Highest R Value Spray Foam Insulation

Insulation level are specified by r value.

Highest r value spray foam insulation.

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 higher the r value the better the thermal performance of the insulation. But what it can do whether it s open cell or closed cell is create an air seal. Closed cell spray foam r values.

How to achieve r 21 in a 2x4 wall. The common denominator among varieties of insulation is the r value. Radiant barriers and vapor barriers are not rated by r values. It s a popular choice for both residential and commercial construction projects.

Open cell and closed cell. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. The table below shows what levels of insulation are cost effective for different climates and. Polyurethane and polyisocyanurate are both closed cell foams.

Two primary types of spray foam exist. Insulation is rated in two ways r value and u value. Your home doesn t necessarily need the highest r value insulation. Spray foam insulation has many benefits when used correctly in any project.

The open cell structure of low density foam insulation means the r value is lower than its closed cell counterpart. The r value is a calculation which measures the flow of heat through an insulation product or its. Recommended home insulation r values. 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.

They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. 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.

Spray foam insulation r values. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Sure code might call for r 49 in your attic and spray foam doesn t hit that number at recommended depths. Note that the material the insulation is made from will change the r value as well.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. As a benchmark one inch of solid wood has an r value of 1. 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. The r value your insulation needs depends on your local climate.

Nevertheless open cell spray foam does offer superior and consistent thermal insulation and air sealing properties. Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. For 6 inches r 15 or r 19 etc.