Spray Foam Insulation R Value Chart

The closed cell spray foam stops air infiltration and provides about an r 5 per inch.

Spray foam insulation r value chart. 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. It has a lower r value per inch than closed cell foam and is vapor permeable. Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Homes generally try and reach an r value of 38 with their insulation. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity. 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.

Use the following chart to estimate an ideal r value for your insulation project. 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. Closed cell spray foam insulation.

Products with a higher r value provide greater insulation. Insulate rim joists and other large areas with this product meant for big jobs. 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. As a benchmark one inch of solid wood has an r value of 1.

A higher r value prevents more heat from escaping through the insulation. Open cell foam insulation values r3 r4. Made with plant based products such as soy eco spray foam is more eco friendly. 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 is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. As always should you have any questions or require any assistance in planning your spray foam insulation job please contact us we are always happy to help. The r value of spray foam insulation is approximately 6 per inch so those using spray foam as their insulator will need about 6 3 inches of thickness to reach r 38. Eco spray foam insulation.

Rigid foam boards trap air or another gas to resist conductive heat flow. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.