Wall type definition error - drywall on the exterior in Q&A Posted March 17 Plaster, horizontal lath - Yes, house was built in the 30's and originally is plaster and lath. Since one of the most common wall types on the planet are left out of this program and I really could not get a suitable material made for lath, the scratch coat includes the thickness of the lath. There is no brown coat since the scratch is a gypsum/concrete mix with plaster over it. I do not believe the scratch has any lime in it. The thickness of It has had a few renovations where they added drywall over the plaster in several rooms, paneling over plaster and where the plaster and lath were removed and drywall was put back. So each wall type has to be defined several times with the fixed interior/exterior motif in order to get the proper material on the interior of a room. DJP- Automation is the frustrating part of this software. They just seem to leave simple key aspects of control out. I used AutoCAD throughout most of the 90's and you would just define a wall as exterior or interior and then automation would take over or you could override automation. I was wondering if the material definition was causing the issue since CA seems to put a scratch more in exterior finishes associated with stucco. I am dumbfounded that I have to build one of the most common material sequences in housing and that plaster and lath are not just a part of the materials selection of a wall. To be redundant, there are just simple, basic fundamentals that this program lacks and it shouldn't. Here, I built the outside perimeter and started adding interior walls. I did not think you could name a room (ygmn response) until you defined the space either by enclosing walls or using a room divider, which is done here. Back to DJP, I am concerned on what automation is going to do since this is a support wall. Normally, I would not care, except for the way CA aligns the walls. I have a second floor, basement, and crawl space. So it is my understanding that the wall thickness needs to be relatively precise since CA aligns each wall level off of the center of the wall and I have a wide variety of wall thickness that can add up to a couple of inches variance. My house is a 1930's budget, midwestern, gothic farmhouse, originally shaped like a T, with a porch added to the front (now a cross shape). The framing is balloon and this wall stops at the second floor (support 2nd floor) and goes down to the basement foundation. I do not know the impact of CA thinking this is an exterior vs interior wall. I've already had to deal with CA popping an exterior vertical triangle wall segment on top of this wall (turned off roof for this wall). I thought it odd that I can delete the wall segment, use just a default straight interior wall tool and it still calls it an exterior wall. I get handles in the correct location for an independent wall segment. For now, I will just ignore msg.