4 inches of concrete

apparently in the old days before cement board, construction of a tile floor involved putting planks under the floor joists and pouring in concrete to make a solid base for the tile. this means heavy demo. we've started in this first pic.



here's a close-up. keep in mind the concrete goes all the way down to the planks.



and we're done! easy access to the plumbing we need to move for the new laundry room.



we capped off this day by removing the old wall next to the small bathroom and starting the framing for the new wall.