I am trying to build a second floor that is only 48" high at the perimeter of my home. Then a simple 12:12 pitch SIP roof covers the rectangular structure. The SIP design gives me a complete vault. I declared the height of the wall when I built the floor. I am not sure what happened but the outside walls are now taller than even an 8' wall. I am guessing when I used doors, and interior walls, the roof was automatically redrawn to accommodate these standard sizes. I have no idea how to go in and lower everything. I tried lowering objects from a perspective view, but not sure how to lower them all and get the roof to fall. I need to combine a 48" wall with gable to the roof apex on the ends of the building. I stated it was a simple rectangle but is actually two rectangles as the garage has a smaller width.