Spray Foam Attic Insulation R Value

When determining how much insulation you need don t guesstimate calculate.

Spray foam attic insulation r value.

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. 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.

Insulation level are specified by r value. 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. 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. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity.

Recommended home insulation r values. 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. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. 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. 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. 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. The table below shows what levels of insulation are cost effective for different climates and.

The higher the r value the better the thermal performance of the insulation. 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. As a benchmark one inch of solid wood has an r value of 1. Open cell foam insulation values r3 r4.

It has a lower r value per inch than closed cell foam and is vapor permeable. Spray foam insulation is a great product. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and.

Focusing on spray foam insulation materials there is a difference between the two main types. Closed cell spray foam insulation. Know exactly how much you need with our project calculators. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.