Short answer: Crawl space repair fixes the structure (sagging joists, failed piers or girders); encapsulation controls moisture with a sealed vapor barrier and usually a dehumidifier. In Charlottesville's older homes, both problems often show up together and start with moisture.
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Signs your crawl space needs work
- Bouncy, soft or sloping floors.
- Musty smell inside the house.
- Wet soil, standing water or condensation on ducts.
- Wood rot, mold growth or sagging insulation.
Typical fixes
- Supplemental jacks or piers under sagging girders, or sistered joists.
- Vapor barrier on the ground; full encapsulation seals walls and vents.
- Dehumidifier and drainage or a sump if water collects.
- Gutter and grading fixes outside.
Local context
About 5% of Charlottesville city and 8% of Albemarle County has a shallow water table, and 19% of the city's mapped soils are classed as wet enough to need drainage for normal use. Albemarle County is also EPA radon Zone 2 (moderate), so ask whether a sealed crawl space plan accounts for radon testing.
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Sources
- USDA soil survey summary for Charlottesville city (foundationsoils.com): https://foundationsoils.com/va/charlottesville-city/
- USDA soil survey summary for Albemarle County (foundationsoils.com): https://foundationsoils.com/va/albemarle-county/
- BasementSoil, Charlottesville city soil drainage: https://www.basementsoil.com/basement-risk/charlottesville-city-va.html
- EPA map of radon zones: https://www.epa.gov/radon/epa-map-radon-zones
- Virginia Department of Health, radon: https://www.vdh.virginia.gov/radiological-health/radon/