Interior walls, made with 2x4 studs, are 3.5" thick, but after the 1/2" sheetrock is applied, the wall is now 4.5" thick. If I want the interior room to be 12' x 15', does the SW automatically add the inch to the 3.5" wall thickness, or do I need to make the room interior dimension 12'-1" x 15'-1"?
An architect who drew my last house plan, used AutoCad and the interior wall thickness he used was 4.5" to allow for the sheetrock. What does SoftPlan recommend, since 4.5" is not one of the selections?