I need to insulate overhead in a 720sf unfinished living space addition. It must be done from the inside, as it is already roofed. It has a flat roof, with 1/2" roof sheathing nailed directly on top of the 2 x 10 ceiling joists. The spaces are 9" deep on 16" centers. It is divided into a bedroom, a living room, a kitchen and two 3/4 bathrooms. The insulation was already purchased some time ago and cannot be returned or exchanged. It is in bundles of individual unfaced fiberglass bats, about 6 feet long. There is no drywall up, all bare framing. I was planning on stapling 4-6 mil plastic sheeting on the living space side of the ceiling joists as a vapor barrier, once I figured out how to keep the bats in place while I did so. Any suggestions on the best way to do this and get the best results?
Also, there are 2 x 10 cross-braces about 1/2 way down the run of the ceiling joists, with vent three 2-1/2" holes drilled through each of them. There are also three 2-1/2" vent holes drilled in the overhang freeze blocks to the outside and the freeze blocks at the house. Should these be left open, or closed off? Thanks.
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