Laying Tile over Press Board......


Old 03-06-07, 11:15 AM
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Unhappy Laying Tile over Press Board......

So here is my issue... I have been redoing my bathroom at my house, and stupidly I laid Press board down as the Sub-Floor. Now I have learned that Tile cannot be laid over Press Board because of inevitable water damage to the wood. Is there anyway of Sealing or Water-Proofing the press board so that I can lay the tile on it?

If I have to take the press board up I will have to redo all of the plumbing that I have already done for the toilet (which was a real pain).

Please help me if anyone can, I am really trying to avoid removing the press board to lay down Wonder Board.

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Old 03-06-07, 03:11 PM
Join Date: Jan 2006
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When you say press board, I assume you mean particle board. If its particle board, you have a problem. But if you mean OSB, then you are OK. The two are different. One can be used with tile and on cant.

Particle board can't be used anywhere underneath tile. If you do so, your taking a gamble. This stuff swells like all hell when it gets wet, and that expansion will kill the tile installation. Even the moisture from the thinset if you put wonderboard over the particle board will cause it to swell. Taking it up and putting down exterior grade plywood is the best solution.

While a bathroom floor is not necessarily a "wet area", it'll still see plenty of water. And when the particle board gets wet, it will swell and you have cracking tile and grout.

If you are a gambler, you could put 5/8 or thicker plywood over it and then waterproof the entire floor with ditra. You would have to go a little ways up the wall, and seal the joints at the tub, toilet and maybe some other places as well. This might work, but if water ever gets to the particle board that will be the end.

Replacing the particle board with plywood is by far the better choice.
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