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.

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. Homes generally try and reach an r value of 38 with their insulation. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. As a benchmark one inch of solid wood has an r value of 1.

For 6 inches r 15 or r 19 etc. The overall r value of a wall or ceiling will be somewhat different from the r value of the insulation itself because heat flows more readily through studs joists and other building materials in a phenomenon known as thermal bridging. The common denominator among varieties of insulation is the r value. The table below shows what levels of insulation are cost effective for different climates and.

Closed cell spray foam insulation. All these have r values ranging from r 3 2 to r 3 8 per inch. Use the following chart to estimate an ideal r value for your insulation project. Recommended home insulation r values.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. 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. 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. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

The higher the r value the better the thermal performance of the insulation. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Closed cell spray foam r values. 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.

A higher r value prevents more heat from escaping through the insulation. 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. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. For example insulation that is compressed will not provide its full rated r value.

R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.