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Unvented roof - maximum R-value the air-permeable insulation can be below the deck?

Ryan Schultz

Ryan Schultz

SAWHORSE
Joined
Apr 2, 2012
Messages
283
Location
Madison, WI
In Zone 6, Per 1203.3.5.1.2, if R-25 rigid (impermeable) insulation is used above the deck per table 1203.3 to control condensation, is there a maximum R-value the air-permeable insulation can be below the deck?
 
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