Polyurethane Foam Insulation R Value

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Polyurethane foam insulation r value.

This makes it ideal for insulating roof assemblies that need to dry inward. 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. Lower strength and rigidity. Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

Phenolic foam spray insulation. 4 8 7 21. Open cell foam is permeable to moisture but impermeable to air. The r value goes up as the temperature drops.

There are two types of polyurethane spray foam insulation. 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. By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape. As a result of the high thermal resistance of the gas spray polyurethane insulation typically has an initial r value around r 3 4 to r 6 7 per inch.

1 per bsaf 1 cu ft. Air barrier at full wall thickness. Expect an r value of about 3 6 per inch. Important for people living in the north such as minnesota is that the r value at 0 degrees f is 4 55.

R 0 77 30 phenolic foam insulation r values. In comparison glass wool typically has an r value of only r 3 to r 4 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. 8 3 4 4 8 2 20.

Icynene sprayed in foam is an insulation and air seal system that works to help ensure that your home doesn t suffer from air loss while providing an effective r value. 4 5 21. Eps has an r value of 3 85 at 75 degrees f. Polyurethane is a closed cell foam insulation material that initially contains a low conductivity gas in its cells.

Very good air bypass leak sealing properties. Corrosion problems when in contact with steel roofing moisture. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch.