Highest R Value Spray Foam Insulation

Insulation is rated in two ways r value and u value.

Highest r value spray foam insulation.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. Sure code might call for r 49 in your attic and spray foam doesn t hit that number at recommended depths. Insulation level are specified by r value.

Spray foam insulation has many benefits when used correctly in any project. 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. Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. As a benchmark one inch of solid wood has an r value of 1.

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. The r value is a calculation which measures the flow of heat through an insulation product or its. R value is a measure of insulation s ability to resist heat traveling through it.

There is more to consider when buying new insulation and it comes down to r value versus creating an air seal. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. Does highest r value mean the best insulation. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

Your home doesn t necessarily need the highest r value insulation. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Open cell and closed cell. Spray foam insulation r values.

It s a popular choice for both residential and commercial construction projects. The table below shows what levels of insulation are cost effective for different climates and. For 6 inches r 15 or r 19 etc. The r value your insulation needs depends on your local climate.

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. The higher the r value the better the thermal performance of the insulation. Closed cell spray foam r values. Polyurethane and polyisocyanurate are both closed cell foams.

The common denominator among varieties of insulation is the r value. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. How to achieve r 21 in a 2x4 wall. Foam board insulation.

Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. Recommended home insulation r values. 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.