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Contrary to the name, open cell spray foam is an air tight insulation solution typically used in attics, crawl spaces, or other areas where the space allotted is generous.

Open cell spray foam has more "air pockets" trapped within the plastic, so it is very light as compared to closed cell. To obtain the same insulating level as closed cell spray foam, you can expect to pay less but open cell will take up more space, since it is not as dense.

The energy co-efficient for open cell spray foam is generally R-3.5 - R-4.0 per inch.