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