to the main roof.
The starter course s vertical ad horizontal edges should extend between 1 4 inch to 3 4 inch beyond the edges of the rake and eave.
For more information see modify the shape of a roof or structural floor.
Once you have all your layers you can edit the roof and extend the layers however you want.
Next to the desired layer of the roof or floor in the assembly select the variable check box.
When there is a variable thickness layer the top face of the roof or floor slopes and the bottom stays in a horizontal plane creating.
Click modify element tab shape editing panel modify sub elements and make the desired changes to the roof or floor.
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Click ok until all of the dialogs are closed.
You could also model each roof layer separately.
Make one copy it up change type repeat.
Just enjoy the course and drop me line if you found it useful.