Spray Foam Insulation R Value Per Inch Chart

Use the following chart to estimate an ideal r value for your insulation project.

Spray foam insulation r value per inch chart.

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. R 0 77 30 phenolic foam insulation r values. 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. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. 4 8 7 21. A typical 2 4 stud filled with open cell spray foam will have an r value. 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.

Closed cell spray foam insulation. All these have r values ranging from r 3 2 to r 3 8 per inch. 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.

Corrosion problems when in contact with steel roofing moisture. 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. 8 3 4 4 8 2 20.

The r value of. 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. Note from this chart that the ideal r value differs for each part of your home. Phenolic foam spray insulation.

Most spray polyurethane foam is called two component foam. Very good air bypass leak sealing properties. 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. As a benchmark one inch of solid wood has an r value of 1.

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. 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. 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. 4 5 21.