Spray Foam Insulation R Value Chart

Rigid foam boards trap air or another gas to resist conductive heat flow.

Spray foam insulation r value chart.

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

Products with a higher r value provide greater insulation. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Use the following chart to estimate an ideal r value for your insulation project. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

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. As a benchmark one inch of solid wood has an r value of 1. 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 closed cell spray foam stops air infiltration and provides about an r 5 per inch.

Choose foam it green spray foam insulation kits and don t settle for less than you deserve. 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. Insulate rim joists and other large areas with this product meant for big jobs. It has a lower r value per inch than closed cell foam and is vapor permeable.

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

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