Blue Dow Corning Foam 1-1/2" x 4' x 8' Styrofoam – R-7.5

The Blue Dow Corning 1-1/2" Styrofoam Insulation Board provides high-performance thermal protection with an impressive R-value of 7.5. Sized at 1-1/2 inches thick by 4 feet by 8 feet, this extruded polystyrene (XPS) board is engineered for energy-efficient construction and renovation projects.

Its closed-cell structure resists water absorption, mold, and mildew, making it ideal for use in below-grade foundations, exterior sheathing, basements, and under concrete slabs. The rigid design maintains strength and insulation value over time, even in challenging environments.

Easy to handle and install, this board helps create a tighter building envelope that reduces energy costs and enhances comfort year-round.