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Although crawlspaces are not recommended in flood-prone areas, they can be designed or retrofitted to greatly increase resistance to flood damage.
Flood vents allow floodwaters to enter and exit the crawlspace without causing hydrostatic pressure differences
Moisture can migrate from below the foundation to the basement wall and insulation cavity in a conventional blanket insulation installation
New Charleston, SC home's first level used as parking, storage, and access space
The risk of hydrostatic pressure differences in a flood is reduced when the interior grade of the crawlspace is higher or equal to the exterior grade.
The water heater and other appliances are located above the Base Flood Elevation.
This floor assembly above a vented crawlspace controls vapor and heat transmission by using foil-faced isocyanurate rigid foam insulation installed underneath the floor joists and fiberglass insulation in the floor joist cavities