Spray Foam R Value 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.

Spray foam r value per inch.

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. All these have r values ranging from r 3 2 to r 3 8 per inch. 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. 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. For example blown fiberglass typically has an r value of only r 2 to r 3 per inch depending on compression density and moisture. Most spray polyurethane foam is called two component foam. Jun 12 2017 in regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

Spray foam insulation is the new ish kid on the closed cell foam generally provides the most r value per inch of any widely available option making projects like reclaiming an attic into there must be a better way than pricey spray foam insulation to make a home more energy efficient. 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. 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. 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.

Gear obsessed editors choose every product we review. R value is the term given to thermal resistance to heat flow. The higher the r value of an insulation product the more effective the insulation properties. 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.

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. A typical 2 4 stud filled with open cell spray foam will have an r value. If you want to install spray foam in a stud wall and price is no object then it would seem. The r value of closed cell foam is r 6 5 7 per inch.

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. 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. Closed cell insulation products such fiberglass batt insulation standard fiberglass insulation batts or blankets provide an r value of 2 2 to 3 8 per inch of thickness. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.