Spray Foam Attic Insulation R Value

As a benchmark one inch of solid wood has an r value of 1.

Spray foam attic insulation r value.

Open cell spray foams are between 5 and 1 lbs per cubic foot and have an r value of 3 0 4 0 per inch of insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. When determining how much insulation you need don t guesstimate calculate. 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.

Open cell foam insulation values r3 r4. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. The higher the r value the greater the insulation performance.

Insulation materials run the gamut from bulky fiber materials such as fiberglass rock and slag wool cellulose and natural fibers to rigid foam boards to sleek foils. Homes insulated with it can be some of the most efficient and comfortable homes built. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. 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 values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value. It has a lower r value per inch than closed cell foam and is vapor permeable. R value measures how well certain building insulation materials can resist heat. Know exactly how much you need with our project calculators.

According to industry publication fine home building the r value for open cell spray foam is between r 3 5 r 3 6 per inch. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes. Closed cell spray foam insulation.

Focusing on spray foam insulation materials there is a difference between the two main types. Spray foam insulation is a great product. Rigid foam boards trap air or another gas to resist conductive heat flow. Insulation level are specified by r value.

R value is a measure of insulation s ability to resist heat traveling through it. Recommended home insulation r values. 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 higher the r value the better the thermal performance of the insulation.