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Posted by Mongo on January 29th, 2003 11:52 PM
In reply to Cathedral ceiling insulation by Ben Carlino on January 29th, 2003 01:08 PM [Go to top of thread]

R30 is 9 1/2" thick. R30C is 8 1/4" thick.

You'll have to compress the R30 to maintain a vented space between the FG and the sheathing. Compressing the FG batt will reduce its effective R value below 30.

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