The Insulspan Difference

Overall Thermal Resistance Value (R-Value)

Thermal Performance of the Insulspan SIP System

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 to Panel
Connection Type
Roof Overall
Wall Overall
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.

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