My current bath is new...2x10's under 3/4 tongue and grove Advantech (better plywood material (main floor). Hardibacker ¼ subfloor prepped for tile.
This tub is heavy!! 300 empty. I was looking to build an island style box. Adding a ½ plywood floor, 2x4 walls, ½ plywood top, then ¼ hardi for tile on top and around side of the tub. IS THAT OVERKILL?
Reading kohler recommends splitting the framing/surround due to its weight.
My thoughts building a box, having the 4 feet rest on the ½ plywood, then setting on the ¾ main floor would be better then it just resting on the Advantech. I also though having a island style I could remove the grout lines and pull the box out if needed then trying to remove sides of the wall of the tub.
The location is in the corner, so I would be building a knee wall in the front and on 1 side if I didn’t do the island….