InsulFoam InsulLamTM

InsulFoam InsulLamTM

Composite EPS Insulation Nailbase for Roofs

InsulLam is an engineered insulation consisting of a closed-cell, lightweight and resilient expanded polystyrene (EPS) bonded to an APA/TECO-rated oriented strand board (OSB) or plywood. The InsulLam foam core is cut from the same high-quality EPS as our InsulRoof roof insulations and, upon request, will meet or exceed the requirements of ASTM C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation.

The OSB is available in nominal thicknesses of 7/16” and 5/8”. The plywood is available in a nominal thickness of 5/8”. InsulLam has excellent dimensional stability, compressive strength and water resistance properties. InsulLam can also be manufactured with an assortment of other cover boards.


InsulLam is a high-performance nailbase insulation, and is an excellent substrate for a variety of steep-and-low slope roof systems. InsulLam is acceptable for single-ply roof applications that employ mechanically fastened, ballasted or adhered EPDM, TPO or PVC, as well as low-sloped built-up and modified bitumen membrane systems. InsulLam is also well-suited for vaulted and cathedral ceilings. InsulLam can also be used as an underlayment for shingle, tile, slate and metal roofing systems. InsulLam is not a structural panel, and is suitable only for installation over fully supported structural decks. Consult the roof manufacturer for additional guidelines.