I am in the slow process of remodeling a small bathroom. The room is roughly 50 square feet. I am down to the bare joists and have 3/4" plywood that I'm about to screw down with 3" screws. After that, I plan to install half inch cement board followed by 1" porcelain hexagon tiles. The house is about 100 years old and due to settling the floor has a very slight yet continuous dip that goes downward toward the outside wall. What I mean by continuous is that if I lay a 6ft level perpendicular to the joists they are all in contact with the level.From one end to the other (a span of eight feet) I think it's roughly an inch in difference. It's by no means significant.
Since the lack of perfect leveling isn't substantial and since I I will be installing a new toilet and pedestal sink and will reposition the original ball and claw tub (which by itself weighs several hundred pounds) I was wondering if pouring a thin layer of leveling compound over the cement board would be the most ideal fix to my unleveled floor issue. Obviously I'm not an expert in the area but I thought since the problem is somewhat minor that using a leveling compound would be the most practical solution.
I'd especially like the toilet to sit as perfectly level as possible so I am hoping to correct this minor flaw in the floor.