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Old 11-09-2011, 09:12 PM   #1
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Type of Thinset over Hydro Ban?


Although Hydroban calls for modified thinset when applying tile, is it really needed? I have a outdoor ledge under a window that I am going to tile and have a ton of let over NON Modified thinset from a flooring job.

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Old 11-09-2011, 09:46 PM   #2
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Type of Thinset over Hydro Ban?


So, you're the type that puts 10W30 in your engine when the manual says 5W20.

Laticrete says modified, so use modified heck it's cheap, $15-20 will buy you a decent one. What type of tiles will you be installing? You might need modified anyway.

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Old 11-09-2011, 09:57 PM   #3
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Type of Thinset over Hydro Ban?


No, im actually the type to use the correct oil but pay for better oil (Amsoil or Royal Purple)..............Part of it is ceramic, the rest is travertine. Its on the back patio. The ledge was made from cedar wood but recently I covered the top with cement board and sealed with some hydroban I had from another job in hopes to heep water out from under the wood as well as prevent cracking in the tile grout.

Just trying to figure out if unmod would even stick or if anyone ever tried.
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Old 11-09-2011, 10:15 PM   #4
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Type of Thinset over Hydro Ban?


Quote:
No, im actually the type to use the correct oil but pay for better oil (Amsoil or Royal Purple)............
OK, great! Then you'll get a premium modified instead of the basic $20 stuff I mentioned.

Quote:
Its on the back patio. The ledge was made from cedar wood but recently I covered the top with cement board and sealed with some hydroban
So it's just a ledge? A small area that you won't mind re doing if it doesn't work out? Actually I believe putting concrete backer over cedar boards is not recommended, you need plywood first. How did you install the concrete board? What did you put under it in other words?

It also matters where this deck is located and the type of exposure it gets.

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Old 11-09-2011, 10:35 PM   #5
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Type of Thinset over Hydro Ban?


yes its a small ledge, about 12 inches wide, 2 in thick , solid cedar board...........

its interesting reading though: for ditra you have to use unmodified when laying down the tile as modified needs the water to evaporate and it would be sandwiched between to non porous surfaces. Kerdi I believe calls for unmodified as well.
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Old 11-09-2011, 11:01 PM   #6
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Type of Thinset over Hydro Ban?


Yes of course. But you didn't use Ditra or kerdi.

What's under the concrete board?

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Old 11-10-2011, 08:43 AM   #7
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Type of Thinset over Hydro Ban?


under the cement board is painted cedar on the top and sides ( from the previous owner)
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Old 11-10-2011, 03:17 PM   #8
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Type of Thinset over Hydro Ban?


So the concrete backer is fastened and there's no thinset mortar between the two? BTW, which concrete backer is it?

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Old 11-10-2011, 03:27 PM   #9
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Type of Thinset over Hydro Ban?


just screws.....Hardiboard
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Old 11-10-2011, 03:33 PM   #10
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Type of Thinset over Hydro Ban?


Just screws is wrong. Plus Hardie is not to be used outdoors.

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Old 11-10-2011, 03:43 PM   #11
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Type of Thinset over Hydro Ban?


You can set tiles on DITRA and KERDI both using modified thinset iffin' y'all want to. Nuthin' wrong it, 'ceptin' it takes longer to dry under some circumstances. That's the way it used to be in the beginning!

The only reason Schluter spec's what they do now is because morons were getting back on fresh tile too soon and weren't allowing a proper drying time.

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