Basements around Clarksville
Fewer houses here have basements than crawl spaces, and many that do are walk-outs cut into a slope. That shape matters. The uphill wall holds back soil that soaks up every storm, while the downhill side stands open to daylight. Water pressure builds against one or two walls, not all four.
How an interior drain works
A strip of the concrete floor is cut out along the wet walls. A perforated pipe is laid in gravel beside the footing, sloped toward a sump pit, and the floor is patched over it. Water that rises under the slab or runs down the inside of the wall drops into the pipe and is pumped out.
On block walls, small holes are often drilled into the bottom course so water trapped in the hollow cores can drain into the pipe instead of sitting in the wall.
Barriers and coatings, and their limits
- Wall liner
- A plastic sheet or dimpled board fixed to the wall. It does not stop water coming through. It guides it down behind the sheet to the drain, so the room side stays dry.
- Masonry paint
- Waterproofing paint can hold back dampness for a time. Against real water pressure it blisters and peels, and it hides the evidence a later inspector would want to see.
- Crack injection
- Useful when one crack is the whole problem. That job is covered under basement leak repair.
What the work does to the house
Cutting concrete is loud and dusty, and the spoil is carried out in buckets. Finished walls along the drain usually lose their bottom section, and anything fixed to the floor there, such as a furnace platform, stairs or a bathroom wall, complicates the route. Ask how the dust will be contained and who puts back the finishes.
What to ask
- Which walls get a drain, and why those and not the others?
- Where will the sump pit sit, and is a battery backup pump included?
- How is the patched floor finished, and will it match the level of the old slab?
- If the basement is finished, who removes and replaces drywall, trim and flooring?
- Does the warranty cover the whole basement or only the walls that were drained?