Spray Foam Insulation R Value Per Inch Chart

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.

Spray foam insulation r value per inch chart.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. R 0 77 30 phenolic foam insulation r values.

The r value of. Note from this chart that the ideal r value differs for each part of your home. With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. Corrosion problems when in contact with steel roofing moisture.

Closed cell spray foam insulation. Use the following chart to estimate an ideal r value for your insulation project. 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. 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.

A typical 2 4 stud filled with open cell spray foam will have an r value. Most spray polyurethane foam is called two component foam. 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. 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 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. Phenolic foam spray insulation. R values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value. As always should you have any questions or require any assistance in planning your spray foam insulation job please contact us we are always happy to help.

8 3 4 4 8 2 20. 4 5 21. 4 8 7 21. 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.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Very good air bypass leak sealing properties. 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. As a benchmark one inch of solid wood has an r value of 1.