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Energy Efficiency of SIPs

R-Control SIP R-Values

at 75o
at 40o
4-1/2" 14.9 16.0
6-1/2" 22.6 24.3
8-1/4" 29.3 31.6
10-1/4" 37.0 39.9
12-1/4" 44.7 48.3

Whole Wall R-Value

There’s more to most walls than meets the eye, and the R-value of a whole wall can be considerably lower than the R-value of the insulation. Whole wall R-value calculation procedures factor in all of the effects of additional structural members at windows, doors, and exterior wall corners.