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drewdin 06-03-2013 08:02 PM

Condensation on foundation walls
Hi Guys,

It rained like crazy here yesterday, I went to check the basement and sure enough there is water in a few spots.

The weird thing is that the water is not coming in from a crack or seeping through the floor, I can see the beads of water forming on the walls and drooling down to the floor.

I have never seen this before, its only in 4 spots. The spots are about 1-2 feet off the floor.

There isnt a ton of water but there is abot a 2-3 foot radius on the floor where its moist.

What can I do to fix this? Thanks

nealtw 06-03-2013 08:07 PM

Perimeter drain and wall waterproofing of the exterior wall have failed?

drewdin 06-03-2013 08:33 PM

Hi Nealtw, i havent tried anything. do I just dig down and use a waterproof type paint or sealer? Thanks

nealtw 06-03-2013 09:02 PM

I would think digging to find the water table first, checking the perimeter drain and see what the problem is there first. If the drains are free and running the problem might be clay type soil not letting water to get there. Depending on what foundation is, all concrete walls have steel of one type or another that held the forms together, if they weren't sealed properly, sooner or later they rust out and leak. All the sealing in the world won't keep water out, the basement isn't like a swimming pool, so you need to get rid of the water too.

WindowsonWashington 06-04-2013 05:50 AM

What is the indoor humidity level?

Temp on the outside and of the basement wall?

drewdin 06-04-2013 10:12 AM

the house is from 1927 so I have a fieldstone foundation. I have to say the wet spots are about ~5 feet deep to the top soil so there would be a ton of digging. It was humid outside but the basement was rather cool.

nealtw 06-04-2013 10:23 AM

Could be condensation but ususaly dosn't show up in a locallized zone, were the cold water pipes dripping with water.

GBR 06-04-2013 04:13 PM

Do you have CMU's for the walls that the bottom rows are filled cells with water, condensing through to inside, where are you?

PS. answer #5 first... thanks!

mudmixer 06-04-2013 04:34 PM


The foundation walls are field stone (built 1927), so you can expect variable results depending on the local wall and exterior conditions in addition to conditions interior air conditions.

Condensing comes from warm moist air on a cold surface.


drewdin 06-04-2013 07:07 PM

it was literally dripping down the walls in a few spots. Whats a CMU?

The main poop pipe is half pvc and half cast iron. Its in one corner of the room where the dripping is, the cast iron pipe is condensing.

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