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R-Values

R-value is defined as a measure of the capacity of a material, such as insulation, to resist heat flow, with increasing values indicating a greater capacity. The higher the R-value of a material, the greater its insulating capacity. Murus SIPs' R-values range from R-16 to R-52, depending upon the type of foam core and its thickness. R-value testing was conducted at a mean temperature of 75 degrees. Unlike fiberglass batt insulation, Murus foam cores do not sag, shift, settle or compress, or otherwise compromise the integrity of the original R-value rating.

R-Values for Murus SIPs

EPS SIPs
Thickness R-value
4-1/2" 15
6-1/2" 23
8-1/4" 29
10-1/4" 37
12-1/4" 45
PUR SIPs
Thickness R-value
4-1/2" 27
5-1/2" 34
6-1/2" 41
GRAPHITE-ENHANCED EPS SIPs
Thickness R-value
4-1/2" 17
6-1/2" 26
8-1/4" 34
10-1/4" 43
12-1/4" 52