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Old 06-27-2019, 01:05 PM   #1
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Basement Waterproofing


I have a roughly 2200 sq ft 2 story house with a basement built in 1999. I have owned the home for approximately 8 months and during large rain events I have noticed a small puddle in a corner of the basement. Over time there have been some water stains coming through the painted block (outside wall approximately 8 feet underground on one wall and completely underground on front wall). I have installed new gutters as well as underground 4 inch PVC pipe to take water from downspouts all the way down to the lake. There is a slight grade away from the house and there are no pools of water anywhere outside the house after a heavy rain. I'm currently in the process of the next step and installing an interior sump pump in the basement. After jackhammering up the floor I've learned the slab was poured directly onto the dirt, no gravel. Due to the lack of gravel I anticipate the sump pump being pretty much worthless as drainage through sandy clay will be minimal. Asking for any and all suggestions on my next step. My initial thought was to do a lot of digging and dig down below the footer and drill up vertically through the footer to at least drain the block. Then backfilling with drain tile leading to sump pump and plenty of large aggregate gravel. Any ideas on structural consequences for a cavity of about 4 inches wide below the footer? Any direction or wisdom is much appreciated
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Old 06-27-2019, 01:27 PM   #2
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Re: Basement Waterproofing


You are correct that an after-the-fact sump with no pipes will only drain maybe a couple feet around it, but if you have a high water table over time that can lower it.

I didn't understand the description of the grade compared to the basement walls. But I'm not sure how you could drill up from below a footer (bit length, drill length, holding torque). I don't think that would be needed. If you are going to or have already dug outside anyway, attack it out there with waterproof membrane, dimpled membrane, and you're on the right path with extra french drains (probably doesn't even have a footing drain tile) and connecting them to this planned sump. Water in the block can be drained from outside at the base of it.
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Old 06-27-2019, 06:16 PM   #3
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Re: Basement Waterproofing


Quote:
Originally Posted by Lakehousemiss View Post
I have a roughly 2200 sq ft 2 story house with a basement built in 1999. I have owned the home for approximately 8 months and during large rain events I have noticed a small puddle in a corner of the basement. Over time there have been some water stains coming through the painted block (outside wall approximately 8 feet underground on one wall and completely underground on front wall). I have installed new gutters as well as underground 4 inch PVC pipe to take water from downspouts all the way down to the lake. There is a slight grade away from the house and there are no pools of water anywhere outside the house after a heavy rain. I'm currently in the process of the next step and installing an interior sump pump in the basement. After jackhammering up the floor I've learned the slab was poured directly onto the dirt, no gravel. Due to the lack of gravel I anticipate the sump pump being pretty much worthless as drainage through sandy clay will be minimal. Asking for any and all suggestions on my next step. My initial thought was to do a lot of digging and dig down below the footer and drill up vertically through the footer to at least drain the block. Then backfilling with drain tile leading to sump pump and plenty of large aggregate gravel. Any ideas on structural consequences for a cavity of about 4 inches wide below the footer? Any direction or wisdom is much appreciated
Here is a link to my response to another poster with a wet basement issue. I am thinking that you might need a perimeter drainage system installed in the basement. In that type of installation weep holes are drilled below the floor, not below the footing and water trickles into a drainage pipe which drains into a sump hole.

https://www.diychatroom.com/f105/moi...1/#post5835799
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Old 06-27-2019, 06:44 PM   #4
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Re: Basement Waterproofing


Not a good idea to dig under or adjacent to that footing.
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Old 06-29-2019, 08:45 AM   #5
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Re: Basement Waterproofing


alongside footer's fine but under not so good UNLESS you need an underpinning,,, u-tube's got plenty of how-to's,,, IF you have wtr in floor's ctr, (spring or hydraulic), may need lateral piping to perimeter pipe

Last edited by stadry; 06-29-2019 at 08:48 AM.
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