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-57, depending upon the type of foam core and its thickness. R-value testing was conducted at a mean temperature of 75 degrees Fahrenheit. 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
(Expanded Polystyrene)
Thickness
R-value
4-1/2"
16
6-1/2"
23
8-1/4"
30
10-1/4"
38
12-1/4"
45
PUR SIPs (Polyurethane)
Thickness
R-value
4-1/2"
26
5-1/2"
33
6-1/2"
40
XPS SIPs
(Extruded Polystyrene)
Thickness
R-value
4-1/2"
19
6-1/2"
29
8-1/4"
37
10-1/4"
47
12-1/4"
57
The Murus Company, Inc.
PO Box 220 . 3234 Route 549 . Mansfield, PA . 16933
Toll Free: 800-626-8787 Local: 570-549-2100 Fax: 570-549-2101
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