What is the best way to build a tile shower bench that is shaped like a rectangle with one end that is open, I don't know of the best way to waterproof the bench with the cement board and shower pan liner below
Thank You
:)


Another question is what is the best way to build out an area behind tile that is thinner than others like for a accent band in a shower
Thank You
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As long as the framing can support the weight, you can build one out of blocks and mortar. Another option would be a preformed tile ready lightweight bench such as one from Noble company. Sheet Membranes & Shower Installation Products for Tile & Stone

For the tile build out, what kind of "thinner tile" and what's the thickness difference?