We're going to be converting a very spacious half bath to a full bath, and noticed on hte instructions for the one-piece shower/tub that it said it needed a proper foundation to sit on, but no details as to what that means. I'd been thinking probably some 2X4s arranged as floor joists, with the tub sitting on 3/4 plywood (although, because there's already a drain opening about 3 inches off the floor, I'd put it on 2X6 or 2X8 to get the tub the elevation-easier than cutting a new hole in the 4" waste pipe below floor grade)?
Or is something else what they'd had in mind? If not here, then where would I look for the information?
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