I would like to change the height of one of the roof planes in my model. How do I accomplish this?
Roof planes generate on the wall top plates, which are governed by the ceiling height specified in a given room or floor. There are several ways to change the height of a roof plane. You can, for example, specify a new baseline height in the roof plane's specification dialog or select and move the baseline in a 3D view. However, the easiest way to change a roof plane's height, while easily maintaining its pitch, is by raising or lowering it a specific amount using the Transform/Replicate Object edit tool.
To raise or lower a roof plane
Click the Select Objects tool, then click once on a roof plane near one of its edges to select it.
Click the Transform/Replicate Object edit button.
In the Transform/Replicate Object dialog:
Check the box beside Move, which will enable the selections directly beneath it.
To the right, select the Relative To Itself radio button so that the roof plane moves relative to its current location.
Specify how high you want to raise the roof plane, or how low you want to lower it, in inches or millimeters.To move the roof plane up, enter a positive number in the Z Delta field. To move the roof plane down, enter a negative number in the Z Delta field.
In this example, we are raising the roof plane by 12".
Click the OK button to close the dialog and confirm the changes.
Create a Camera view to confirm that the roof plane is in the desired location.