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.
Mixed flat and sloped roof revit.
Then choose attach top base 2 and finally select the roof 3.
Roof by footprint can be used for both flat and sloped pitched roofs.
In the drawing area angle icons identify which lines of the sketch define slope.
To create a sloped roof in revit modify the footprint sketch of the roof by selecting and specifying the slope defining edges of the roof.
When editing the roof sketch select the edge or edges you would like to slope and select defines slope on the options bar.
1 check define slope to create a sloped roof.
Revit then makes the wall meet the underside of the roof correctly.
Create a sloped roof in revit step 1 draw your roof step 2 define the slope.
Once again select the wall first 1.
Create a roof slope using the defines slope property by applying the defines slope property to lines of a roof boundary you can create different roof types including flat roofs gable roofs and hip roofs.
Revit roof slope can seem complicated at first glance but by learning a few critical features you can create any roof shape you desire.