I think I may have messed up on the OLD home I'm turning into my office and craft room. If so, tell me now because I haven't put the interior treatment on. The 'attic space' is an unfinished area that is tall enough for my studio. The single peak roof was redone with asphalt shingles and a ridge vent. The area is 30 feet front to back, which is the length of the house, and not quite 20 on the width. There is no 'wall', just the interior of the roof slope on each side of the rectangular space. As someone mentioned in a post on the other insulating a roof thread, I put insulating bats directly against the roof decking between the rafters. There isn't any moisture barrier on this insulation. It is held in place by chicken wire. I was going to apply the room's 'wall' treatment directly against that. Help! If this is going to cause a moisture problem, now is the time to rip it out and do something different.