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Rigid foam insulation r value per inch. 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. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.
This product typically has an r value of 3 6 to 4 0 per inch of thickness. 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. 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. 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.
Corrosion problems when in contact with steel roofing moisture. 4 5 21. Rigid insulation is usually made up of fibrous materials or plastic foams. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.
Xps comes unfaced or with a number of different plastic facings. 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. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. For example a wall with 3 fiberglass batting r value of 10 8.
Very good air bypass leak sealing properties. 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 time of testing. The same insulation will hold more heat the thicker it is installed.
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. 8 3 4 4 8 2 20. R 0 77 30 phenolic foam insulation r values. It provides r values that range from 3 6 to 4 2 per inch.
4 8 7 21. It provides about r 5 per inch. Choose this option for areas that need a good amount of strength and water resistance. Unfaced 1 in thick xps has a perm rating of around 1 making it semipermeable.
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