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Unread 09-30-2019, 06:25 PM   #11
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Join Date: Sep 2019
Posts: 29
Thanks for the idea HooKoo! I actually think that would be an elegant solution. Problem is, I already installed a rather thick 1-3/4" pre-slope mud bed, so this would entail demoing or redoing the preslope after laying the pipe. Basically, I kind of missed my window, and I'm willing to live with that.

In the meantime, I'm going back over my CBU with a 4' and 2' level to check for flatness. I have some areas with 1/4-3/8 indents over a 4' span. Should I take the CBU sheets down in these areas and shim out the studs, or float those areas with thin/medium set, red guard, and call it good?

It's hard to get a photo, and this is exaggerated a bit by the tapered edge, but for reference:
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