Rigid Foam Insulation R Value Per Inch

Xps comes unfaced or with a number of different plastic facings.

Rigid foam insulation r value per inch.

Very good air bypass leak sealing properties. 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. R 0 77 30 phenolic foam insulation r values. 4 8 7 21.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material. Corrosion problems when in contact with steel roofing moisture. The same insulation will hold more heat the thicker it is installed.

8 3 4 4 8 2 20. Some products have reinforced facing to make them sturdier. 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 real. Choose this option for areas that need a good amount of strength and water resistance.

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 time of testing. Rigid insulation is usually made up of fibrous materials or plastic foams. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.

Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. It provides r values that range from 3 6 to 4 2 per inch. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. For example a wall with 3 fiberglass batting r value of 10 8. Also called styrofoam insulation this is the least expensive material.

It provides about r 5 per inch. 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. 4 5 21. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data.