Your Herndon waterproofing and foundation specialists
Herndon sits squarely in the Triassic Culpeper Basin, where the bedrock is Balls Bluff siltstone and the soils above it are notoriously expansive. From the historic downtown to surrounding subdivisions, that shrink-swell clay is the common thread behind most local foundation concerns.
Herndon's expansive basin soils
Herndon's soils form over Triassic siltstone and include shrink-swell clays that expand dramatically when wet and contract as they dry. That cyclical movement is one of the most aggressive foundation stressors in the region, and it keeps crawl spaces and basements under constant seasonal pressure.
Common crawl space & foundation problems in Herndon
Herndon homes — older homes near the W&OD trail and downtown plus surrounding suburban subdivisions — frequently show the hallmarks of expansive soil: diagonal and stair-step cracks, uneven floors, and sticking doors, alongside the crawl space humidity and seepage common across the basin.
- Aggressive shrink-swell movement from basin clays
- Diagonal and stair-step foundation cracks
- Uneven or bouncy floors over crawl spaces
- Seasonal seepage and crawl space humidity
- Sticking doors and windows from soil movement
Popular services in Herndon
Neighborhoods we serve in Herndon
We cover the Town of Herndon and nearby areas, including: Downtown Herndon · Kingston Chase · Franklin Farm · McNair · Dranesville · Folly Lick · Chandon. Don't see your neighborhood? We cover the surrounding area too — just ask.