R 30 Spray Foam Insulation Thickness

Insulation thickness to reach the r 30 value depends on the insulation material but fiberglass batts of r 30 insulation are 9 1 2 inches thick. The icc es report for insulstar spray foam from ncfi esr 1615 issued february 1 2005 lists a maximum thickness of only 2 inches. Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

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In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

R 30 spray foam insulation thickness.

Jun 11 2018 i intend to use closed cell foam in the roof walls and floor. Amongst all of the popular types of insulation currently used by the industy spray foam insulation features the highest r value per inch. Spray foam insulation r values. The higher the r value the better the thermal performance of the insulation.

Recommended home insulation r values. May 6 2019 now generically speaking we usually recommend open cell spray foam to be 6 to 10 inches on a roof deck or ceiling and 3 inches in the walls. Roof assemblies that combine spray foam with a fluffy insulation like fiberglass or. A writer using the nickname z builder responded.

Spray polyurethane foam has an r value of 6 6 per square inch of thickness. If you d like to start saving money and time today buy foam it green spray foam insulation now or call us at 800 516 0949. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Insulstar spray foam insulation is a spray applied semi rigid cellular polyurethane foam plastic insulation having a maximum thickness of 2 inches and a nominal density of 2 0 pcf.

As a benchmark one inch of solid wood has an r value of 1. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. To get to an r 25 you ll need to install an average of around 4 inches of spray foam. Rigid foam insulation provides the same r factor with approximately one half the thickness.

Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. The table below shows what levels of insulation are cost effective for different climates and. For example energy star recommends r 30 for a roof in the southern united states r 38 for the middle of the country and r 49 for the northern part of the country. Insulation level are specified by r value.

R value is a measure of insulation s ability to resist heat traveling through it. X 6 6 r value r 26 4.

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