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After removing old steel shower base, I discovered there is a large hole in the concrete slab around the drain pipe (see photo). The size is 300 x 200 mm, and deep 150 mm (The bottom is filled with sand).
I am going to use ceramic floor tiles in the shower this time (not shower base). A tiler said he could filled the hole with concrete. My concern is that I'm certain there will be cracks in the concrete sooner or later.
I was wondering if I should also use Ceramic Tile Underlay cement board to cover the shower floor, then waterproofing and tiling. Or, are there other options?
