In part 5 of the tutorial, you define roof lines, attach the roof to walls, and modify the roof slope.
This video demonstrates the following:
To create a roof for the project, you first open the roof level by double-clicking it in the Project Browser. Then, on the Architecture tab of the ribbon, click the Roof tool to enter sketch mode. Now you can select a tool from the Draw panel.
In this case, you use the Line tool to draw the edge of the roof along the south wall. Snaps and alignment guides help you draw the line accurately. The triangle shape that displays above the line indicates that this will be a slope-defining edge of the roof.
Next, you will use the Pick Walls tool to draw the remaining 3 roof edges. But before selecting the walls, clear the Defines Slope parameter on the Options Bar, and specify an Overhang value of 3 feet. Now when you select the walls, the corresponding sketch lines for the roof edges will automatically be placed 3 feet away from the walls, and will not display a slope indicator.
Use the Trim command to close the corners of the roof sketch, and then click to finish the sketch. Now the roof is created. In this roof plan view, the cut plane is set too low for the higher portion of the roof to be displayed. From this view, the exterior walls and the interior walls on the second level can be attached to the roof.
Hover the cursor over an exterior wall and then use the Tab key to select the chain of exterior walls. On the contextual tab, click the Attach Top/Base tool and then select the roof for the attachment target. Open a third view to see the resulting roof. Because only one edge was slope-defining, a shed roof was created.
With the roof still selected, use the Properties palette to change the slope value of the roof to 1" over 12". The roof element in the model is adjusted accordingly.