Do I need drywall between rafters and T&G wood plank ceiling?
I have read a number of articles about unvented cathedral ceiling design. I’m a diy guy rennovating a 1978 brick ranch in Nashville, TN. Im not sure what climate zone I’m in. By the map, I think I’m in 4, but code requirements seem to be based on 3. I think I’ve read just enough to get unsure of myself. I will hire out all of this work, but I want to make sure the right things are being done to optimize my insulation and not cause more problems. I know there have been several posts on this subject, but I haven’t found anything that is related clear on my exact setup. Thanks for any help anyone can offer.
My existing situation:
Asphalt shingles roof
R11 fiberglass insulation with vent cavity left between sheathing and insulation (no baffles)
Painted Drywall ceiling
Non functioning ridge vent
What I am considering:
Metal standing seam roof
2″ of rigid foam
Existing plywood sheathing
Open cell foam cavity insulation (7″ to 7.5″)
Toungue and groove plank ceiling
Do I need drywall between the t&g planks and the rafters? Is there another alternative? Does everything else look ok?
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