I ve recently bumped up against this problem and my solution for a flat curb was to use a bit of roof sketched to the required size raised 6 minimum above the main minimally slope.
Roof is flat revit.
Get this revit file here.
Want to create a flat roof.
We cover creating the flat roof adding slopes to roof by using.
On the options bar set overhang to 0 and clear defines slope.
On the mode panel click finish to place the roof.
To turn a sloped roof into a flat roof select all roof boundaries purple lines and uncheck defines slope in the option bar.
Roof by footprint can be used for both flat and sloped pitched roofs.
Then choose attach top base 2 and finally select the roof 3.
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.
Click architecture tab roof drop down roof by footprint.
Revit then makes the wall meet the underside of the roof correctly.
On the properties palette set the underlay value to 01 store floor.
This video covers how to create a flat roof in revit that contains slopes for roof drainage.
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2 activate slope to create a sloped roof.
We can use the same attach top base tool to tidy up this junction.
If you choose not to move the roof to a different level revit notifies you later if the roof is too low.
In the option bar make sure defines slope is deactivated before drawing the boundary.
If you try to add a roof on the lowest level a dialog prompts you to move it to a higher level.
On the draw panel click pick walls.
Draw a flat roof.
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 modelled hips and valleys of a low slope roof.