about waterproofing basement wall

Old 10-23-19, 02:52 PM
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about waterproofing basement wall

someone asked me about his basement that was leaking from drips/cracks through the wall I beleive was the problem. Someone already came to fix this and they drilled holes right through the cinderblock into the earth on the other side to allow water to leak into the basement, and then into the french drain and finally out the sump pump (this is a thing to just drill holes in the wall apparently...). I said that'll be great for making black mold and that around %80 of the air breathed in a house comes from the basement. They also put plastic sheeting over the cinderblock wall after drilling the holes as if to contain the moisture within the sheet and prevent any mold/moisture problems, which, yes I know crawlspace floors are wrapped in thick white membrane but this plastic over the cinderblock wall just seemed like black mold waiting to happen. So anyway, this drilling didn't solve anything and I think it might have caused some mold issues.

Water comes from the backyard sloped towards the house. The back is all pavers and an inground pool. I know the polymeric sand and sealer in the pavers needs to be redone because the cracks are full of weeds. I'm thinking water seeps through the pavers and then into the sand base and then hits the soil and then meets the foundation wall at least 2 feet down.

He then had someone dig about 1 foot down along the back of the house and install a white drain pipe with holes in it (the kind with holes only on one side of the pipe I beleive), and connected it at the corner to the underground pipe which takes the gutter and sump pump water out to the street - this exterior drainage pipe installation also didn't solve anything. The backyard is all pavers tight to the house, except for most of the basement wall is up against a landscape bed with bushes and soil which has a 5" tall brick edge, so water that sheds down the patio doesn't even really make its way into the landscape bed beyond the 5" tall brick edging, so the 1' deep pipe didn't do anything really.

The guy asked me about digging out along the whole basement wall down to the foundation about 7 feet to install black membrane plastic on the outside. I said I'm not familiar with this and might be overkill but he said it was the end-all-be-all solution he had gotten from basement waterproof contractors.

I cleaned the gutters and ran a lot of water through them and discovered the underground pipe that takes the gutter and sump pump water to the curb was clogged because no water was coming out the end. We put a garden hose in the sump pump and let it run a good 20 mins and the sump pump was going off several times and we could see it filling the main exit street pipe but no water was coming out, so I said maybe all he needed the whole times was to just get that pipe snaked, or I think the pipe might also be cracked because the water wasn't spewing up from where the sump pump pours into it.
I'm surprised out of the several basement waterproofing specialists who looked at and worked on this didn't address this issue first that the sump pump water wasn't even making its way to the street.

He had the pipe that leads to the street snaked out.
Recently I found he was having the whole foundation dug out down to the foundation about 7' down and putting membrane on the foundation exterior.
I guess it still leaked in the basement after he had the exit pipe snaked to the street.

So basically, if for some reason there isn't already an exterior perimiter pipe to take the water to the sump pit, then that of course should be installed, but I think it already does have that, so basically since the soil seems on the clay'y side and water just sits there against the house and doesn't drain down into the pipe, add that with freezing and expansion of the water, so the solution is to dig the whole thing out and put black membrane against the house?

What about simply cutting out a strip of the pavers near the house and installing a drain channel flush with the top of the pavers? something like when you google "patio pool drain"? Wouldn't that work if the pavers are kept sanded and sealed, then most of the water should just enter this drain and then directed away. Yes there is a bit more of uphill yard in the yard behind this one (this yard is all pavers remember) and so that water can seep deeper than the pavers and slowly makes it way to the foundation wall and bypass the drain flush with the top of the pavers, but wouldn't the 'patio pool drain' take care of most of the water?

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