Floyd County, KY Shrink-Swell Risk
What Floyd County, KY's soil means for a foundation
Low
USDA's SSURGO data puts Floyd County, KY's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 0.95% across 98.7% of the county's surveyed land. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.
This is a county figure, not a lot figure
USDA's survey covers the whole of Floyd County, KY at once, not any single address. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Floyd County will actually do.
Report cost vs. repair cost
With Floyd County, KY rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.
Floyd County's rank among Kentucky counties
Nationally, Floyd County, KY is the 2,917-most-constrained of 3,085 rated counties for shrink-swell soil. Within Kentucky alone it ranks 119 of 120. Floyd County, KY is 393 square miles with a population of 34,532.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Warren County, IA and Granite County, MT are worth a look for comparison.
How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil
More of Kentucky
Every county in Kentucky is on this site, including Garrard County, KY and Wolfe County, KY. The full underlying dataset is downloadable directly, one row per county.