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Tiling over tongue and grove pine walls

I'm preparing to tile over a wall that is 5/8" thick tongue and grove pine. I have a two part question. #1 - can tile be installed over tongue and grove material? There is about a 3/8" wide by 1/8" deep indentation where each of the boards meet that runs the entire joint. #2 - If I can, can I tile directly over the wood wall with tile mastic or do I need a vapor barrier and sheathing for proper adhesion. BTW, this wall is in a bathroom but will not be exposed to moisture. Thanks

Re: Tiling over tongue and grove pine walls

Tiling over tongue & grove material is not recommended because during the winter and summer months, the tongue & grove material will expand and contract with the humidity and the tiles will become loose. However, if you do not want to remove the tongue & grove material and want to tile over it, I suggest you install 1/4" hardy backer board over the tongue & grove material and then tile over the board.

Cyril Prendergast
Kitchen, Bath and Home Remodeler
Serving the Hudson Valley, New York

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