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The waterproofing material's spec sheet will tell you how wide of cracks it's designed to accommodate. That should be your guide. If your joints are wider than that, move to a caulk. If they're extremely wide (over 3/8" or so), consider a rope caulk or a masonry patch product as support for the sealer product.


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Generally speaking when stone walls are falling apart there are two main reasons: (1) The structure has an unsound design. This is typically the case for badly designed retaining walls which have not been backed into the hill far enough. (2) The stone is ill-fitted. In your case reason #2 is probably the problem. You cannot just heap two unmatched stones ...


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Get the occupant upstairs to install a proper shower tray and pipe the water out from the shower drain straight through the pipes and out of the building. Concrete will always absorb then release water eventually but the shower tray and piping system (Without leaks)is waterproof. This is the cheapest and permanent solution.


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its butyl sealant. it still works fine, but nowadays you can use a polyurethane sealant for superior results.



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