Extruded Polystyrene Insulation R Value Per Inch

Some products have reinforced facing to make them sturdier.

Extruded polystyrene insulation r value per inch.

Lttr per can ulc s770 03. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. Extruded polystyrene insulation product type minimum compressive strength of 15 psi. This product typically has an r value of 3 6 to 4 0 per inch of thickness.

Because of its strength and durability it is ideal for insulating below slab foundations or for below grade foundation walls. Extruded polystyrene xps easily recognized by its blue green or pink color falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. Performance of r 5 per inch. Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s.

R value determined by astm c518. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. It provides r values that range from 3 6 to 4 2 per inch. Extruded polystyrene xps easily recognized by its blue green or pink color xps falls in the middle of the three types of rigid foam insulation in both cost and r value about r 5 per inch.

For a 1 in thick 4 8 panel. Also called styrofoam insulation this is the least expensive material. The r value at 180 day real time age and 75ºf mean temperature is commonly used to compare products and is the value printed on the product. Xps comes unfaced or with a number of different plastic facings.

Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable. 2 vertical compressive strength is measured at 10 percent deformation or at yield whichever occurs first. Choose this option for areas that need a good amount of strength and water resistance. The three studies reported the in service r values per inch of extruded polystyrene xps and expanded polystyrene eps insulation installed under roads and airport runways with the time in service ranging from 1 to 31 years.