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In OC, it really don't matter if its R30 or 38. I like 38, overkill, but not necessary. We do not have extreme cold or heat around here, I would have them drag in fiberglass batts and install it up there and be done with it. How old is the house? you build a tight attic, but the rest of the house leaks so you win some and lose some. Not a big deal IMO.
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