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The directions for Hydraulic Water-Stop say to enlarge the hole or crack that is leaking. How?

April 26, 2017crack directions enlarge hole hydraulic leaking water-stop

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The directions for Hydraulic Water-Stop say to enlarge the hole or crack that is leaking. How?

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Use a hammer and chisel to enlarge the hole. Do not make an open V-shaped hole. Ideally you should undercut the hole, making the exposed part of the hole smaller than the end within the wall. If it is not possible to do that, then at least keep the sides as square as possible.