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Old 02-16-2010, 07:07 AM   #1
Mr. Bell
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Best way to waterproof particle board?

I have a residential bathroom that has a particle board subfloor. Removing the particle board is not an option. I am using DITRA as a substrate but I have read that particle board is the worst possible subfloor.

What is the best option to waterproof the particle board? I've read that Laticrete 9235 can't be used on particle board either.

Thanks for your help, Mark
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Old 02-16-2010, 07:42 AM   #2
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Hi Mark,

There really is only one option - remove the particle board. Not the news you want to hear but it is the only solution you have if you want a long lasting tile floor.
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Old 02-16-2010, 07:42 AM   #3
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Mark, you literally can't put a tile floor over particle board.
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Old 02-16-2010, 09:19 AM   #4
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Hi Mark,
What is stopping ya from removing that PB?
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Old 02-16-2010, 09:27 AM   #5
Mr. Bell
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What is stopping me from removing the particle board is time and money.

Is it possible to cover the particle board with cement board if I mechanically secure it and cover the screws and joints with fiberglass tape and mortar?
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Old 02-16-2010, 09:30 AM   #6
Shaughnn
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Mark,
The particle board is sitting on top of either a plywood or OSB subfloor. It has to come up. Sorry
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Old 02-16-2010, 09:31 AM   #7
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Quote:
Originally Posted by mr bell
What is stopping me from removing the particle board is time and money.
The time and money will be far less now to replace it than it will to replace the entire tile job once completed.
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Old 02-16-2010, 10:03 AM   #8
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The pb should definitely come out but there aren't any tile police so you can leave it down and take a chance. Only you can decide whether to risk it or not.

Option 1 - Take the PB out.

Option 2 - Snapstone tile can be laid over particle board. No thinset, the tiles snap together.

Option 3 - Make sure the PB is securely fastened and is as flat as possible, sand down any high spots. Get some self-adhesive EasyMat and install on top of the PB. Tile as usual.

Option 4 - As option 3 but use cement board instead of EasyMat. Do not thinset it to the PB. Fasten with backer screws. Lay Ditra on top of the cement board and tile.
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Old 02-16-2010, 10:04 AM   #9
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We care too much around here and know that you can't afford to do this project twice, so we don't want to condone any sort of method for building an expensive tile floor over such an incompatible product.

Methods of building solid, long-lasting tiled floors has been exhaustively tested. Particle board and tiled floors don't get along. If a manufacturer could come up with a viable, long-lasting solution for tiling over inferior substrates like particle board, they'd make tons of cash.

Swap out the PB or choose a different material. Perhaps DuraCeramic?

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