Finished basement with no foam exterior and interior insulation?
I am planning my basement wall systems for a future home build in Calgary (climate zone 7A), and am trying to determine if I can avoid using foam products (not a fan of environmental impact, or the gasses released in the event of a fie). My current basement wall plan (inside to out) is to use:
5/8″ gypsum drywall
intello plus smart vapour barrier
2×4 wall studs @15″ o/c
R-14 comfortbatt mineral wool between studs
1/2″ air gap between studs/concrete
10″ thick concrete wall
damp proofing/water proofing
3″ thick comfortboard mineral wool panels
Rim joists would be the same, with exterior wool lapping up over bottom foot of wall above.
1. With insulation on interior as well as exterior, do i risk moisture condensing on the inside face of the concrete wall?
2. Is the the intello plus vapour barrier enough protection to handle any of said moisture from Q1?
3. If I went with thicker exterior wool, could I eliminate the interior stud framing, vapour barrier, and insulation all together and just glue gypsum drywall to the inside face of concrete? (and perhaps use half wall with ledge to run electrical though?)
If there are any other suggestions to a better wall assembly, I am open ears. As I said, Ide like to avoid foam, but if its absolutely necessary I suppose I could live with it.
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