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Re- insulating 2nd floor- good question. Building code requires it because it's a "garage" downstairs; I also have to put up Type-X fire rated sheetrock (the 5/8" stuff that's a PITA to work with) on the garage ceiling. (Probably do OSB for the walls though.) But besides that, I intend to let...

Ah, my bad, I thought you meant 2" of spray foam + insulation... it'd be a lot cheaper; I'll have to ping the inspector and see if he'll allow it.

Hopefully, this is a new spin on the old question. Structure: Garage is 22x26, 2x4 framing, T1-11 siding. Just had the old truss roof ripped off and a 2nd story added on; 2x6 framing, 2x12 rafters. Located in in the Northwest corner of Oregon- commonly in the 30-90 degree range; records are...

Thanks for the feedback, Bill- All the insulation vendors I've talked to agree the most cost effective route is the "winning answer" choice I mentioned. XPS worked out to $750-$1000 more. "Should work" has to be documented to meet code requirements. (I'm not building an ADU... I am building...

In the middle of a build myself, I have to get a 2x12 framed roof to R-49, which has me doing lots of research. Two types of spray foam- open and closed cell. Closed cell doesn't allow air through, so is its own vapor barrier- R-7 per inch, but stupid expensive. The winning answer appears to...