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Sealing a Damp & Humid Basement With Radonseal

Posted by acanthusman (My Page) on
Sat, Sep 17, 11 at 5:30

My basement is ground level in the back, the other 3 sides are completely underground. The house was built in 69, I am going to be putting in a apartment but have damp & humidity problem and am considering Radonseal as a solution prior to renovating. Can anyone speak to its waterproofing claim? I am also curious if this product has an odor to it. I would gladly accept recommendations of other waterproofing products.


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RE: Sealing a Damp & Humid Basement With Radonseal

Radonseal is one of a number of silicate penetrating reactive sealers. In theory, it will work better over the long run than a surface sealer.

But how effective is Radonseal's formula vs. competitors? Radonseal's website doesn't point to any independent testing of its formula in relation to ASTM standards. I have seen posts claiming it is inferior to competitors--but again, no references. (It would be interesting to contact some of the institutional customers the Radonseal cites.)

But if all you have is dampness and humidity, that is normal for a basement during summer months. The only effective way to reduce that humidity--which should be less than 50%--is through mechanical dehumidification. There's no magic one-time wall coating that will remove humidity from the air.

As a builder, I have effectively used Permaquik crystalline waterproofing applied from the outside. It can be used on the inside too, but is best done by pros as it requires a pre-wash of the wall with sulphuric acid.

Here is a link that might be useful: Types of Sealers


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