[Zeke]

Depends on which way the slope is relative to the drain in the tub. I'd take some measures to re-level the area and more importantly find out why it's out of whack. Any time a bathroom is that bad, you can suspect water damage.

Bets are off it's a 2 story house. I tried to level one of those and it took more equipment than I had. Well, I did get it up a 1/4 inch to place in a new concrete foundation and let it back down, but I had only 3 20 ton hydraulic jacks, some steel plates and some timber. This was for about 20 feet of interior bearing wall.

If I were going for 1 1/2 inches on a 2 story, I'd be calling someone else. Single story wood and I probably could get some of it with an auto floor jack. The 2 story was stucco with a tile roof.

It all makes a difference on how you proceed.