SIPs are a simple laminated structure, made of two sheets of OSB glued to a Foam-Control® 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.
FoamControl 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.