Spray Foam Insulation R Value Per Inch

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.

Spray foam insulation r value per inch.

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. Products with a higher r value provide greater insulation. 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 foam r values spray with an r value of 3 5 per inch per inch of thickness.

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. 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. Eco spray foam insulation. 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.

Made with plant based products such as soy eco spray foam is more eco friendly. 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. 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. The r value of.

Closed cell spray foam 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. Insulate rim joists and other large areas with this product meant for big jobs. 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.

A typical 2 4 stud filled with open cell spray foam will have an r 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. 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. 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.

Walls below grade and above grade. All these have r values ranging from r 3 2 to r 3 8 per inch. The closed cell spray foam stops air infiltration and provides about an r 5 per inch.