Tile the floor area under the tank coming out a little around for aesthetics. You could also put in a vent fan to the outside behind the tank to help ventilate. Or a dehumidifier hooked to a drain.

I've always been told by structural engineers that you use the sq/ft load of a refrigerator for a comparison to your tank/hottub. If your fridge isn't sagging your floor neither will the tank if it's the same or less per sq/ft load.


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