Highest R Value Spray Foam Insulation

Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value.

Highest r value spray foam insulation.

Spray foam insulation has many benefits when used correctly in any project. R value is a measure of insulation s ability to resist heat traveling through it. Two primary types of spray foam exist. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

Note that the material the insulation is made from will change the r value as well. Insulation is rated in two ways r value and u value. 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.

For 6 inches r 15 or r 19 etc. Closed cell spray foam r values. Foam board insulation. Recommended home insulation r values.

But what it can do whether it s open cell or closed cell is create an air seal. 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. 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. Your home doesn t necessarily need the highest r value insulation. Radiant barriers and vapor barriers are not rated by r values. The r value your insulation needs depends on your local climate.

How to achieve r 21 in a 2x4 wall. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. The common denominator among varieties of insulation is the 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.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. The table below shows what levels of insulation are cost effective for different climates and. 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. The r value is a calculation which measures the flow of heat through an insulation product or its.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Open cell and closed cell. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. Insulation level are specified by r value.

Polyurethane and polyisocyanurate are both closed cell foams. It s a popular choice for both residential and commercial construction projects. As a benchmark one inch of solid wood has an r value of 1.