The high quality Expanded Polystyrene (EPS) insulation panels are perfect for creating an all foam insulation system. Use these foam board wall panels in conjunction with expanding spray foam to achieve a high R-Value at a lower cost than spray foam alone. The foam panels in this kit are 13.25" wide x 48" tall x 2.25" thick to fit in standard wall cavities. Foam insulation sheets 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.