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There are two basic types of Foam Insulation. Open cell 1/2 pound semi-rigid foam (Sealection500) and Closed cell 2 pound ridged foam ( Heatlok Soy).

Open cell foam is a semi-rigid, 1/2 pound, low density, water blown foam designed to be used indoors only. Just like its name implies, the cells are open and relies on trapping air inside of the foam to insulate and air seal. The blowing agent in open cell foam is water, this helps the reaction process respond. There are no toxic gases used or released in the process of creating open cell foam insulation. Open cell foam is sprayed into place as a two part liquid and expands about 120 times itself and cures into place in a matter of seconds. Most open cell foams have a R-value of 3.5 to 3.8 per inch. They also have the best cost per R-value of foam insulation. It contains no ozone depletion chemicals, CFC, HCFC, fibers, formaldehyde or asbestos. They work great as an air seal and for sound control.

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Closed cell 2 pound foam is a rigid, medium density foam, that uses a hydrofluorocarbon as a blown agent that is ozone safe and contains no volatile organic compounds (VOC). This blown agent is trapped inside the closed cells and helps increase the R-value, sort of like Argon is used in windows to increase the efficiency. Closed cell foam is also sprayed into place as two part liquid and expands into place about 30 to 40 times its self in seconds. Most closed cell foams have an aged R-value of 6 to 7 per inch and can be used as a vapor retarder after 1.5 inches, depending on the manufactures testing. They work great indoors or outdoors and is also an air seal. When used outside they must be protected from U.V. light. Closed cell is considered water proof after 1.5 inches and should not be used on roof undersides due to the fact if the roof ever leaks the water will set on top of the foam and will ruin the roof structure.

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