Pebble Tile Shower Floor - Some Tips And Tricks I Learned

First really good tip is to lay out the floor of the shower on a piece of plywood or OSB so that you can cut the tiles to fit in that space. That way, you can get all of the tiles cut and ready to lay before you mix any mortar.
The next is to not go heavy when spreading the thinset, since it will easily fill the gaps between the tiles and make it difficult to clean. If using regular sanded grout to grout the tiles, you could use that to set them as well, or possibly a premixed tile glue. If I did it again, I would just put a small dab of polyurethane construction adhesive on the back of each stone to cement it in place, then rely on the grout for the real holding power.
I used epoxy grout and I like using this much better than regular grout. It's super strong, never needs sealing, never discolors and is easy to apply.
For a floor this size (52" x 31") it did take more grout than I expected, so that's something else to look out for.

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