Open–Cell vs Closed–Cell Foam Insulation
I read a great article yesterday that listed the pros and cons of open and closed-cell foam insulation. It was written by Martin Holladay, Jim Coler and Neal Gasner a writer for Green Building Advisor, a Spray-Foam Insulation company owner and a Spray-Foam Consultant. Up until now I have typically leaned toward and specified open cell foam insulation, and I will probably still do so.
I have typically preferred open-cell foam insulation for it’s water based blowing agent and for the fact that it provides more insulation for the same amount of material as closed-cell insulation. So I would continue to use open-cell insulation where space is not an issue such as attics and below floors.
But there will definitely now be times that closed-cell insulation will be my preference.
In situations where space is limited such as stud cavities, closed-cell insulation will provide almost twice as much insulation value as open-cell insulation will in the same space for just a small increase in cost. Furthermore, closed-cell insulation is the best choice for below grade applications since it will not absorb any water.
Regardless of which type of foam insulation that you use, remember that foam insulation will also reduce air and water infiltration better than cellulose and fiberglass, significantly reduce outside noise, keep more duct and pollutants our of your house and is a great way to lower your energy bills.
Dan Bossenbroek
October 31, 2009
Tags: Energy Conservation, Insulation Posted in: Energy Conservation, Indoor Air Quality, Weatherize
One Response
I think it boils down to what problem you need to solve. I don;’t think either one is better than the other, just that each is better in certain circumstances. As you said, closed cell has a higher R-value per inch, so if space is limited, it may be the best choice. If space is not a limiting factor then the less expensive open cell foam may be a better choice. Also, open cell foam has a cleaner blowing agent, so at least from that standpoint, it’s ‘greener.’
–Dan Morrison
Managing editor, Green Building Advisor
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