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Closed-cell foam insulation is a type of high-density spray foam known for its rigid and impermeable structure. It is produced by mixing and spraying a foam material that expands and cures into a compact, closed-cell configuration, effectively blocking air and moisture infiltration. Closed-cell foam insulation is typically applied to walls, ceilings, and roof decks, as well as to basements, foundations, and exterior walls, where it enhances structural integrity and serves as a moisture barrier.