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Revit roof drain slope.
Floors must be flat and on a horizontal plane.
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In addition all flat roofs are not actually flat but also slope towards drains.
Roof floor and paving drainage systems.
Revit will issue a warning when a slope significantly deviates from the expected thickness.
In order to enable shape editing tools the following conditions must be met.
A roof cannot attach to another roof and the roof cannot be a curtain roof.
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.
Your downpipe elbows should automatically generate via the revit autorouting.
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