Spray Foam Attic Insulation R Value

Focusing on spray foam insulation materials there is a difference between the two main types.

Spray foam attic insulation r value.

I can also tell you that 73 of all statistics are made up on the spot so please don t ask for. It has a lower r value per inch than closed cell foam and is vapor permeable. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. 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.

Rigid foam boards trap air or another gas to resist conductive heat flow. Homes insulated with it can be some of the most efficient and comfortable homes built. The table below shows what levels of insulation are cost effective for different climates and. Open cell foam insulation values r3 r4.

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. The higher the r value the better the thermal performance of the insulation. 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Know exactly how much you need with our project calculators. 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. 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.

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

The higher the r value the greater the insulation performance. R value is a measure of insulation s ability to resist heat traveling through it. When determining how much insulation you need don t guesstimate calculate. 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.

As a benchmark one inch of solid wood has an r value of 1. Insulation level are specified by r value. R value measures how well certain building insulation materials can resist heat. 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.