Alleghany County, VA Shrink-Swell Risk

Alleghany County, VA's soil, for shrink-swell risk

Low

Alleghany County, VA: USDA's soil survey rates 95.6% of the county "Low" for shrink-swell potential (1.58% linear extensibility). 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.

What Alleghany County's reading doesn't cover

Two lots a mile apart in Alleghany County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Alleghany County, VA 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.

Where this sits nationally

Nationally, Alleghany County, VA is the 2,404-most-constrained of 3,085 rated counties for shrink-swell soil. Within Virginia alone it ranks 106 of 114. Alleghany County covers 447 square miles and counts 14,632 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Randolph County, NC and Putnam County, FL 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 Virginia

Every county in Virginia is on this site, including Waynesboro city, VA and Chesterfield County, VA. The full underlying dataset is downloadable directly, one row per county.