Spray Foam Insulation R Value Per Inch

The closed cell spray foam stops air infiltration and provides about an r 5 per inch.

Spray foam insulation r value per inch.

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. 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. Insulate rim joists and other large areas with this product meant for big jobs. Made with plant based products such as soy eco spray foam is more eco friendly.

Note from this chart that the ideal r value differs for each part of your home. 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. Closed cell spray foam 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.

Products with a higher r value provide greater 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. 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. A typical 2 4 stud filled with open cell spray foam will have an r value.

All these have r values ranging from r 3 2 to r 3 8 per inch. Walls below grade and above grade. Eco spray foam insulation. 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.

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 fiberglass insulation is approximately 2 2 per inch so much thicker fiberglass insulation is required to achieve the same r value of 38. The r value of. 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.

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. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.