STYROFOAM SIS™ (U.S. Residential Only)
STYROFOAM SIS™ Brand Structural Insulated Sheathing combines structural lateral bracing and transverse load, insulation and water-resistive barrier properties. It is designed for use as braced wall panels attached next to other rigid insulated sheathing. It can also serve as continuous structural insulated sheathing over the entire structural insulated wall line.
STYROFOAM SIS™ Brand Structural Insulated Sheathing is the first structural insulated sheathing to achieve significant R-values (R-3.0 at 0.5"; R-5.5 at 1") and eliminates the need for wood structural panels and housewrap, wood let-in bracing or metal T-bracing. In addition, this sheathing helps lower the installed cost because it allows the builder to install structural support, insulation and a water-resistive barrier (sheathing joints taped with 2-7/8" WEATHERMATE™ Construction Tape (required to qualify) with less trips around the house.
Building Code Compliance
Foam complies with ASTM C1289-07. Meets IBC/IRC requirements for foam plastic insulation. See ICC-ES AC269.
STYROFOAM SIS™ Brand Structural Insulated Sheathing combines structural lateral bracing, insulation and water-resistive barrier properties in one solution.
| Nominal Board Thickness(1), in | R-Value(2) | Board Size, ft | Edge Treatment | Min Compressive Strength(3), psi |
| 0.5 | 3.0 | 4 x 8 / 4 x 9 / 4 x 10 | Square Edge | 20 |
| 1.0 | 5.5 | 4 x 8 / 4 x 9 / 4 x 10 | Square Edge | 20 |
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(1) Not all product sizes are available in all regions. (2) R means resistance to heat flow. The higher the R-value, the greater the insulating power. R-values are expressed in ft2• h•°F/Btu. R-value determined by ASTM C518. (3) Vertical compressive strength is measured at 10% deformation or at yield, whichever occurs first. |
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