Excessive Moisture Concrete Slab Sealing
florida_wen
17 years ago
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floorguy
17 years agoRelated Discussions
Stained concrete floors..do they wick moisture?
Comments (17)Exterior masonry of any kind should not continue from outside into the enclosed inside portion of the house; there should be a break containing flashing and/or waterproofing. If such a barrier has been omitted, it will most likely have to be installed. Sealant or caulking is only a temporary repair at best. There is no way to know how to solve your specific problem without seeing a detail of the indoor/outdoor condition. If there is water in contact with solid masonry or a crack it will move through it by gravity, hydrostatic pressure, or capillary action (wicking) but in a properly constructed slab, a layer of coarse gravel or crushed stone (not fine materials like sand or clay) prevents water from being wicked up to the bottom of the slab (unless there is hydrostatic pressure present). Water vapor moves through a material if the air above the slab is drier. In a properly designed slab a sheet vapor retarder is sufficient to prevent water vapor from passing through the slab. In the case of hydrostatic pressure a waterproofing layer is required below the slab. None of this is difficult; it's standard concrete construction practice in commercial construction but it appears to be often ignored by home builders....See MoreSealing Slab to prevent carpet moisture
Comments (1)Like you said, perimeter. Now you no longer have water overcoming the top of the slab and coming under the bottom plates of the framing, you should be OK. You can seal concrete moisture vapors, but you will have to coat the entire area, not just along the perimeter, if you do have high moisture vapors emitting. Perimeter, sounds very localized, that a moisture blocker will not do any good, but lighten your wallet....See MoreTrenched slab, now seal?
Comments (2)Thanks for the reply, Greendesigns. I'm quite worried about the filling of the trench, it isn't smooth and even. When a slab is trenched, what procedures should be followed to make it "whole" again? Is anything necessary for the places where the floor won't show because it is covered by cabinets? My worry is that if there are low, uneven places under cabinets, and there is a water leak or spill, it will collect and/or run under adjacent flooring....See MoreMoisture barrier concrete slab garage conversion needed? alternatives?
Comments (2)I'm not sure who is advising this but it would seem odd. As long as you don't have any visible water problems now, then a vapor barrier over the existing concrete (I just use 4mil plastic) will be fine. You may wish to put down wood sleepers (always PT even with the plastic) and some rigid insulation between below the subfloor....See Moreflorida_wen
17 years agograffster
17 years agoflorida_wen
17 years agohappyfeet2
17 years ago
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