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CyberKingfisher t1_ja0obfz wrote

You should fill that crack, preferably with a polymer-based filler. Then as this is a bathroom, you should have sealed the whole floor with a tanking kit before tiling. That way, if water finds its way through cracks in the grout, it won’t find its way through the cracks in the concrete.

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DavidM47 t1_ja0pyr2 wrote

I think you’re right that it’s a crack.

I’ve never seen such a perfect crack in a foundation before.

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