09:28AM | 07/23/13
My home was waterproofed from the outside in two areas. The back area is fine. The front still has water coming in on a very tiny hole on the concrete foundation. It's about six feet above from the finished basement floor. In the front of my home on the other side are brick steps. The waterproofer advised that the waterproofing is done correctly but that the water has been in there for quite some time and it's still seeping through. May take a while to get through the hole. He suggested we put in a bigger hole to drain all the water and then it will be ok. Is this safe to the foundation? Is this a viable option?


10:18AM | 07/23/13
Drill a 3/8" hole with a masonry drill until you get to where the water is, if it is in a reservoir. It may be that there will be no pocket of water, and there is simply a huge porous sponge of damp, waterlogged concrete. In that case you will likely have to install a dehumidifier to get rid of the water that is maybe evaporating off the inside surface. If the inside surface is painted and the paint is not blistering, there will be little-if-any evaporation and the seepage may continue for months or even years, unless you strip the paint off the inside wall where that leak is, so the wall can dry by evaporation.

Time for more experiments; not enough data to say definitely what's behind that wall or a certain way to deal with it.


10:56AM | 07/23/13
Member Since: 07/23/13
3 lifetime posts
Thanks for the insight on the wall. I will have the waterproofer
drill the hole. It's definitely waterlogged concrete. I have a dehumidifier down there also trying to help the situation. I can't wait years because I want to repair the drywall (which has a big hole) and get things back to normal. So it makes me feel better to know this is common to drill a hole in the concrete. Thanks for your suggestions. If we drill a hole and that doesn't do the job, then will look at why the waterproofing is not working. We went way down under the foundation, so it should be working. It's just been very wet.


11:43AM | 07/23/13
The waterproofing MAY BE working.

You might just have a giant waterlogged concrete sponge, now sealed on the outside so water cannot get in but also can't get out.

You then will need to dry it from the inside. Is the inner surface painted or just bare concrete with (I now find) drywall and perhaps a wood-framed wall with 2 x 4 studs and-all-that?


12:21PM | 07/23/13
Member Since: 07/23/13
3 lifetime posts
I did have drywall. Cut it out to find the little pinhole where the water was coming through. It was going down to the floor, but now that the waterproofing was done, it is less wet. I have water coming through the pinhole still. I have a towel which i change out twice a day. Has water on it, but it's not going to the floor. I want it to dry out so I can replace the drywall.


02:05PM | 07/23/13
Is the inside concrete wall behind the drywall painted or bare concrete?

Did you cut just a little hole in the drywall or did you take it all out?


03:14PM | 07/23/13
Member Since: 07/23/13
3 lifetime posts
It is bare concrete and I cut a hole approx. 4 ft wide x 7 feet high in the drywall.


09:48AM | 07/24/13
Well, that's a fair-size hole, and should provide an adequate surface for evaporation. Put a dehumidifier next to it, aim a fan at it, close all the doors and other ventilation into the room and see how much water the dehumidifier sucks out of the air and thence out of the bare concrete wall. Water collected you can plot daily on a graph and see when it begins to drop off, indicating you are finally getting the concrete sponge completely dry.

This is assuming your hole does not hit a reservoir of water. If no reservoir, or the hole might accidentally have gone all the way thru, you won't need it for drying the Giant Concrete Sponge. Plug it with some concrete mix.
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