Vapor barriers aren’t necessarily insulation, but many types of insulation require them to do their job properly. These impermeable vapor retarders reduce the amount of moisture from traveling through the exterior walls, helping prevent mold and mildew on the wall framing, drywall, or even the insulation facing. The act of installing ICFs isn’t terribly difficult, but the forms themselves are quite expensive compared to reusable wood forms. But they provide an automatic vapor barrier, and if the homeowner is planning to use the area within the concrete walls as a finished space, the cost is worth it.
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