Putting in a bathtub for my daughter, house is 60 years old at least. Floor from wall is out of level by about 3/4" in the 5 foot area where the tub will sit. How should I level the floor and what would you use. If I had the time and money I'd like to see the center beam jacked up but i don't. House is a old balloon framed house, one story with full basement with a very low ceiling. Wish I had my camera with me. Any and all help is welcomed.