mk1st, good info. With using advanced framing and 2x6's, does that use 24" on center? My roof is supported by 24" on center 2x4's but the framing is 15". It looks a bit odd in the attic to see the top level knee wall at 15" and 24" back to back. R11 on a knee wall facing the attic seems like almost nothing to me. rest of the attic/ceiling is R25 cellulose for now, it'll need some extra insulation, though of tossing a 23" R19 fiberglass batt on top using that framing but then I'd only have the 2x4's holding it in so I'm not sure I'd get above R11 or not. Seems the framing in my attic to support the roof could have been done more efficiently.
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