Main Floor Bathroom Tile
Applied Kerdi membrane to both the shower and bathroom floor, and then proceeded to tile. The Kerdi on the floor is both to add some waterproofing and also to reinforce the tile. These old floors flex a bit, so the Kerdi/mortar layer will help stop joint cracking.
Lots of work to put together these tiled showers! Now we're ready to get glass doors on both the attic and main showers; no more shower curtain.