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Effective Thermal Resistance
The Insulspan SIP System provides wall and roof assemblies with higher effective thermal resistance (R-value) than other construction methods. The R-Value of an assembly is a measure of its ability to resist heat flow through it. The higher the R-Value of your wall assembly, the lower your energy costs for heating and cooling your home.
Wall and roof assembling built with the Insulspan SIP system result in 40-60% reduction in heat loss.
The graph (right) compares effective R-Values for wall and roof assemblies constructed with the Insulspan SIP System versus stick-frame and steel stud construction methods.
Higher effective R-Value translates to reduction in heat loss and lower long-term energy costs.
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Panel
Application |
Panel
Thickness |
Insulation
Thickness |
Joint Type
|
Total Effective Thermal Resistance |
RSI-Value |
R-Value |
Walls
|
4-1/2" |
3-5/8" |
Spline |
2.91 |
16.5 |
Lumber |
2.73 |
15.5 |
6-1/2" |
5-5/8" |
Spline |
4.10 |
23.3 |
Lumber |
3.93 |
22.3 |
8-1/4" |
7-3/8" |
Spline |
5.35 |
30.4 |
Lumber |
4.92 |
28.0 |
Roofs
|
4-1/2" |
3-5/8" |
Spline |
2.87 |
16.3 |
Lumber |
2.76 |
15.7 |
6-1/2"
8-1/4" |
5-5/8"
7-3/8" |
Spline |
4.19 |
23.8 |
Lumber |
4.11 |
23.4 |
Spline |
5.34 |
30.3 |
Lumber |
5.14 |
29.2 |
10-1/4" |
9-3/8" |
Spline |
6.66 |
37.9 |
Lumber |
6.30 |
35.8 |
10-1/2" |
9-5/8" |
Wood I-Joist |
6.37 |
36.2 |
12-1/4" |
11-3/8" |
Spline |
7.99 |
45.4 |
Lumber |
7.19 |
40.8 |
Notes:
The effective thermal resistance values are calculated based upon:
1. Wall or roof assemblies include gypsum board applied on the interior face.
2. Wall assemblies include vinyl siding on the exterior face.
3. Roof assemblies include sheathing paper with asphalt shingles on the exterior face.
4. SIP specifications:
a. Core material: PlastiSpan insulation complying with CAN/ULC-S701, type 1 and ASTM C578, type 1.
b. Skins: 7/16" thick oriented strand board (OSB).
c. Joint assembly: see adjacent figure for typical joint design options.
Installation Images:
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