I believe this tools are not design for this purpose.
Revit roof secrets.
2 activate slope to create a sloped roof want to create a sloped roof.
This is the easiest way to do it.
Download manufacturer approved bim content for roofs.
We can use the same attach top base tool to tidy up this junction.
Once again select the wall first 1.
Revit then makes the wall meet the underside of the roof correctly.
Roof by footprint can be used for both flat and sloped pitched roofs.
In the option bar make sure defines slope is activated for boundary lines.
To turn a sloped roof into a flat roof select all roof boundaries purple lines and uncheck defines slope in the option bar.
Please like this video.
Then choose attach top base 2 and finally select the roof 3.
Using shape editing tools.
But i m not really sure if this is a best practice.
Discover free revit bim objects for roofs.