Armstrong County, PA Shrink-Swell Risk

What Armstrong County, PA's soil means for a foundation

Low

USDA's SSURGO data puts Armstrong County, PA's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.29% across 93.4% of the county's surveyed land. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

This is a county figure, not a lot figure

USDA's survey covers the whole of Armstrong County, PA at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Armstrong County.

Report cost vs. repair cost

With Armstrong County, PA 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, Armstrong County, PA is the 2,708-most-constrained of 3,085 rated counties for shrink-swell soil. Within Pennsylvania alone it ranks 51 of 67. Armstrong County, PA is 653 square miles with a population of 63,679.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Logan County, KS and Jim Hogg County, TX 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 Pennsylvania

Every county in Pennsylvania is on this site, including Bedford County, PA and Philadelphia County, PA. The full underlying dataset is downloadable directly, one row per county.