Zone 7 garage wall insulation
1000sf detached garage
No hvac at present, will be added and run intermittently.
~1/4″ rigid exterior sheeting
Shiplap (possibly salvaged)
2×4 @ 16″
The shiplap has large gaps (up to 1×12 inches). Short of spray foaming/caulking the shiplap prior to putting bat insulation in I do not see any practical way to seal it. Is there any reason not to just go with R-13 batt insulation (faced or unfaced) with a vapor barrier? Interior will be unfinished.
Attic will be sealed and ~R-60 cellulose.