Energy Efficiency of SIPs
R-Control SIP Panel R-values
| Panel Thickness |
R-value at 75o |
R-value 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.