The Insulspan® SIP System provides wall and roof assemblies with higher overall (effective) thermal resistance (R-value)
than other construction methods. The overall R-value of a building assembly includes the effect of thermal bridges as a
result of framing members and is a measure of its ability to resist heat flow through it. The higher the overall R-value
of a building assembly, the lower the long-term energy costs will be for heating and cooling.
The table below provides typical overall R-Values calculated for wall and roof assemblies built with the Insulspan SIP
System based upon:
| Panel Thickness |
Insulation Thickness |
Panel to Panel Connection Type |
Roof Overall R-Value |
Wall Overall R-Value |
| 4-1/2" | 3-5/8" | OSB Spline | 16.3 | 16.5 |
| Single 2x Lumber | 15.7 | 15.5 | ||
| 6-1/2" | 5-5/8" | OSB Spline | 23.8 | 23.3 |
| Single 2x Lumber | 23.4 | 22.3 | ||
| 8-1/4" | 7-3/8" | OSB Spline | 30.3 | 29.2 |
| Single 2x Lumber | 29.2 | 28.0 | ||
| 10-1/4" | 9-3/8" | OSB Spline | 37.9 | |
| Single 2x Lumber | 35.8 | |||
| 12-1/4" | 11-3/8" | OSB Spline | 45.4 | |
| Single 2x Lumber | 40.8 |
Air leakage is one of the biggest sources of energy loss in most buildings. The air leakage rate for a building
(quantified in terms of air changes per hour) is often used to determine the energy efficiency of building construction.
Air leakage rates vary widely for different types of house construction with values of 0.2 acph or lower achievable for
energy efficient house construction using the Insulspan SIP System.
The combined high overall R-Value and low air leakage characteristic of buildings built with the Insulspan SIP
System results in significantly lower energy costs versus other construction methods such as wood frame construction.
