Works underwater in my pool! It's not tile, or any sort of composite material. It's actual slices of river-rock, so I would think it would be as "pool proof" as it gets.
I don't think that it would be any more or less slippery than most other tiles. Definitely more slippery than plaster or pebble, for sure. I would think it would be less slippery than 6" tile, because the grout occurs more often, which would give it a bit more traction maybe?
This would be my only caution. My step markers were set in mortar a few days before the pebble went in. I think maybe the combination of the tiny pebbles, the very thin spaces between some of the rocks and the skill level of the guy working that section of the pool left things a little less than desired. The rocks are not perfectly even with the pebble, they're a bit low, like indented a bit. Which is not that big of a deal for step markers, but you wouldn't want a whole shelf like that, where all the pebble "grout" was raised (or lower). So either you need to keep an eye on that, while it's going it, to make sure the guy does a good job, or have them do grout, and a perfect job of it, so that the overall feel is nice and even.
The grout (or plaster or pebble)
lower would be worse, because unlike most tile that has a slightly rounded edge, the rocks are sliced very square, so their edges are "crisp," almost sharp. Perhaps that's why my guy made them a bit recessed. If they were
above the grout, you'd definitely feel the edges on your skin (feet or backs of thighs or whatever). If you have tile elsewhere in your house, you can get a sense of this. Look for a tile that was cut, one that is smaller than the others. Run your finger across the cut edge and you'll get the idea.
Either way, be sure to have a conversation with the PB
and the tile guy to make your expectations well known about those aspects...
Definitely
not discouraging you from doing this. I think it would look fantastic, and very unique. I have river rock in a few other places in the landscaping around my pool, and while I doubt anybody else notices, I
love the way they compliment each other.
