Observed arrival · 2026-10-25
Crawl Space Map: county soil risk and vent sizing
A county lookup estimates crawl-space moisture risk from soil and radon data, alongside a calculator for sizing vents under IRC R408.
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- For
- Homeowners assessing crawl-space moisture and ventilation
- Worth noticing
- It reports 2,700 county scores and identifies 257 as high-moisture, with the scoring method and data sources linked.
Field notes
The page describes its county scores as weighted from USDA NRCS SSURGO soil-survey attributes, including drainage class, hydrologic group, seasonal water-table depth, and flooding frequency. It reports 257 high-moisture counties, 534 elevated, and 843 moderate; the remaining 1,066 are listed on state pages. Its code references include 2012 IRC R408 text published by Georgia and an unvented-crawl-space provision adopted in South Carolina.
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