Rigid Foam Insulation R Value Per Inch

This product typically has an r value of 3 6 to 4 0 per inch of thickness.

Rigid foam insulation r value per inch.

Xps comes unfaced or with a number of different plastic facings. Corrosion problems when in contact with steel roofing moisture. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. 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.

4 5 21. 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. 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. Phenolic foam spray insulation.

Also called styrofoam insulation this is the least expensive material. 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. R 0 77 30 phenolic foam insulation r values. The time of testing.

Choose this option for areas that need a good amount of strength and water resistance. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. 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. Very good air bypass leak sealing properties.

It provides r values that range from 3 6 to 4 2 per inch. 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. 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. Some products have reinforced facing to make them sturdier.

The same insulation will hold more heat the thicker it is installed. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. It provides about r 5 per inch. 4 8 7 21.

For example a wall with 3 fiberglass batting r value of 10 8. 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. Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.