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Question DetailsAsked on 3/28/2016

how do you fix poured basement wall leak in a finished basement

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1 Answer


Depends on where leaking - if at the slab interface, sometimes a concrete or bitumastic caulk will do it (bitumastic if wet when applying) but commonly in that situation you need to put in french drains either outside the foundation wall (better but more expensive) or under the slab leading to a sump pump.

If just a spot void or deep crack in the pour, best way is to use a hydroset mortar to seal the inner surface, with an injection tube embedded in it. After it cures, then inject epoxy grout or non-shrink concrete patch grout into the wall to fill the void. If quite small (crack or basically pencil sized or so) then a troweled in concrete joint/void filler like Dap Concrete Crack Seal (for cracks and small holes) or Waterplug grout (for larger voids/cracks that will accept a mortar consistency material) works well.

Some people have had good luck, especially with through holes from concrete form ties and such, with foam in a can, as long as water is not running out at the time. Just be careful about masking around it so you don't get it all over the concrete - VERY hard to get off. Low-expansion type for around windows works better to avoid the mess.

Answered 4 years ago by LCD

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