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RE: Shower Floor/Drain Layout? (Follow-Up #6)

posted by: mongoct on 11.16.2014 at 10:56 am in Bathrooms Forum

Aletia, let me post an alternative.

In large showers, it's best to keep things as simple as possible. It can help minimize mistakes.

In large curbless, I've done a couple designs like the following; both in residential and in commercial.

It allows you to have your 1/4" slope per foot.

It allows you to keep a single plane of tile on the floor instead of having the breaks you have.

It eliminates the too steep 1" per foot drop you have under your bench.

And, it can save you the cost of a linear drain.

I would only do a shower like yours using a topical membrane. A trowel-on along the lines of Hydroban, Aqua Defence, or RedGard, OR a sheet membrane like Kerdi.

Anyhow, the shower has a single plane, sloped at 1/4" per foot, that leads to a trench at the wall. The two sides of the trench floor itself are sloped to the drain.

I don't recall the exact dimensions of your shower, but for simplicity of math I'm going to say it's 6' wide and 5' deep. And I am going to simplify this:

Your main shower floor will slope down 1/4" per foot along that 5' depth, from the entry of the shower to the trench at the back wall, for a total drop of 1-1/4". Your trench along the back wall is 6' long from left-to-right, with the drain centered in the middle. Essentially breaking the trench into two 3' long sloped sections. If each 3' run is also sloped 1/4" per foot, that gives an additional 3/4" of drop to the drain.

Your 1-1/4" drop from the main slope, plus the 3/4" drop within the sloped trench? Add them up and you get your 2" required elevation between the curb and the drain.

I'd shape the sloped floor and the trench in deck mud, then cover it with one of the aforementioned membranes like Hydroban, etc.

With the membrane being on top of the sloped mud, that also satisfies the code requirement that your membrane be sloped to the drain. Hopefully your contractor is aware of that code requirement.

The drain needs to be compatible with the membrane.

If you did this design, the "open trench" can be left open, as it'll be covered by the bench. Or you can cover the trench with a grate of some sort. I've done typical looking metal grates as well as tile-on grates to cover the trench.

Good luck!


clipped on: 11.16.2014 at 10:43 pm    last updated on: 11.16.2014 at 10:43 pm