Spray Foam R Values Per Inch

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 r values per inch.

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. What really matters is the r. Not used for interior application. Medium density or closed cell spray foam.

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. 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. R value starting at 3 6 per inch. Starting at 5 5 per inch.

Closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness. Starting at 5 7 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. All these have r values ranging from r 3 2 to r 3 8 per inch.

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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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 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.

Closed cell spray foams are between 2 and 4 lbs. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used. Just like for open cell foam r values are additive. Closed cell spray foam r values.

Closed cell spray foam insulation. 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. The r value of closed cell foam is r 6 5 7 per inch. Two inches of closed cell foam will provide r12 r14 of insulation.

For 6 inches r 15 or r 19 etc. The r value of. Closed cell roofing spray foam. 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.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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. Air barrier sealant check. 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.