· by Michael Blair, Nashville's Foundation Repair
Most basement water in Middle Tennessee is roof and surface water that was allowed to collect against the foundation. Interior systems manage water that has already got in; the cheaper work happens outside first.
Start outside, always
Gutters clear and correctly sized, downspouts discharging well away from the wall, and grade falling away from the house. That sequence resolves a surprising share of wet basements on its own.
It is also the cheapest work available, which is why a contractor who proposes an interior system without discussing the exterior deserves a second opinion.
Where the water is entering
At the cove joint where wall meets floor is the classic, and it indicates hydrostatic pressure under the slab. Through a wall crack indicates a specific path. Over the top of the wall indicates grading.
Watching during a storm with a torch is genuinely informative, and it costs nothing.
- Gutters, downspouts and grading first
- Note where water appears during actual rain
- Cove joint entry suggests hydrostatic pressure
- Wall crack entry can be injected
- Efflorescence marks where water has been moving
Interior versus exterior systems
An interior perimeter drain and sump collects water at the footing and pumps it out. It is disruptive but less so than excavation, and it manages water reliably.
Exterior waterproofing excavates and treats the wall from outside, addressing water before it reaches the structure. It costs considerably more and is the more complete solution.
Sump pumps and power
A sump pump is only as reliable as its power supply, and Middle Tennessee storms that produce the water frequently produce the outage too.
A battery backup or water-powered backup is not an upsell in this climate. So is testing the pump periodically rather than discovering it has seized during the storm.