Your Fairfax waterproofing and foundation specialists
The City of Fairfax and the surrounding communities sit where Piedmont uplands meet the eastern edge of the Triassic Culpeper Basin. That geologic boundary means soils — and the moisture problems they cause — can change from one subdivision to the next, so we inspect before we prescribe.
Fairfax's soils
Much of Fairfax sits on clay-heavy saprolite that drains poorly and swells when wet, while pockets to the west grade into Triassic siltstone and shrink-swell clays. Both hold water against foundations and crawl space walls, and both move seasonally — the source of the stair-step cracks and sticking doors many Fairfax homeowners notice.
Common crawl space & foundation problems in Fairfax
Fairfax's homes range from 1950s ramblers to 1990s colonials and newer infill. Older homes have vented crawl spaces that pull in humid summer air; newer ones often have grading and downspout issues that send roof water straight to the foundation. Expansive clay underneath ties it all together with seasonal movement.
- Humid, vented crawl spaces under older ramblers
- Stair-step cracks from expansive clay movement
- Roof and grading runoff pooling at the foundation
- Sticking doors and windows from seasonal soil swell
- Musty odors and elevated indoor humidity
Popular services in Fairfax
Neighborhoods we serve in Fairfax
We cover the City of Fairfax and nearby communities, including: Old Town Fairfax · Fairfax Station · Mantua · Kings Park West · Fair Oaks · Mosby Woods · Greenbriar · Penderbrook · Country Club Hills. Don't see your neighborhood? We cover the surrounding area too — just ask.