Polyurethane Foam Insulation 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.

Polyurethane foam insulation r value per inch.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. Some products have reinforced facing to make them sturdier. 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 foam has a higher r value than open cell foam usually about 6 0 per inch.

The r value of. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. 4 8 7 21. A foams r value is its resistance to heat flow or in other words how well they insulate.

For example a wall with 3 fiberglass batting r value of 10 8. 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. 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. 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.

Closed cell spray foam insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Open cell foam insulation values r3 r4. Closed cell spray foam r values.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. R 0 77 30 phenolic foam insulation r values. 8 3 4 4 8 2 20. Corrosion problems when in contact with steel roofing moisture.

It has a glue like consistency adding structural integrity to any wall or ceiling you apply it to. It provides about r 5 per inch. Also called styrofoam insulation this is the least expensive material. But some closed cell foams like tiger foam s e84 closed cell formula have even higher ratings that go up to almost 7 per inch.

Phenolic foam spray 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. Very good air bypass leak sealing properties. This option is pricier than open cell foam but because it provides better r value per inch and also acts as a vapor.

Note from this chart that the ideal r value differs for each part of your home. Closed cell foam offers the best r value per thickness of any insulation at about 6 5 per inch. 4 5 21. Choose this option for areas that need a good amount of strength and water resistance.