The folks at Lowe's told me not to place tile on top of tile, but it seems like the shower in the home I just bought has 2 layers of tiles. Is there a code for that? Or just a "suggestion" not to have 2 layers of tile?
Shower – building code for shower tile? (CA)
bathroomcode-compliancerenovationshowertile
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Best Answer
There is no code requirement/ restriction for installing tile over tile... for showers or otherwise.
However, there are many trade organizations in the construction industry that investigate, test, etc. products (i.e.: roofing, concrete, tile, paint, etc.) so that various materials are installed in the proper (most durable long-lasting) manner.
For tile, we follow the Tile Council of North America (TCNA). They recommend various methods of installation for countertops, showers, retrofits, etc.
Check here: http://www.tcnatile.com/
I’d also verify recommended method of installation by the tile company of the actual tile you select.
I’m guessing they’d recommend you remove the old tile for lots of reasons, (i.e.: loose tile, bad grout, mold, lack of adhesion, incompatible tile, etc., but check out their recommendation.