I haven't done the soffit yet plan was to vent the entire soffit and put the baffle shoots.
I know blown insulation is possible but batts is easier for me at this time. Just wondering what batts I should use, r-38 faced down.
"At that point, facing on the FG (as long as you have drywall that is air tight and has at least 2 layers of paint) is not required.'----------- regular paint (Class 3)-- (unless it is a special low-perm vapor retarder/barrier paint -Class 2) has no value whatsoever as a vapor retarder per codes- to meet the ventilation rate. As that 4th link stated;
"R601.3.2 Material vapor retarder class. The vapor retarder class shall be based on the manufacturer's certified testing or a tested assembly.
The following shall be deemed to meet the class specified:
Class I: Sheet polyethylene, unperforated aluminum foil.
Class II: Kraft-faced fiberglass batts.
Class III: Latex or enamel paint."
So to meet code; either have vents (high/low)-- and sounds like you have-- per code OR faced batts for the 1/300, otherwise you need 1/150 as WoW figured for you. " As an alternative, the net free cross-ventilation area may be reduced to 1/300 when a Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling."
PS. Just trying to show readers that regular paint won't meet the code requirements, only special low-perm paint.
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