Spray Foam Insulation R Value Per Inch Chart

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Spray foam insulation r value per inch chart. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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. 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.

Phenolic foam spray insulation. 4 5 21. 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.

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. 4 8 7 21. Use the following chart to estimate an ideal r value for your insulation project. 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.

The r value of. 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. With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. R 0 77 30 phenolic foam insulation r values.

As a benchmark one inch of solid wood has an r value of 1. 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. Corrosion problems when in contact with steel roofing moisture.

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. 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. Note from this chart that the ideal r value differs for each part of your home. All these have r values ranging from r 3 2 to r 3 8 per inch.

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. 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. Most spray polyurethane foam is called two component foam. 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.