Interior walls don't show up in 3D view?

[LizardCobra]

None of my interior walls (drawn using the Create Rooms tool) show up in the 3D view. If I open the window to modify any room, it shows the height as 2 1/2" and the thickness as 3/8". Both of these fields are grayed out, so I am unable to increase the wall height.

[Puybaret]

Rooms are only the surface of a room floor. If you want the walls around the room, you have to draw them too. Read user’s guide for more information.