Spray Foam R Value Chart

A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14.

Spray foam r value chart.

The r value of fiberglass insulation is approximately 2 2 per inch so much thicker fiberglass insulation is required to achieve the same r value of 38. Closed cell spray foam insulation is vapor and air impermeable and is applied with a minimum of 2 on average with use on on interior and exterior building applications. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Use the following chart to estimate an ideal r value for your insulation project.

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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. It has a lower r value per inch than closed cell foam and is vapor permeable. As a benchmark one inch of solid wood has an r value of 1.

Closed cell spray foam insulation. The r value for open cell is typically around 3 7 at 1 thick and varies by manufacture. The r value of spray foam insulation is approximately 6 per inch so those using spray foam as their insulator will need about 6 3 inches of thickness to reach r 38. 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.

All these have r values ranging from r 3 2 to r 3 8 per inch. 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. Installing more insulation in your home increases the r value and the resistance to heat flow. Closed cell spray foam r values.

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. 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. 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 6 inches r 15 or r 19 etc.

Closed cell spray foam insulation. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. The r value of some insulations also depends on temperature aging and moisture accumulation. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

When calculating the r value of a multilayered installation add the r values of the individual layers.