Floors must be flat and on a horizontal plane.
Revit roof drain slope.
In order to enable shape editing tools the following conditions must be met.
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A roof cannot attach to another roof and the roof cannot be a curtain roof.
Roof floor and paving drainage systems.
Restrooms labs garages and other rooms often need to have floors that slope towards drains as shown below.
This video shows you how to add a split line and a point to a flat roof so that you can edit the roof to allow for drainage channels gulleys.
Navigate to a suitable elevation view west elevation in the example next go to systems tab pipe draw your desired gutter downpipe run.
Roof floor and paving drainage systems.
In addition all flat roofs are not actually flat but also slope towards drains.