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Sand/Cement Thickness Thanks for the reply Jim. What could my min. thicknessess need to be on the two layers of sand/cement?

I am building a sauna in my basement where currently the concrete floor has a drain but is not sloped (was set up for a tube). My plan was to roughen up the concrete, build angled screeding jigs (slope to drain 1.5%) and fill the floor space with concrete, mag trowel and call it good. Once dry...