We have our pool stripped down to the gunite. Originally, I was told that the tile inlay on the steps would be done by the plaster sub-contractors, but to my surprise, the tile installers put down what appears to be 1" thick mortar and laid the tiles on top of that. I'm guessing they want the plaster sub to fill the grout lines with plaster.
My main concern is long term and preventing "leakage." Should I have this removed and ask that this inlay be placed directly on plaster? Or is it ok to have the inlays site on mortar and tile/plaster over that?