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spencerin
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# Posted: 24 Aug 2021 12:49am - Edited by: spencerin
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I'm considering using self-leveling concrete to fill the bottom of a pit (it's really a vertically-installed 18"-diameter double-walled pipe without a bottom) to keep water from entering the pit from below. Would this seal the seams where it meets the pipe wall? Or, would I need to use concrete caulk? Also, the thickness of the pour will vary because the substrate is uneven. Just wondering if this seems like a good idea or not.
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Brettny
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# Posted: 24 Aug 2021 08:01am
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Concrete isnt water proof. This is for a pump pit of a non submersible pump? Cant you find a submersible pump?
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spencerin
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# Posted: 24 Aug 2021 10:08am
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Yes. Can't do a submersible pump without significant additional rework/cost. The existing pit already has a drain installed, but I'm looking for ways to better seal it up. Isn't concrete essentially waterproof provided there are no cracks or unsealed seams for water to enter?
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NorthRick
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# Posted: 26 Aug 2021 03:45pm
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If the water you are talking about is groundwater that fluctuates in elevation during the year, it is probably going to find a way past that concrete.
Given that you wouldn't need a lot so it wouldn't be that expensive, I'd give it a try. If your groundwater issues are short term it might work well enough to make a difference.
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