Rigid Foam Insulation R Value Per Inch

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Rigid foam insulation r value per inch.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. 4 8 7 21. 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. The time of testing.

So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. It provides r values that range from 3 6 to 4 2 per inch. Also called styrofoam insulation this is the least expensive material. R 0 77 30 phenolic foam insulation r values.

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. Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable. The same insulation will hold more heat the thicker it is installed. 4 5 21.

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 real. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. It provides about r 5 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. 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. For example a wall with 3 fiberglass batting r value of 10 8. 8 3 4 4 8 2 20.

Phenolic foam spray insulation. Rigid insulation is usually made up of fibrous materials or plastic foams. Very good air bypass leak sealing properties. Xps comes unfaced or with a number of different plastic facings.

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. Choose this option for areas that need a good amount of strength and water resistance. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Some products have reinforced facing to make them sturdier.