Start with conditions, not a product
Treating what's visible without correcting what's feeding it is a temporary fix at best. The plan that actually works identifies the water's entry point, accounts for ongoing humidity, evaluates material damage, defines containment, and specifies how the result gets verified once the correction is made.
Build a complete scope
- The moisture source, established before any cleaning is quoted
- Whether uphill groundwater or attic ventilation is driving it
- How the work area is contained, harder in open early-1900s framing
- What is removed versus cleaned, and the basis for that decision
- Verification afterward, plus the drainage or venting fix that prevents a repeat
Asheville context
Retaining walls, French drains, and cut-and-fill grading are common on Asheville's hillside lots, and when any one of them fails or was never properly installed, water tends to find its way toward the uphill side of a foundation rather than away from it, which is the opposite of what a flatter lot usually has to manage.