Spray Foam Attic Insulation R Value

Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity.

Spray foam attic insulation r value.

The table below shows what levels of insulation are cost effective for different climates and. 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. Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

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 higher the r value the greater the insulation performance. 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. 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.

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. 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. R value is a measure of insulation s ability to resist heat traveling through it. 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.

When determining how much insulation you need don t guesstimate calculate. Insulation level are specified by r value. Know exactly how much you need with our project calculators. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Closed cell spray foam insulation. Open cell foam insulation values r3 r4. 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 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.

R value measures how well certain building insulation materials can resist heat. Homes insulated with it can be some of the most efficient and comfortable homes built. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Spray foam insulation is a great product.

It has a lower r value per inch than closed cell foam and is vapor permeable. As a benchmark one inch of solid wood has an r value of 1. Rigid foam boards trap air or another gas to resist conductive heat flow. Focusing on spray foam insulation materials there is a difference between the two main types.