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    Re: Concrete block koi pond

    2 posts, 0 answered
    1. koichick54 avatar

      koichick54
      I have read on koi websites that Xypex can be used safely on concrete block koi ponds. I have seen both direct application technique used, as well as an admixture for an interior "stucco" coating. Would either be as successful? I would prefer not to have a stucco coating that could be prone to chipping.
      Posted on 30 Mar 2014
    2. Jim Caruth avatar

      Jim Caruth


      The Xypex treatment that will be successful in waterproofing of CMU (concrete block) depends largely on the quality of the CMU.  In some regions of the world the CMU is very “tight” where as in other regions it is really very porous.  It is my best understanding that the relative tightness of the block has mostly to do with the nature of the sand in the region in which the block is being made.

      The outcome of this is that in some areas where the CMU is quite tight, CMU water holding structures are waterproofed easily with a two coat applications of Xypex Concentrate followed by Xypex Modified or just 2 coats of Xypex Concentrate.  However, in areas with less dense CMU a two coat system of Xypex Concentrate followed by Xypex Megamix I is required.

      Certainly Xypex can and is used for waterproofing of block based Koi ponds.  I would recommend contacting your local Xypex dealer or local Xypex Technical Representative (this
      information can be found on the Xypex web site) and ask their advice on how best
      to proceed.

      Posted on 31 Mar 2014

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