Closed cell spray foam r values.
Polyurethane foam r value per inch.
Foam board insulation.
Aerogel has the next highest r value about r 10 to r 30 per inch followed by polyurethane pur and phenolic foam insulations with r 7 per inch.
It has a glue like consistency adding structural integrity to any wall or ceiling you apply it to.
Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used.
Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.
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.
A typical 2 4 stud filled with open cell spray foam will have an r value.
Radiant barriers and vapor barriers are not rated by.
Insulation blankets batts and rolls spray foam insulation.
Open cell foam cells are not as dense and are filled with air which gives the insulation a spongy texture and a lower r value.
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.
Blown in or loose fill 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.
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.
The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.
Here are the installation methods from lowest to highest average r value per inch.
Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s.
All these have r values ranging from r 3 2 to r 3 8 per inch.
Closed cell foam offers the best r value per thickness of any insulation at about 6 5 per inch.
For 6 inches r 15 or r 19 etc.
This product typically has an r value of 3 6 to 4 0 per inch of thickness.
Like polyiso foam the r value of closed cell polyurethane insulation can drop over time as some of the low conductivity gas escapes and air replaces it in a phenomenon known as thermal drift or ageing.
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.
Note that the material the insulation is made from will change the r value as well.
Vacuum insulated panels have the highest r value approximately r 45 in u s.
Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior.
This option is pricier than open cell foam but because it provides better r value per inch and also acts as a vapor.
