In order to enable shape editing tools the following conditions must be met.
Revit roof shape editing.
An alternative way to apply slope to a roof or floor is the shape editing tools.
Revit will issue a warning when a slope significantly deviates from the expected thickness.
First select the roof.
Use pick supports to split the roof element at the supporting beams.
Floors must be flat and on a horizontal plane.
On this flat slab you add one or more points and then adjust the z height of those points.
Floors and roofs that have been shape edited will not report a true thickness.
Use shape editing to add internal drains to the roof built using sloped insulation.
First activate add split line and draw the lines like below.
A roof cannot attach to another roof and the roof cannot be a curtain roof.
In the example below we add a bunch of points and change their relative height with modify sub elements tool.
The shape editing tools were designed to allow for moderate slopes and in such cases variances in true thickness are trivial.
This shape editing tools will not appear if you define the roof slope.
These are available on flat slabs only.
Modify the height of points to create the desired slope.
Shape editing tools are used to create flat roof slope.
Revit structure you can use shape editing tools to manipulate the surface of a flat non sloped floor or roof by defining high and low points for drainage.
Add points manually or create them automatically with split lines.
You will see shape editing tools from in your ribbon contextual tab.
The shape editing tools display on the contextual tab.
However more significant slopes will increase this variance.
By specifying the elevation of these points you split the surface into sub regions that can slope independently.
After you finish creating the roof select it.