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Wednesday, January 25, 2023

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HomeTechnicalAsk the ExpertsMosaic tile on a shower curb

Mosaic tile on a shower curb

QUESTION

Would this mosaic be advised over a curb? It will be installed on shower floor, up over curb to the bathroom floor. It is 3/16″ thick. Glass doors will be installed on top of it.

ANSWER

Is that a foam curb? If so, consult the manufacturer of the foam material to determine the minimum size of tile that can be set on/supported by that material in a horizontal, weight-bearing application.

As far as the tile’s ability to support weight/load, I see no problem with that as long as you have a very sound substrate and full bond coat support of the tile. I have personally installed similar tile in bathrooms where extremely heavy cast iron claw foot tubs were set on top of this tile after I installed it.

A shower has an environmental exposure classification of 3, which is described as “frequently soaked or saturated.” This affects the methods and materials you use for this installation. The manufacturer of the tile can tell you if the tile is suitable for use in a shower. It’s hard to be certain from a picture but it appears to be a ceramic tile that most manufacturers would allow in a shower installation. 

Was your question about laying out the tile on a curb? If so you should research a couple options for finishing the curb corners. Some mosaic manufacturers make a trim piece that can be used on the corners of the curb. Designers sometimes use accent pieces or metal end tops for the curb corners as well.

NTCA Technical Team

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