My Tenants moved out yesterday, and they showed me that there is some water under the livingroom laminate floor, and they have been noticing it for a while. Upon the inspection, I found out that the toilet tank in the room was so loose that it was wobbling badly, but they didn't bother telling me. So the water travelled to the living room (5-6 feet from that washroom). I removed the whole laminate and letting the concrete dry.
As you can see in the picture, there is a very thin crack; Does this crack matter? It was there 6-7 years ago when I change the floor. I was wondering if this can cause trouble and if this was the reason of water (There was so much water under the laminate that if you press the floor, it will come out from the edges of the floor.
During the research, I found out the there are sealers that can be applied; Please suggest any sealant to prevent any moisture in future.
To answer your question about the crack in the concrete: from what I can interpret from your photo, the crack does not look like a serious structural issue. Also, I do not believe it's the source of the water. Best way to address this, is to repair the leaking toilet and ensure there is no other source of water coming into the basement. The only benefit of using a concrete crack filler would be in case of future flooding that the water doesn't travel into the crack and cause degradation in within the concrete slab. If by any chance you find water entering through the crack (highly unlikely from the photo), then you need to investigate further about a broken main drain pipe (possibly backed up) or underground water rising seasonally. Hope this helps. Best of luck.
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