1 Inch Spray Foam R Value

Varies widely but filling a 2 4 cavity to r 13 with closed cell spray foam costs about 3 50 to 5 25 per sq.

1 inch spray foam r value.

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 insulation. What really matters is the r. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

All these have r values ranging from r 3 2 to r 3 8 per inch. And roofs closed cell spray foams provide a higher r value per inch than less expensive insulation types like fiberglass cellulose or open cell foam. Closed cell spray foam r values. A 3 5 inch deep fiberglass rockwool or recycled denim batt for a typical 2 4 wall may say it provides r 11 or r 13 depending on fiber density.

For 6 inches r 15 or r 19 etc. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. As a benchmark one inch of solid wood has an r value of 1.

I m building at 11 000 feet in colorado. Walls below grade and above grade. Comparing fiberglass to foam fiberglass is the less expensive choice for wall insulation and is the spray foam insulation rental industrial spray foam insulation jun 12 2017 focusing on spray foam insulation materials there is a difference. Closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. 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. As closed spray foam installers say batt is really just a thick furnace filter walls have convection and even if the r values appear the same solid spray foam is warmer in use.

2 6 construction and have the building weather tight but framing exposed inside. 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. 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. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used.

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.