Polyurethane Foam R Value Per Inch

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.

Polyurethane foam r value per inch.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. 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. 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. 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.

Closed cell spray foam r values. 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. A typical 2 4 stud filled with open cell spray foam will have an r value. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. All these have r values ranging from r 3 2 to r 3 8 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. Closed cell foam offers the best r value per thickness of any insulation at about 6 5 per inch.

This option is pricier than open cell foam but because it provides better r value per inch and also acts as a vapor. It has a glue like consistency adding structural integrity to any wall or ceiling you apply it to. Note that the material the insulation is made from will change the r value as well. Blown in or loose fill 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. 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. Foam board 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.

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. 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. Insulation blankets batts and rolls spray foam insulation.

For 6 inches r 15 or r 19 etc. The r value of. Radiant barriers and vapor barriers are not rated by.