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Old 09-08-2017, 03:17 PM   #1
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bathroom tile question and cement board

hi hope everyone is having fun keeping busy always figuring out another way to do something.

i am wondering if it is possible to tile my second bathroom. I got the first one out of the way. It is 3/4 ply over 2x10 16' on center with 1.5" lightweight concrete.

I realized I may not be able to tile this bathroom because there is a slight height difference in one of the cracks. picture attached shows where the difference is.

when I took the old vinyl floor out the builders used a 2x12 around the toilet flange. it was all cracked and warped so I replaced with a second layer of 3/4" ply and durock cbu with thinset. the other bath I used 2 extra layers of 3/4" instead of the cbu on top.

its a 5x6 bathroom with tub. so its a small span and when I jump around a bit I dont feel the crack move. what are my chances if I fill the uneven parts with slc and tile with redgard or equivalent? or should I skip the tile alltogether?
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Old 09-08-2017, 04:47 PM   #2
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Usually, if one side of the crack is higher than the other side, tile is not recommended. If I had to guess, the plywood under the SLC got wet and swelled, causing the SLC to crack. How long is that crack?

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Old 09-08-2017, 10:13 PM   #3
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It goes all the way to the corner of the room. looks like removing the lightweight concrete while doing a tub removal would be appropriate. so Ill just go with the vinyl tile which is pretty durable a lot better than laminate IMO
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Old 09-08-2017, 11:16 PM   #4
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Hi, Colby.

Purely as comedy, all the pros who see your egg-beater mixer are cringing at the build-up and are screaming for you to clean it off.
Tonto Goldstein….. but my friends call me Bubba
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