waterproofing paint for block foundation?

Old 07-29-20, 11:57 PM
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waterproofing paint for block foundation?

Does waterproofing paint work for block foundation? There is mold between my block foundation and drywall, I think they are caused by condensation as I have never experienced flood or even any measurable volume of water.

Anyways I'm planning to demolish the whole basement and leave it as unfinished bare block foundation wall, and apply some kind of waterproofing sealer on the interior side. But does applying on the interior side work when the exterior side is already moist from the moisture in the soil?

I have looked at reviews of waterproofing paint products at home depot and surprisingly a high percentage of people say they work on basement foundation wall. Should I trust the review and do you personally think applying waterproofing paint on the interior side can prevent seepage?
Old 07-30-20, 03:51 AM
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I have have tried it on about half a dozen rental houses and have never seen waterproofing paint work for more than a couple years. It worked for a couple years but in every case it started to leak and eventually it peeled off in small flakes.

Basement water problems are best dealt with outside. Keeping water from entering the perimeter of the home should be your goal. Follow the usual tips like make sure the ground is graded so surface water runs away from the home. The house should have working gutters and downspouts that direct water well away from the home.
Old 07-30-20, 04:04 AM
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I agree. While I've applied quite a bit of Drylok over the years for builders it's not a cure all. If the moisture coming thru the foundation isn't too bad it will work for a few yrs. It is my masonry primer of choice when painting dry below grade block foundation walls.
Old 07-31-20, 06:19 PM
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As stated, best process is to keep water away from the foundation in the first place with gutters, downspout extensions and grading.

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