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While insulation reduces heat transfer through walls, it cannot halt the progress of mildew-causing moisture. For that reason, building science has given birth to vapor retarders. These allow a wall cavity to dry out under humid conditions, while deterring moisture from moving into the wall in the first place. A vapor retarder may be installed separately or as a built-in component of some insulation products (e.g., SMARTBATT by CertainTeed).
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