I’m going to make a short story long…..I am in the process of doing some reno’s in one room upstairs of our house that was built in the 1860’s in Eastern Ontario. It has log walls with the log creating about a 3′ knee wall and then full 3″X5″ rafters about 32″ OC to a 9/12 pitch. Knee walls were strapped with vertical 1X3’s then covered with lath and plaster (no insulation). Rafters appear to have 4/4 boards as the roof decking on the outside and also on the inside of the sloped portions of the room to form the ceiling. The ceiling boards were strapped vertically with lath to create some spacing and then regular lath and plaster was installed (no vapour barrier). Some of the rafter bays have faced batt insulation but it is definitly not a ‘tight’ fit. I have removed all the lath and plaster and will build new regular stud knee walls and use batt insulation. On the sloped portion of the ceiling I may try to pour some loose insulation into the empty areas. I was then considering fastening 1″ foam board insulation to the inside of the ceiling planks (to help insulate and vapour barrier) and then drywalling over that. Finally here is my question….Is there a problem installing drywall over the board insulation and if not, what type of screws should I use as I haven’t seen any ‘drywall’ screws longer than about 1.25″. There is about 6’X 9′ of flat ceiling in the room that I left the lath and plaster on. I was considering also just covering the L&P with foam board and then drywalling that as well. Also, is the foam board sufficient vapour barrier or should I use polyethylene as well??
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