Newbie to this site. Massachusetts house from 1960s.
Am remodeling bathroom DIY. I ripped out vanity and closet shelves, which exposed the sub-floor. 8 by's wood. Uneven.
I also needed to remove some floor tiles, which had something like cementboard under them, but the thickness of the cementboard is uneven, so maybe it was cement. Tiling looks like it was newer than 1960s, so it probably was more recent. I removed the cementboard that was under the tiles that I removed, so that's down to sub-floor too.
My new vanity fits inside the footprint of the old vanity, but I need to fill in the tile up to the edge of the new vanity. The rest of the exposed sub-floor I plan to put in tiles. I have enough tiles from original floor.
- Is there any code requirement that I use cementboard on a bathroom floor?
- Should I use cementboard under the part I plan to re-tile?
- For the part that is under the vanity, can I just use 1/2 inch plywood and shims to level?
- Do I need to put Base paper (black) on top of the sub-floor before anything else?