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.
Spray foam r values 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.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
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.
Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used.
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.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
Low density or open cell spray foam.
Closed cell spray foam r values.
Just like for open cell foam r values are additive.
The r value of closed cell foam is r 6 5 7 per inch.
What really matters is the r.
All these have r values ranging from r 3 2 to r 3 8 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.
Not used for interior application.
Medium density or closed cell spray foam.
The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.
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.
Air barrier sealant check.
Closed cell foam r values spray with an r value of 3 5 per inch per inch of thickness.
For 6 inches r 15 or r 19 etc.
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.
Starting at 5 5 per inch.
R value starting at 3 6 per inch.
Starting at 5 7 per inch.
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.
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.
Two inches of closed cell foam will provide r12 r14 of insulation.
Closed cell roofing 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.
They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts.
As a benchmark one inch of solid wood has an r value of 1.
Closed cell spray foams are between 2 and 4 lbs.
