I'm not sure what kind of underlayment you have to put the stones on but I strongly suggest something like Durock cement board. That's what I framed my fireplace with and then applied the mortar directly to the cement board... no need for wire mesh. In my experience, wire mesh is a lot more work that it's worth and sometimes interferes with the material being applied to the underlayment. The stones that you're using may be different than what I used so be sure to get all the information you can from the manufacturer about how to apply the stones. Have fun with your project.
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