Spray Foam Attic Insulation R Value

However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and.

Spray foam attic insulation r value.

As a benchmark one inch of solid wood has an r value of 1. Know exactly how much you need with our project calculators. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity. 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.

Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. Focusing on spray foam insulation materials there is a difference between the two main types. Homes insulated with it can be some of the most efficient and comfortable homes built. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for.

The higher the r value the better the thermal performance of the insulation. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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. 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.

Spray foam insulation is a great product. The table below shows what levels of insulation are cost effective for different climates and. Recommended home insulation r values. Open cell foam insulation values r3 r4.

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 value is a measure of insulation s ability to resist heat traveling through it. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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.

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. R value measures how well certain building insulation materials can resist heat. Closed cell spray foam insulation. When determining how much insulation you need don t guesstimate calculate.

It has a lower r value per inch than closed cell foam and is vapor permeable. 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. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. Rigid foam boards trap air or another gas to resist conductive heat flow.