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Old 06-19-2008, 06:25 AM   #1
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Waterproofing holes?


We just drilled two through our foundation wall for conduit allowance. One is 5" and the other is 2".
-The first layer is 4" block that supports the brick above.
-The second is concrete filled block.

There below grade, how would I properly waterproof these holes?

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Old 06-19-2008, 09:12 AM   #2
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Waterproofing holes?


If there is an annulus around the conduit that would allow you to pack it with hydraulic cement, that would be my recommendation. Mixed to about the consistency of peanut butter, hydraulic cement is very workable and can be forced into the gap. It won't shrink as it dries, so it is great for sealing gaps and cracks in foundations below grade. It is sold in small bags or tubs.

Caulk is a poor option, and I would avoid it.

There are other epoxy-type sealants that would work well also. They'd have to be bought from a construction specialty supplier, not a box store.

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Old 06-19-2008, 11:23 PM   #3
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Waterproofing holes?


I bought a 5 lb. bag of the hydraulic cement.

Can this cement be mixed too allow it to flow, more watery?
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Old 06-19-2008, 11:44 PM   #4
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Waterproofing holes?


I'd avoid doing that. With concrete-type products, more water equals less strength in the finished product.

Aim for a plastic, peanut butter consistency. Use a margin trowel or something similar to pack it into the gaps.
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Old 06-21-2008, 12:06 AM   #5
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Waterproofing holes?


thank you KC!
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Old 06-21-2008, 06:33 AM   #6
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Waterproofing holes?


for best results, do the packing from the outside, too,,,coat patch w/asphalt roofing cement several times over DRY block if possible.

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