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I want to cement 1/2 cut river rock to cement board or Durock outside as facade around my porch.

I'm concerned about harsh weather contributing to early deterioration. What technique will hold up the best?

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Is the river rock to be used roughened severely on the back that will go to the wall? Is it real river rock or concrete made to look like river rock? –  Jack Apr 8 '14 at 19:56

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