When I use the create roof command, the roof in 3D appears well above the top of the walls. For example, if in Model Setup, I create a one story building without a basement, select "Use zero for the ground floor", select Default wall height as "Floor to floor", Mod-Floor 0 Elevation shows as 0", set Mod-Floor 0 Ceiling height at 8'-0", and Mod-Roof Elevation at 8"0", then when viewed in 3D the roof is floating about 8'-0" above the top of the wall. If I go back to Model Setup and set the Mod-Roof Elevation at 0", then the 3D view shows the roof floating about 8'-0" above a wall that has no height. Help. Thanks.