12:21PM | 04/05/04
Member Since: 04/04/04
2 lifetime posts
We live in an 8 year old home,(no prior indications of any water leaks) a week ago, (just when snow was melting) we noticed the carpet was wet by a wall in the basement, we lifted up the carpet and the underlay was wet in a small 2' x 2' area, the walls are finished and we thought there may be a crack or some seepage behind them so we opened up an 8' x 8' wide area where the water was. Once open there was no visual sign of a crack or leak, etc. in the concrete, there is plastic against the cement,(cut at top where the foundation is above ground) then insulation then the final vapour barrier before the gyproc, the moisture we noticed was behind the insulation on the plastic but not on the concrete side (hope this makes sense), this tends to make me believe the water is not from the concrete (outside) side but may be something else, there are no water lines nearby leaking, etc. the only thing we did different in the last while was my wife removed wall paper border in the room directly above this area, we did not use much water to do this, but maybe the moisture came from here, has anyone had a problem like this before,is it possible there is a crack in the foundation somewhere else and the water wicked over the insulation into this area? There was no indication along the bottom of the wall that it ran from a seperate area. I dont want to keep ripping gyproc off and find no leak but it would be nice to have piece of mind.



05:30PM | 04/05/04
Member Since: 01/28/03
694 lifetime posts
What you are describing seems to be an improperly finished basement.

There should be no plastic sheets between the masonry wall and the framed wall and insulation UNLESS it terminates below the concrete slab floor.

There should be no plastic in the form of a a 'vapor barrier' over the studs and insulation and under any drywall toward the living room side.

Perhaps I am misreading but what you describe is a classically 'wrong' basement finish job.

Here is a helpful link:


05:52AM | 04/06/04
Member Since: 04/04/04
2 lifetime posts
Thanks for the reply, you may be reading me correct, the plastic on the concrete side does goes all the way to the top but they cut slats in it from ground level to the top of the wall, there is a plastic vapour barrier behind the gyproc and before the insulation I was assuming this was correct, I did some further investigation last night and I might have found a source of the water coming in, the deck is directly above the place where this water came in, I opened up another part of wall and I can see the lag bolts used to mount the deck header, the tips of these botls are rusty like they have had water on them, is it possible the water is penetrating by these lag bolts if they were not siliconed when they were put in, we did have snow on the deck before this water came in, all your help is appreciated.


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