Do minimum thickness of foam rules still apply for the partition wall between an insulated attached garage and the house?
Climate zone 6 location near Green Bay, wi. Partition wall is advanced frame 2×6 wall construction with planned 2 lb density blown fiberglass. I would like to use 1″ foil faced polyiso on the cold side of the wall to limit thermal bridging and also tape the panels for a primary air barrier.
The “cold” part of the garage is insulated 2×8 framing with 2×4 mooney wall strapping for a center cavity depth of 8.75″ of 2 lb density blown fiberglass. Exterior sheathing is zip taped cdx. The foundation walls are r-10 continuous foam, and the garage floor is also r-10 foam. I doubt the interior of the garage will ever drop below freezing, so I was hoping I could cheat a little bit on the foam thickness for the partition wall.
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