The high quality Expanded Polystyrene (EPS) insulation panels are perfect for creating an all foam insulation system. Use these panels in conjunction with expanding spray foam to achieve a high R-Value at a lower cost than spray foam alone. The panels in this kit are 13.25" wide x 48" tall x 2.25" thick to fit in standard wall cavities. Panels are easily cut or combined to fill the bulk of your cavity. Foam Insulation Panels do not support bacterial or fungus growth and contain no fiberglass irritants.