Most spray polyurethane foam is called two component foam.
Spray foam insulation r value per inch chart.
The r value of.
As a benchmark one inch of solid wood has an r value of 1.
For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.
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.
The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.
Corrosion problems when in contact with steel roofing moisture.
A typical 2 4 stud filled with open cell spray foam will have an r value.
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.
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.
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.
4 8 7 21.
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 0 77 30 phenolic foam insulation r values.
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.
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 insulation.
Use the following chart to estimate an ideal r value for your insulation project.
8 3 4 4 8 2 20.
4 5 21.
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.
Phenolic foam spray insulation.
With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely.
All these have r values ranging from r 3 2 to r 3 8 per inch.
Note from this chart that the ideal r value differs for each part of your home.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
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 provides a higher r value per inch 6 5 than less expensive insulation types like cellulose and fiberglass 3 5 to 3 7.
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.
