Subfloor for the Bathroom Tile

Last Saturday I had 2 goals to complete: paint the master suite ceilings and figure out how much lumber we would need for the bathroom subfloors.

The pink ceilings are finished.
The pink ceilings are finished.

The ceilings are painted.

Before the floors are tiled the floor outside the shower must be level with the floor inside.
Before the floors are tiled the floor outside the shower must be level with the floor inside.

Then I measured the exposed floor areas in the two bathrooms.  When the tile is applied the shower pans it will continue into the rooms with no barrier between the shower and the bathroom floor.

The master bathroom needs two times 2 sheets of plywood to cover the entire floor.
The master bathroom needs two times 2 sheets of plywood to cover the entire floor.
The conservatory bathroom needs half the amount of plywood of the master bath -- 2 sheets total.
The conservatory bathroom needs half the amount of plywood of the master bath — 2 sheets total.

Keeping the above dimension in mind we’ll need six 4′ by 8′ pieces of 1/2 inch plywood for the sub floor to create one-inch thick flooring. (Apparently plywood does not come in inch thick pieces. Half-inch will also be easier to maneuver.)

4' by 8' sheets would be easier to lay than the 3' by 5' sheets of cement backerboard.
4′ by 8′ sheets would be easier to lay than the 3′ by 5′ sheets of cement backerboard.

Cement backerboard however generally comes in 3′ by 5′ pieces (even though ProBuild delivered 4′ by 8′ sheets to us). I think we can buy 6 sheets and piece with the extra we have left from putting cement board in the showers.

The master bathroom floor must be laid around the kneewall which might ultimately change the dimensions or layout configuration.
The master bathroom floor must be laid around the kneewall which might ultimately change the dimensions or layout configuration.

The process is to lay two layers of 1/2″ plywood, 1 layer of cement backerboard, apply one layer of KERI waterproofing membrane, then tile.

Do you fret over economical layouts and plans?

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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.

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