Extruded Polystyrene Insulation R Value Per Inch

Extruded polystyrene insulation product type minimum compressive strength of 15 psi.

Extruded polystyrene insulation r value 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. 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. The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day realtime aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03. For a 1 in thick 4 8 panel.

Some products have reinforced facing to make them sturdier. Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable. Because of its strength and durability it is ideal for insulating below slab foundations or for below grade foundation walls. Also called styrofoam insulation this is the least expensive material.

It provides r values that range from 3 6 to 4 2 per inch. Choose this option for areas that need a good amount of strength and water resistance. Extruded polystyrene made from foam that is extruded through a die extruded polystyrene or xps offers impressive compressive strength along with an r value of about 5 0 per inch. R value determined by astm c518.

2 vertical compressive strength is measured at 10 percent deformation or at yield whichever occurs first. Performance of r 5 per inch. Xps comes unfaced or with a number of different plastic facings. Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate design safety factors should be used to prevent long term creep and fatigue deformation.

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. 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. 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.