Spray Foam Insulation R Value Chart

Open cell spray foam insulation is air impermeable and is applied with a minimum of 3 5 on average and can be used for attics interior floors walls and soundproofing.

Spray foam insulation r value chart.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Use the following chart to estimate an ideal r value for your insulation project. 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. Bulky materials resist conductive and to a lesser degree convective heat flow in a building cavity.

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 closed cell spray foam stops air infiltration and provides about an r 5 per inch. 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. 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. Traditional insulation such as cellulose or fiberglass is not comparable to spray foam insulation in r value as those insulation methods use r value of heat transfer. 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. Choose foam it green spray foam insulation kits and don t settle for less than you deserve.

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. 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. Made with plant based products such as soy eco spray foam is more eco friendly. Homes generally try and reach an r value of 38 with their insulation.

Eco spray foam insulation. Insulate rim joists and other large areas with this product meant for big jobs. Closed cell spray foam insulation. Rigid foam boards trap air or another gas to resist conductive heat flow.

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 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

A higher r value prevents more heat from escaping through the insulation. 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.