I have an unfinished basement in 40 year old home. Block walls are extremely clean and show no signs of water having come down or through them from ground outside but when it rains for a couple of days, I have a small puddle, and by small, not even a half inch deep or a foot wide, on floor by wall. Since I have ruled out surface water, where is it coming from? Could it be coming in where the flor meets the wall from some underground source and if so, why only when it rains? Is there something I can use to seal the joining of wall and concrete floor or seal block? I would like to finish basement but don't dare put in insulation and drywall with this unresolved.
Water – How to stop a water leak in the basement
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Best Answer
We can only guess at this point, but one theory is that when it rains, you have water seeping down the outside of your foundation until it hits the footer, at which point it's seeping into your basement.
At the point where you have this puddle, what is outside? Is there a gutter downspout there? Or perhaps the ground is sloping towards your house at that spot? Check those things first.