08-01-2009, 05:43 AM
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Member
Join Date: May 2008
Posts: 88
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just a wag but i'll bet there are insufficient control/contraction jnts in the conc,,, chase w/3/8" diamond tuckpoint blade on 4" grinder to 3/4" depth, install 1/2" closed-cell backer rod, & seal w/100% silicone caulk,,, 'tool' the silicone to maximize sidewall adhesion & leave sealant 1/4" below d/w surface,,, as always, CLEANLINESS is required for longevity epoxies won't usually work unless you provide full-depth jnts at this stage of the d/w's life.
you can also use sika which comes in various colors.
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