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Unread 07-15-2013, 07:06 PM   #1
Ryan7
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Tile over plywood countertop

I'm tiling a kitchen counter with porcelain 12x24 tiles. I happen to have a bucket of hydroban I'd like to use up before it goes bad.

Here's the question:
Is 2 layers of plywood and 2 coats of hydroban an acceptable subsurface or do i need CBU?
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Unread 07-15-2013, 09:41 PM   #2
Deckert
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I'd install CBU (or a mortar bed) over the plywood, then hydroban over the CBU.
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Unread 07-15-2013, 11:56 PM   #3
Ryan7
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Thanks for the reply Deckert,

I would think that the Hydroban will provide a nice isolation membrane. Which is the only real reason I can think to use CBU in this situation. So why both?
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Unread 07-16-2013, 04:46 AM   #4
BlueRidge Contracting
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If I understand correctly you want the cbu over the plywood and then hyrdro ban over the cbu. You don't put the hydro ban directly over the plywood.
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Unread 07-16-2013, 09:44 AM   #5
jwmezzanotte
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Ryan

Not technically acceptable I suppose, but I have done several counters in the past over two layers of plywood alone. Several years later, all of them are fine. I'm sure you will be ok, just make sure you get a good bond and good modified thinset.
Now I use greenskin over top of the ply.
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Unread 07-16-2013, 07:18 PM   #6
Ryan7
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Maybe I'm under-thinking this I'm certainly not interested in 'getting away' with a lesser application but I just can't think of a reason/benefit to add CBU here.

I'm happy to be proven wrong and it's the way I've always done it in the past.
But it just seems like a bit of a waste in this situation.
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Unread 07-16-2013, 07:22 PM   #7
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Use greenskin at least for some measure of water protection. When the plywood gets wet it puffs up, taking the tile with it.
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Unread 07-17-2013, 12:02 AM   #8
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Hydroban is a full-on waterproofing/crack isolation membrane.
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