Spray Foam Attic Insulation R Value

Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

Spray foam attic insulation r value.

The table below shows what levels of insulation are cost effective for different climates and. Homes insulated with it can be some of the most efficient and comfortable homes built. When determining how much insulation you need don t guesstimate calculate. Know exactly how much you need with our project calculators.

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. Recommended home insulation r values. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

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. R value is a measure of insulation s ability to resist heat traveling through it. 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. Focusing on spray foam insulation materials there is a difference between the two main types.

Insulation level are specified by r value. However there are open cell spray foam insulation products actually offer r 3 7 per inch such as icynene classic and. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The higher the r value the better the thermal performance of the insulation.

Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity. It has a lower r value per inch than closed cell foam and is vapor permeable. 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. The higher the r value the greater the insulation performance.

Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. 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. Closed cell spray foam insulation. R value measures how well certain building insulation materials can resist heat.

I can also tell you that 73 of all statistics are made up on the spot so please don t ask for. Spray foam insulation is a great product. 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. Open cell foam insulation values r3 r4.