Insulfoam Unfaced Foam is an engineered insulation consisting of a superior closed-cell, lightweight and resilient expanded polystyrene (EPS). Insulfoam Unfaced Foam is available in 4′ x 4′ and 4′ x 8′ standard sizes with thicknesses from ¼” to 40″, and is readily available in custom lengths, widths and densities with little to no impact on lead time. It is also available in tapered panels.