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Old 04-22-2012, 04:19 PM   #1
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cementboard-bathtub joint question with picture


When joining the bathtub with cementboard, does the cementboard need to lap this perpendicular lip of the tub (see attached) or just butt it above?

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Old 04-22-2012, 05:13 PM   #2
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cementboard-bathtub joint question with picture


The cement board does not have to overlap the lip on the tub. It should sit directly on top of the lip. After the cement board is fastened to the studs, your wall tile should overlap the lip, and once your ready to grout, it's better to get a bead of waterproof caulk along the bottom edge of the bottom tile all the way around. There is a special "grout caulk" you can buy for this at just about any home improvement store.

http://richeyconstructioncincy.com

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Old 04-22-2012, 05:32 PM   #3
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cementboard-bathtub joint question with picture


awesome! thanks
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Old 04-22-2012, 08:31 PM   #4
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cementboard-bathtub joint question with picture


Woah.. you nailed your tub directly to the stud? I thought you were supposed to nail just above the rim.
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Old 04-22-2012, 08:49 PM   #5
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cementboard-bathtub joint question with picture


Some guys will shim the studs and let the backer board land halfway down the inside of the flange.

The guys at John Bridge can point out the options.

http://www.johnbridge.com/vbulletin/index.php


For what it is worth, the Kohler tub I installed showed the backer to overlap the inside of the flange.
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Old 04-22-2012, 10:33 PM   #6
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cementboard-bathtub joint question with picture


Quote:
Originally Posted by DIYGuy2012 View Post
Woah.. you nailed your tub directly to the stud? I thought you were supposed to nail just above the rim.
i drilled holes in the tub and nailed through. why, does it matter?
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Old 04-23-2012, 07:45 PM   #7
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cementboard-bathtub joint question with picture


Some mfgs say to use a nail with a large head, like a roofing nail, and to nail it into the stud just above where the flange ends. So the nail head captures the flange against the stud, but it isn't through the flange.


What model and mfg is the tub? They will probably have instructions online.
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Old 04-23-2012, 08:05 PM   #8
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cementboard-bathtub joint question with picture


I am no pro by a long shot but I would think that nailing through the tub doesnt allow for expansion and contraction without moving the stud that it is attached to slightly. That might cause your grout to crack. I'd be interested in what others thought. Maybe ask a pro?

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