R value is a measure of insulation s ability to resist heat traveling through it. Ashrae climate zone iecc 2012 r value requirements polyiso thickness to meet iecc old lttr method new lttr method 1 2 3 r 20 2 layers 1 7 2 layers 1 8 4 5 r 25 2 layers 2 1 2 layers 2 2 6 r 30 2 layers 2 5 2 layers 2 6. Please consider this extra thickness requirement when designing blocking heights and specifying fastener lengths.
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