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Apr 8, 2023 at 14:14 comment added keshlam Hydraulic cement expands as it cures, which makes a pretty good seal to surrounding cement in most cases. Yes, waterproofing from outside is generally better, and might make removing the pipes easier by letting you attack them with a recip saw, but for the small trickle we're seeing in the photo I'm not sure it's worth the effort. Not sure it isn't, either, but I'd try the lazy fix first.
Apr 8, 2023 at 14:02 comment added Huesmann I would expect water to find its way around hydraulic cement too. IMO the right way to seal that hole would be to dig down outside and seal it there.
Apr 7, 2023 at 17:22 history edited keshlam CC BY-SA 4.0
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Apr 7, 2023 at 13:01 history answered keshlam CC BY-SA 4.0