Closed-Cell Foam Superior Air-seal Superior Air-seal High R-value High R-value Typically used in walls as part of a flash and batt system Typically used in walls as part of a flash and batt system Requires use of an ignition/thermal barrier (can NOT be left exposed in unvented attics or crawl spaces) Requires use of an ignition/thermal barrier (can NOT be left exposed in unvented attics or crawl spaces) Closed cell structure does not allow bulk water intrusion.
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