cast iron tub load for upstairs remodel

Hi:
I have a client who wants to put a large cast iron tub in an upstairs remodel. the tub specs require 80lb/sf loading ability. (450lb. tub + 100 gallons water + two well fed folks). My understanding is that most 2nd floors are built to 40 live + 10lb dead load. Any thoughts on appropriateness of this tub?
Thanks
Eric
Replies
What is the span under it and is the tub to be near the wall.
If not a 'real wild party' type group, unlikely there would be any live load outside the tub with 2 "well-feds" in it, and if it's against a wall of a > 12 ft span, the area under the tub is likely good for 80 psf with no other loads.