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.
Rigid expanded polystyrene insulation panel for walls.
Used most widely in insulated concrete forms and structural insulated panels.
Some products have reinforced facing to make them sturdier.
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.
Expanded polystyrene eps the most versatile of the three rigid insulation options.
Used in roof wall floor below grade structural geofoam applications.
Choose this option for areas that need a good amount of strength and water resistance.
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.
Rigid foam insulation commonly called styrofoam insulation is made up of expanded polystyrene or eps panels that are secured to basement walls to increase the wall s r value.
It provides r values that range from 3 6 to 4 2 per inch.