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Old 05-20-2018, 04:35 PM   #1
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Cementboard shimming over bathtub flange?


Finally getting around to doing our guest bathroom interior. I noticed that some guides online install shims on the studs after installing the tub, so that the cement board extends beyond (or onto) the bathtub flange. Is this correct to do? Or should there be no shims, just flush on the studs with a gap between the flange lip and the cement board?

I saw this example online to show the shims in place: http://www.scottherndonhomes.com/Blo.../tileprep1.jpg
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Old 05-20-2018, 05:27 PM   #2
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Re: Cementboard shimming over bathtub flange?


You should stop your cbu at the top of the flange. Your tile will jump that small gap and will prevent water wicking.
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Old 05-20-2018, 06:28 PM   #3
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Re: Cementboard shimming over bathtub flange?


Depends, some flanges are 1" tall.
In that case I use lattice as a shim on the whole wall so there is no curve to deal with.
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Old 05-20-2018, 07:20 PM   #4
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Re: Cementboard shimming over bathtub flange?


Shimming the three walls may prove to be a PITA, and still leave you with a transition at the tub edges leading to your sheetrock. The gap, whether it is 1" or less will only be 1/4" deep, and you can thinset the gap if you want to. I don't as 12" tile won't skip a beat jumping it and still adhering properly.
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Old 05-20-2018, 08:10 PM   #5
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Re: Cementboard shimming over bathtub flange?


Use drywall and kerdi membrane, leave gap as Chandler suggests.
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