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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 38,252
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For adhesion I would use thin set and back butter the stone. You probably won't get 100% contact but you can mix more TS thin enough to pour like floor leveler and let it run under the FS keeping it low enough to be able to have enough depth for grout.
Use a 1/2" x 1/2" notched trowel.
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