I'm wondering the best strategy to prepping this for tile. It's 2x9 (actual) joists with 1x8 subfloor and 1/2x2 flooring. The strip flooring is full of gashes and cracks and the whole subfloor has been removed in places for access, as shown.
I’m looking for a voice of experience on whether to remove one or both existing layers or, if I leave them, whether to patch. Every approach has its challenges. I think my preferred approach is:
- Remove the 1/2", leave the 1-by subfloor.
- Repair the opening parallel to the joists (over the 3" pipe) with shims and OSB to the level of the subfloor. Do not repair the openings across the joists, leave them.
- Cover the entire floor with 3/4 inch T&G plywood oriented across the subfloor, parallel to the joists, over the 10 inch openings.
- 1/4 inch Cement board on top of the plywood.
Alternatives I can think of:
- I could NOT remove the 1/2 strips, I want that mainly so the floor doesn't get too high. I could remove EVERYTHING but that seems pointless and I'd have to build the level back up.
- I could fill all the openings but the plywood is meant to sit on 16" OC joists so it can span 10" openings. I would lay it with the strength axis across these openings. If I fill them I'd have to make it perfectly level with the surrounding floor.