Drawing and Modifying Roofs by Footprint

How to draw and modify roofs by Footprint.
Command location:
Home tab > Build > Roof dropdown, options: by footprint, by extrusion, by face.

Where:
Must be in a plan view, preferably a Roof plan view that you previously created.

Start command:
Select by footprint, check properties dialog and select correct base level and other options. Look at options bar below Ribbon, change accordingly. Here you will set the desired uniform overhang, leave defines slope selected.

Select Walls:
Hover over a wall and press Tab button until a chain of walls is highlighted, select.

You will still be in the "Create Roof Footprint" command/tab.


Clicking the double arrow icon changes the boundary from inside to outside of wall edges, pick inside for a flat roof with parapet walls or outside for a sloped/hipped roof with eaves.


Define slopes:
A triangular roof slope symbol appears next to each boundary line that is set to define the roof slope. (Example: if all boundary lines define a slope then you will have a hip roof) To change this select one or more boundary lines with the Modify tool, once selected look in the options bar below the ribbon to change this setting. Set the options based on the roof slope and configuration desired.
Create complex slopes: Use the Slope Arrow tool available during the boundary edit command. Any start and stop point on a boundary line. Slope Arrows can be used independently by deselecting "defines slope" option for all boundary lines or in conjunction with some boundaries defining slope. Experimentation is required in order to take full advantage of this command.


Set slopes:
Click each boundary line then corresponding roof slope icon to set the actual roof slopes 1/12, etc.

Finish command:
Click green check mark to finish and accept settings.

Check work:
Go to a 3d view to view the outcome and check your work. Go back and make revisions as required selecting the Roof element and clicking "Edit Footprint".