Bathroom Sub-Floors

We’re planning zero-threshold showers in the conservatory and master bathrooms.

Cutting the hole for the toilet drain.
Cutting the hole for the toilet drain.
The newly cut hole must match exactly.
The newly cut hole must match exactly.

Last weekend Charlie and friend began laying the sub-floors in the new bathrooms that will bring the flooring up to the level of the shower pans.

Charlie used 2" screws into the joists (marked by the pencil lines) and 1-5/8" screws elsewhere.
Charlie used 2″ screws into the joists (marked by the pencil lines) and 1-5/8″ screws elsewhere.

The first layer is paper (to keep the floor from squeaking). On the paper is a piece of 1/2″ CDX plywood  with openings cut to match the plumbing fixtures and wall configurations.

Deck screws need a star-shaped drill bit.
Deck screws need a star-shaped drill bit which often comes in  the box.

The plywood is screwed down every 9 inches (or so) with coated deck screws: 2″ screws into the floor joists and 1-5/8″ screws in the field.

Each layer was separately screwed in to make a very stable base for tile.
Each layer was separately screwed in to make a very stable base for tile.

On top of the first layer of plywood is another sheet of paper and another piece of plywood.

The master bathroom us ready for cement board.
The master bathroom us ready for cement board.

All this gets screwed down in the exact same way. Friend did the cutting and Charlie did the screwing.

The conservatory bathroom needs one more layer of paper/plywood.
The conservatory bathroom needs one more layer of paper/plywood.

That’s as far as we got on Saturday because that’s a lot of screwing which, by the way, is accomplished with a cordless ratchet hammer drill.

The ratchet drill is on the right above.
The ratchet drill is on the right above.

Next task: Lay down Hardiebacker with a layer of thin-set mortar and screws.

Does working on a big project give you a sense of satisfaction? Or frustration?

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Author: Jo

Welcome to The Glade, where the second generation of renovations has just begun and the mania about our home, music and other passions fill our days and nights. We’re Charlie and Jo in the music world; Mary Jo and Charles to family; and JoJo and Charlie to each other. We are renovating a midcentury house in a Victorian historic district where we want to live there the rest of our lives. It's a 1946 house located in Maryland. We were married in this house. Thus far (pre-blog) we refinished cabinets, added a window seat (still working on the cushion), rearranged a wall in the guest house due to sink/vanity replacement, planted a vegetable garden, and other quick and not-so-quick fixes. So this latest zeal for construction is the result of my having lived here since 1997 and feeling a need to ready the house for the next chapter and beyond.

1 thought on “Bathroom Sub-Floors”

  1. wow! so cool to know how to do all that stuff. i guess if you don’t know, you figure it out and then do it! great job! working on a project gives me a lot of frustration and then a lot of satisfaction 🙂

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