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How wide are the channels? Mortar is ok for smaller areas less than 3/4" any bigger than this I would want to use fine aggregate cement (not just sand as in Mortar).


I have been a practicing stone mason for fourty years and I have seen the long term affect of the 1:3 mix compared to the 1:2 mix. With proper preparation from the base under the footing and throughout the build, I recommend the 1:2 mix particularly with flagstone and surfaces that are going to experience a lot of weather. My experience is almost ...

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