This is the easiest way to do it.
Revit how to make top layer of roof longer.
Using shape editing tools.
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.
For more information see modify the shape of a roof or structural floor.
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Probably best to use roof by extrusion in this case.
You could also model each roof layer separately.
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This tool is located in the modify tab.
The variable layer thickness parameter of roofs and floors affects the shape editing tools in the following ways.
A starter course layer of shingle strips with the exposed tab portion cut off is installed on the eave edges of the roof.
Also has the advantage of using different cuts on the end.
You don t even need to sign up.
For creating complex roof it might be easier if you create separate roof then use join roof tool to join them later.
To create a dormer model required walls and additional roof.
Use it to extend the dormer roof to the main roof.
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Use join unjoin roof tool.
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.
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Click modify element tab shape editing panel modify sub elements and make the desired changes to the roof or floor.
Then follow these 2 steps.
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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But i m not really sure if this is a best practice.
Make one copy it up change type repeat.
I believe this tools are not design for this purpose.
Click ok until all of the dialogs are closed.
You need to create the bay window roof separately.