When editing the roof sketch select the edge or edges you would like to slope and select defines slope on the options bar.
How to make a slanted roof in revit.
In the option bar make sure define slope is activated for boundary lines.
Want to create a sloped roof.
By default the whole roof will be sloped.
To create a hip roof 4 side slope define slope for all boundaries.
To specify roof pitch select a slope defining boundary line click the numeric slope definition.
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.
To create a gable roof 2 side slope remove slope for half the boundaries.
The insulation thickness must be at least as thick as the vertical slope else you will receive a warning.
Check variable material in the roof structure to create sloped insulation.
In the drawing area angle icons identify which lines of the sketch define slope.
If slope is activated a triangle symbol will appear next to each boundary.
Want a sloped structure or a sloped insulation in your flat roof.
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.
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.