Highest R Value Spray Foam Insulation

Foam board insulation.

Highest r value spray foam insulation.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. Recommended home insulation r values. A 12 inch thick fiberglass blanket rated at r 4 is enough to reach the recommended insulation level of r 48 for attics located in zone 4. It s a popular choice for both residential and commercial construction projects.

For 6 inches r 15 or r 19 etc. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. Open cell spray foam is rated at about r 3 5 per inch while closed cell spray foam is much more efficient at r 6 0 to r 6 5 per.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Note that the material the insulation is made from will change the r value as well. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. R value is a measure of insulation s ability to resist heat traveling through it.

Two primary types of spray foam exist. Open cell and closed cell. Your home doesn t necessarily need the highest r value insulation. There is more to consider when buying new insulation and it comes down to r value versus creating an air seal.

How to achieve r 21 in a 2x4 wall. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Spray foam insulation r values. Insulation level are specified by r value.

Sure code might call for r 49 in your attic and spray foam doesn t hit that number at recommended depths. 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. Closed cell spray foam r values. Polyurethane and polyisocyanurate are both closed cell foams.

As a benchmark one inch of solid wood has an r value of 1. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. But what it can do whether it s open cell or closed cell is create an air seal.

Radiant barriers and vapor barriers are not rated by r values. Insulation is rated in two ways r value and u value. The r value is a calculation which measures the flow of heat through an insulation product or its. The r value your insulation needs depends on your local climate.

Spray foam insulation has many benefits when used correctly in any project. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. The higher the r value the better the thermal performance of the insulation.