Monday, February 21, 2011

Waterproofing a basement

Chris in NY


I have cement floors and block walls in my basement. What do you suggest I use to waterproof it?

I’ve found that using the word “waterproof” in conjunction with “basement” is almost an oxymoron. If the outer walls of the basement were not properly sealed during construction, excess moisture is pretty much inevitable. However, there are some pretty good sealers on the market. One that I came across recently that has some very impressive reviews is from Sealmark Coatings out of Donora, PA. They specialize in coatings to protect against water intrusion. But this is a 50/50 endeavor. What I mean is, 50% is in the quality of the product and the other 50% is in making sure you apply it correctly. This, in itself, can be a challenge since a lot of the waterproof coatings can be like spreading pancake batter. Just make sure you read the instructions carefully. There are a lot of elastomeric products that are decent, although my experience has been that you’ll have to re-apply coatings over time. The newer rubber/acrylic compounds have better lasting quality.

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