SIPs are a simple laminated structure, made of two sheets of OSB glued to an R-Shield® expanded polystyrene (EPS) core.
The entire face of the core is coated with a structural grade adhesive meeting ICC ES AC05 before it is married to the OSB. Following lamination, the panel is pressed while the adhesive crosslinks and cures.
R-Shield EPS cores are UL-certified, and comply with U.S. product standard ASTM C578 Type 1, with a minimum density of 0.95 pounds per cubic foot and minimum compressive strength of 10 psi. They also meet the acceptance criteria standards of ICC-ES AC12. Panel thickness ranges from 4-1/2 to 12-1/4 inches.
We exclusively use OSB that complies with the APA's voluntary product standard PS2-92, and all our OSB has the APA or TECO performance mark. Thicknesses of 7/16, 5/8 or 3/4-inch may be used, depending on the application.