You can change a roof’s shape, slope, overhang distance, fascia distance, etc. You can specify different settings for different segments if you want.
To edit a roof’s shape or size:
Click on the roof edge whose properties you want to edit. You can select additional segments using Shift+click.
Right-click and select Properties, or select Edit > Modify Elements > Properties.
To convert the currently selected segments to a different roof type, click the graphical button in the Roof Shape area, then select a roof type in the Roof Shape dialog.
To edit the general dimensions and geometry of the roof, edit the values on the Basic page. Note that a gable roof will have fewer properties.
Click OK.