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The standard recommendation for attic spaces is R-50. More is usually better but personally I wouldn't layer it more than two or three layers because it's a fairly good idea to inspect it every now and then for water leeks and "critters" and too much would finding a wet spot difficult, not to mention being able to safely walk the rafters when you need too.
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"Without deviation from the norm, progress is not possible"---F. Zappa
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