Spray Foam Roof Insulation R Value

It performs much better than any form of batt for stopping air flow but it is not as complete of an air seal as closed cell spray foam.

Spray foam roof insulation r value.

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. 4 5 21. Innovations such as icynene proseal le allows for an initial pass of five inches 5 to achieve r 35. Open cell spray foam typically has an r value of 3 5 per inch and it should be noted that open cell does not form a tight air seal.

R value is a measure of insulation s ability to resist heat traveling through it. All these have r values ranging from r 3 2 to r 3 8 per inch. R 0 77 30 phenolic foam insulation r values. 4 8 7 21.

By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape. Recommended home insulation r values. Icynene sprayed in foam is an insulation and air seal system that works to help ensure that your home doesn t suffer from air loss while providing an effective r value. 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.

The higher the r value the better the thermal performance of the insulation. Open cell spray foam r values. Corrosion problems when in contact with steel roofing moisture. Insulation level are specified by r value.

The table below shows what levels of insulation are cost effective for different climates and. Very good air bypass leak sealing properties. The r value of closed cell foam is r 6 5 7 per inch. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Closed cell spray foam insulation is vapor and air impermeable. Using this value we were putting an r of 1 25 x 9 09 11 36 in the walls. Closed cell insulation products such as icynene proseal allow builders and architects the ability to achieve r 21 in a three inch pass. Contractors often use it to insulate under slabs ceilings walls and roofs.

In 1970 the popular number for the r value of one inch of urethane foam was 9 09 per inch. Phenolic foam spray insulation. The r value for open cell is typically around 3 7 at 1 thick and varies by manufacture. As a benchmark one inch of solid wood has an r value of 1.

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. 8 3 4 4 8 2 20. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. Closed cell spray foam insulation.