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.
Revit how to make top layer of roof longer.
Once you have all your layers you can edit the roof and extend the layers however you want.
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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To create a dormer model required walls and additional roof.
Click modify element tab shape editing panel modify sub elements and make the desired changes to the roof or floor.
Next to the desired layer of the roof or floor in the assembly select the variable check box.
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.
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But i m not really sure if this is a best practice.
You need to create the bay window roof separately.
You could also model each roof layer separately.
Using shape editing tools.
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.
Probably best to use roof by extrusion in this case.
A starter course layer of shingle strips with the exposed tab portion cut off is installed on the eave edges of the roof.
This is the easiest way to do it.
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Use join unjoin roof tool.
Click ok until all of the dialogs are closed.
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Make one copy it up change type repeat.
I believe this tools are not design for this purpose.
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.
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Then follow these 2 steps.
For more information see modify the shape of a roof or structural floor.