Our home is 2x4 construction one story 6/12 pitch. The plan is to add a 12x28 room in the attic which is above three BRs, hallway, and 2 baths. A 12 x 28 br and closet, 12x28 hallway bath and br, and a 16x28 mr br bath & closet. This part of the house is 28 X 40 above a crawl space. The other...