Open Cell Spray Foam Insulation 
For Electric & Natural Gas Customers

Open cell spray foam insulation provides a lesser R-value per inch, is also called half-pound foam, and has a density of about 0.5 lb. per cubic foot and an R-value of 3.5 or 3.6 per inch. Open cell foam allows vapor to pass through it. The bubbles in the foam touch each other and are open to other bubble permiting liquids or gases to pass through. Open cell foam may also require an interior vapor retarder, so check with your local insulator for more information. One area where open cell foam out performs closed cell foams is in sound deadening. Most sound travels through air movement. Both open and closed cell foams are air barriers and therefore good sound barriers. This means that both foams will do a good job of “blocking” or “deflecting” external noise from your buildings or other insulated spaces. Open cell foams, however, will in effect “absorb” the sound as does carpet, soft furniture and heavy drapes or tapestries.
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