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Old 10-26-2010, 11:19 AM   #1
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Thoroseal in basement?


I have an old (1878) brownstone row house on a corner lot (3 walls have dirt next to exterior side, 1 is shared with adjacent house) and am having waterproofing work done in the basement. I'm having floor replaced with vapor barrier, new cement and repointing the walls (foundation walls are large stones, pillar in middle of basement is brick). One contractor recommended applying Thoroseal after repointing, while another said it would trap moisture and cause the mortar to deteriorate. I do not have a serious water problem, but there is some moisture on one wall after heavy rain. Would appreciate recommendations. If you don't recommend Thoroseal for walls, would it be OK to apply to the brick pillar? What about wall shared with next door house. Thank you, Mike

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Old 10-27-2010, 12:18 AM   #2
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Thoroseal in basement?


If there is water getting into a wall, and it sounds like it does get into yours, then let it dry; do not seal the wall on the inside. It is best to go outside and seal the wall there, letting it breathe to the inside; latex paint, if you paint it. As for the shared wall, I don't see any moisture issues if you both have fairly warm, fairly dry walls. Again, I'd use latex paint to let it breathe a tad. Certainly vapor barrier your floor, and "goo" the vb to the walls so you don't have moisture wicking/oozing in from the ground. If the old brick pillar is in contact with the ground, latex paint. It will be wicking water up; let it dry. j

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