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Is spray insulation foam waterproof?

foam insulation spray waterproof
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Is spray insulation foam waterproof?

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Yes, the foam has a closed cell structure and is therefore impervious to water. At a thickness of 3.5″ (90mm) the foam has a permeability of less than 1 perm (55ng/m2.s.Pa). This means the foam becomes a vapour barrier at this thickness. This gives the foam damp proofing capabilities.

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