Highest R Value Spray Foam Insulation

Two primary types of spray foam exist.

Highest r value spray foam insulation.

Spray foam insulation r values. Spray foam insulation has many benefits when used correctly in any project. How to achieve r 21 in a 2x4 wall. Sure code might call for r 49 in your attic and spray foam doesn t hit that number at recommended depths.

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. But what it can do whether it s open cell or closed cell is create an air seal. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. The r value is a calculation which measures the flow of heat through an insulation product or its. Open cell and closed cell. 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. It s a popular choice for both residential and commercial construction projects. Polyurethane and polyisocyanurate are both closed cell foams. Insulation level are specified by r value.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. Does highest r value mean the best insulation. Radiant barriers and vapor barriers are not rated by r values. The higher the r value the better the thermal performance of the insulation.

For 6 inches r 15 or r 19 etc. Note that the material the insulation is made from will change the r value as well. The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

There is more to consider when buying new insulation and it comes down to r value versus creating an air seal. As a benchmark one inch of solid wood has an r value of 1. The r value your insulation needs depends on your local climate. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

R value is a measure of insulation s ability to resist heat traveling through it. Your home doesn t necessarily need the highest r value insulation. Insulation is rated in two ways r value and u value. Foam board insulation.

The table below shows what levels of insulation are cost effective for different climates and. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. Closed cell spray foam r values.