Dupont Rigid Foam Insulation replaces non-insulating above-grade sheathing products like plywood, fiberboard and OSB, and eliminates the need for additional air barriers such as housewrap. It has clear film facings on both sides for added durability.

Styrofoam Boards are also designed for insulating interior basement walls, crawl spaces, and ceilings in both renovation and retrofit situations with precut insulation sheets and slotted edges that accommodate wood nailing strips that serve as a nailing base for drywall.

Dupont Styrofoam Brand Foundation Insulation products are installed against the exterior side of the foundation wall, suitable for use in pervious, semi-pervious & practically impervious soils and for sealing sill plates around door and window framing to reduce air infiltration.