Highest R Value Spray Foam Insulation

It s a popular choice for both residential and commercial construction projects.

Highest r value spray foam insulation.

R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. How to achieve r 21 in a 2x4 wall. Closed cell spray foam r values. 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. Radiant barriers and vapor barriers are not rated by r values. But what it can do whether it s open cell or closed cell is create an air seal. Spray foam insulation has many benefits when used correctly in any project.

Open cell and closed cell. Your home doesn t necessarily need the highest r value insulation. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases.

As a benchmark one inch of solid wood has an r value of 1. Foam board insulation. Recommended home insulation r values. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

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. 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. Spray foam insulation r values. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart.

The higher the r value the better the thermal performance of the insulation. 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. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. The r value your insulation needs depends on your local climate.

The common denominator among varieties of insulation is the r value. Note that the material the insulation is made from will change the r value as well. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. 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. Polyurethane and polyisocyanurate are both closed cell foams. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Insulation level are specified by r value.

For 6 inches r 15 or r 19 etc. The table below shows what levels of insulation are cost effective for different climates and. Sure code might call for r 49 in your attic and spray foam doesn t hit that number at recommended depths.