Rigid Expanded Polystyrene Insulation Panel For Walls
Some products have reinforced facing to make them sturdier.
Rigid expanded polystyrene insulation panel for walls. Used in roof wall floor below grade structural geofoam applications. It provides r values that range from 3 6 to 4 2 per inch. Thermal performance is rated at r6 6 5 per inch but don t count on that if your winters are cold for the reasons we re about to explain. While all foam insulation products are derived from petroleum some of the key differences include water resistance r value per inch compressive strength facings permeability to water vapor and evidently cost.
Pir polyiso or iso is a thermoset plastic product typically produced as a foam and used as rigid thermal insulation panel most often with aluminum foil facing. Also called styrofoam insulation this is the least expensive material. Expanded polystyrene eps the most versatile of the three rigid insulation options. Highest average r value per dollar about 4 6 r per inch costs the least while meeting or exceeding all required building and energy codes.
Choose this option for areas that need a good amount of strength and water resistance.