What this means is that it will not allow moisture to pass through the foam.
Difference between open cell and closed cell spray foam insulation.
While most closed cell spray foams will be above 6 0 per inch open cell is much lower at 3 6 to 3 8 per inch range.
Closed cell foam is roughly four times as dense as open cell for insulation applications.
Most open cell foam has a density of about 5 pounds per cubic foot.
In density whereas closed cell ranges from 1 7 to 3 0 lb cu.
Open cell foam is not a moisture vapor barrier and will allow moisture to pass.
Open cell tends to be roughly 0 5 lb cu.
Closed cell foam is much denser than open cell foam.
As you may have expected open cell spray foam is similar to closed cell in nature.
To ascertain foam density one cubic foot cu.
Both icynene open cell and closed cell spray insulation are effective insulators with both working as barriers for air leakage.
Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.
In density or even higher for certain applications.
Generally speaking open cell foam is better suited for residential applications specifically above grade in exterior walls roof lines attic floors and areas that need soundproofing.
Open cell will expand as soon as it s applied making it the perfect foam for hard to reach areas.
Closed cell spray foam is an incredible product below grade in your basement or crawl space because of its ability to block moisture see below.
However open cell and closed cell have their different uses.
It just has a lesser r value.
The main differences between open and closed cell foam are moisture permeability r value and flexibility.