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Unread 02-04-2020, 12:09 PM   #1
eparpart
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Pre mixed vs bagged

New to the forum...be easy on me.

Can I use pre mixed thinset to bed my backer board on floors? I've always "over screwed"...but as the building trades instructor, I'm looking to save a little time and mess in a remodel with a dozen kids. Both floors are short-span, on foundation walls. thanks, Erich
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Unread 02-04-2020, 12:45 PM   #2
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No.
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Unread 02-04-2020, 12:55 PM   #3
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Welcome, Erich.

Best thing you can teach those kids is to read and follow the product manufacturer's installation instructions and the general requirements of the tile industry when installing ceramic tile. As for the mess, I assure you that personally I can make a good deal more mess using organic adhesives than with thinset mortar, which is why I avoid it like the plague.

While there are CBU manufacturers who permit the use of organic adhesives (mastic, pre-mixed, etc.) to bed their product, I'd not recommend it. What you're doing with the mortar under the CBU is providing a 100 percent footprint and unless your subfloor is really flat you're unlikely to do that effectively with an organic adhesive.

Not sure what "short span" might mean to you, but I'd also recommend you teach them to evaluate the joist structure and subflooring before proceeding with a ceramic or stone tile installation. You can enter your information into our Deflectometer in the dark blue bar near the top of the page to get an initial go/no-go reading on the joists.

The subfloor we'd need to discuss further.

My opinion; worth price charged.
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Unread 02-04-2020, 09:41 PM   #4
eparpart
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Enough said, no pre-mix. First year as the building trades Instructor... the tiling is a little added bonus, so want to make sure I'm getting it right.
Now that I've found this forum, I REALLY wish I had some pics to share of the disaster we ripped out! Thanks for the replies!

Erich
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Unread 02-05-2020, 08:13 AM   #5
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get your hands on a TCNA (Tile Council of North America Handbook) if you plan on instructing people in the right way to do things.. Better yet, message me your address and Ill send you one!
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Unread 02-05-2020, 08:49 AM   #6
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Originally Posted by e3
...message me your address and Ill send you one!
That, Erich, is a hellof an offer and one of which you should surely take advantage.
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