Spray Foam Insulation R Value Per Inch Chart

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Spray foam insulation r value per inch chart.

Note from this chart that the ideal r value differs for each part of your home. 4 8 7 21. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Phenolic foam spray insulation.

All these have r values ranging from r 3 2 to r 3 8 per inch. A typical 2 4 stud filled with open cell spray foam will have an r value. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch.

If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right. Open cell spray foams are between 5 and 1 lbs per cubic foot and have an r value of 3 0 4 0 per inch of insulation. Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch. 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.

Closed cell spray foam provides a higher r value per inch 6 5 than less expensive insulation types like cellulose and fiberglass 3 5 to 3 7. Corrosion problems when in contact with steel roofing moisture. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Very good air bypass leak sealing properties.

The r value of. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Use the following chart to estimate an ideal r value for your insulation project.

Most spray polyurethane foam is called two component foam. 8 3 4 4 8 2 20. If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

R 0 77 30 phenolic foam insulation r values. 4 5 21. Closed cell spray foam insulation. That means if you used foam it green closed cell which is r 7 per inch it s r value for a 3 5 deep wall.