8 3 4 4 8 2 20.
Spray foam roof insulation r value.
In 1970 the popular number for the r value of one inch of urethane foam was 9 09 per inch.
As a benchmark one inch of solid wood has an r value of 1.
The higher the r value the better the thermal performance of the insulation.
Using this value we were putting an r of 1 25 x 9 09 11 36 in the walls.
Insulation level are specified by r value.
Recommended home insulation r values.
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.
Corrosion problems when in contact with steel roofing moisture.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
R value is a measure of insulation s ability to resist heat traveling through it.
Innovations such as icynene proseal le allows for an initial pass of five inches 5 to achieve r 35.
The table below shows what levels of insulation are cost effective for different climates and.
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.
Closed cell spray foam insulation.
In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.
4 8 7 21.
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 r value of closed cell foam is r 6 5 7 per inch.
Closed cell spray foam insulation is vapor and air impermeable.
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.
Phenolic foam spray insulation.
All these have r values ranging from r 3 2 to r 3 8 per inch.
4 5 21.
Closed cell insulation products such as icynene proseal allow builders and architects the ability to achieve r 21 in a three inch pass.
Very good air bypass leak sealing properties.
By expanding 100 times its original size icynene seals cracks and gaps in attics walls ceilings and other spaces where air might escape.
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.
So let s find out what you need and discuss how you can get there effectively but also cost efficiently.
The r value for open cell is typically around 3 7 at 1 thick and varies by manufacture.
Contractors often use it to insulate under slabs ceilings walls and roofs.
R 0 77 30 phenolic foam insulation r values.
Open cell spray foam r values.
