Water leak in basement, don't know where it's coming from

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Old 10-16-09, 04:52 PM
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Water leak in basement, don't know where it's coming from

We've recently had a sewage flood in our basement due to roots from front yard tree clogging up the pipe.

Got that snaked out and did the root killer, cleaned up everything, carpets.

But, now there is a small leak in one bedroom corner. This room is right next door to the bathroom downstairs where the drain pipe is, but all of that is dry.

So, the leak is either coming from a crack in the wall or underneath the baseboard (there's a good gap there between the baseboard and cement floor).

I took picture of it, so that maybe someone can see what/where the leak is coming from?



This where the water leak is coming in. I pulled back the carpet and padding.




Any suggestions?

Thank you!
 
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Old 10-16-09, 06:20 PM
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Looks like an external infiltration. Are your walls poured monolith or block? Is there downspouts outside the area of the leak that aren't draining at least 8' from the foundation? How well drained is your lot in that area? How are these walls finished? Are they floating?
 
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Old 10-16-09, 08:38 PM
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It may be just left over moisture from the back up that you had. But it could also be a leaking roof jack where the vent goes through the roof. Is the plbg. vent any place in that vicinity??
 
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Old 10-17-09, 03:02 PM
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Originally Posted by chandler View Post
Looks like an external infiltration. Are your walls poured monolith or block? Is there downspouts outside the area of the leak that aren't draining at least 8' from the foundation? How well drained is your lot in that area? How are these walls finished? Are they floating?
they're poured monolith.

There's no downspouts outside in that area

the floor is a floating slab.
 
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Old 10-17-09, 03:09 PM
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Originally Posted by lefty View Post
It may be just left over moisture from the back up that you had. But it could also be a leaking roof jack where the vent goes through the roof. Is the plbg. vent any place in that vicinity??

Yeah, there probably is a plumbing vent close by because the room directly next to that wall is the bathroom and all 3 toilets in the house empty into that one.
 
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Old 11-26-09, 04:29 PM
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It did it again because we just had another major flood downstairs.

The water leaks just a little bit in that one corner of the room in the basement.

Is it water left over from the flood---that happened a week or so ago--got it all cleaned up...?

There are no water stains coming down from the ceiling. It all looks like it comes from the bottom corner where the baseboard is. The slab is not plus with the siding....it dips down a bit.

There is not alot of water coming out from there, but there is some.

Should we tear out that wall and see what's behind it?

Thank you!
 
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Old 11-26-09, 06:55 PM
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If the water is consistent to that area, yes, I would remove the sheetrock and molding to see what is behind it and how extensive the water goes up the wall, if at all. You mentioned no downspouts in that area, I am assuming you do have gutters, though to take the water away from the foundation.
 
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Old 11-28-09, 06:15 PM
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RMCHomeowner,

That's not a plumbing leak -- that's ground water!

There's no plumbing in that corner. Correct me if I'm wrong, but your basement slab is below grade.

The BEST way to seal the wall is from the outside. But that's a summertime project, when things are dry. A wide enough trench around the wall that you can work in and below the level of the slab. Install 15 or 20 mil membrane on the wall and a french drain at the bottom of the trench, and a drainage system to give the water a place to go.

To get you through the winter, strip off the sheetrock and coat the inside of the wall with roof mastic -- like Henry's #208 or Black Jack. That will stop the water from coming in for now, but it is NOT a permanent solution.
 
 

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