Polyurethane Foam Insulation R Value Per Inch

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

Polyurethane foam insulation r value 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. Very good air bypass leak sealing properties. 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. Some products have reinforced facing to make them sturdier.

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. Closed cell foam offers the best r value per thickness of any insulation at about 6 5 per inch. Note from this chart that the ideal r value differs for each part of your home. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

It provides about r 5 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. Closed cell spray foam r values. Choose this option for areas that need a good amount of strength and water resistance.

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. It provides r values that range from 3 6 to 4 2 per inch. For example a wall with 3 fiberglass batting r value of 10 8. 4 8 7 21.

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. Also called styrofoam insulation this is the least expensive material. A foams r value is its resistance to heat flow or in other words how well they insulate.

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. All these have r values ranging from r 3 2 to r 3 8 per inch. It has a glue like consistency adding structural integrity to any wall or ceiling you apply it to. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

Closed cell foam has a higher r value than open cell foam usually about 6 0 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. Phenolic foam spray insulation. Open cell foam insulation values r3 r4.

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. Corrosion problems when in contact with steel roofing moisture. 4 5 21. The r value of.