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Unread 02-26-2020, 09:31 AM   #1
VikingLike
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Tile above the bath tub..

I’m helping my daughter in a couple of weeks with her bathroom remodel.
We’re planning to tile above her bathtub.
It appears that currently she has Sheetrock with tile on it.
What is the best way to go as a replacement?
Sheetrock, Sheetrock and membrane or Hardibacker?
Thanks for your opinion!!!
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Unread 02-26-2020, 09:36 AM   #2
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Welcome back Scott.

This tub has a shower in it?
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Unread 02-26-2020, 09:49 AM   #3
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Yes.
Sorry.
Shower above tub.
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Unread 02-26-2020, 10:14 AM   #4
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If you want to use drywall, your options for waterproofing are limited to those membranes (only two to my knowledge) that have gotten code waivers for such backing material in wet areas.

I would recommend you use a CBU - a real C-1325 CBU - which would not include Hardiebacker. The Hardiebacker is a Fiber/Cement board and is thinner than your adjacent drywall. A CBU such as Durock would match the adjacent drywall thickness and is also less absorptive than the Hardiebacker allowing for easier application of a waterproofing membrane.

You could also, if you prefer, just install a polyethylene sheet over the stud wall before installing your wallboard. The poly would need to lap over the tub's tiling flange on the drain side.

My opinion; worth price charged.
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Unread 02-26-2020, 11:54 AM   #5
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Great. Thanks!
So I’m thinking Durarock 1/2” over a 6-mill poly sheet?
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Unread 02-26-2020, 11:58 AM   #6
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Can't tell what you're thinking from over here, Scott.

That would be Durock if we're talking about the same CBU product from USG.
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Unread 02-26-2020, 06:56 PM   #7
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Is this just a tub and you are tiling shower walls? Or a fiberglass tub/shower and your tiling the last 2’ to the ceiling? What’s throwing me off is you said it is tile direct on drywall now.
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Unread 02-27-2020, 12:43 AM   #8
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This is just a tub, and we are tiling above the tub.
Thanks!
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Unread 02-27-2020, 06:48 AM   #9
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Got it. If it was just the last 2’ to ceiling of shower/tub enclosure was gonna say you can go directly on drywall, no different than drywall above a surround. But doesn’t apply.
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Unread 02-27-2020, 10:23 AM   #10
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Pre-mixed mortar?

This may be taboo to ask...
But is there an acceptable premixed mortar that can be used for tiling wall (3x12 subway) on Durarock, and/or tiling floor (12x24) over existing tile?
Thanks!
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Unread 02-27-2020, 10:43 AM   #11
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Is this the application that asking about?
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Unread 02-27-2020, 10:56 AM   #12
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Yes.
Additionally the floor...
Thanks.
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Unread 02-27-2020, 11:25 AM   #13
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Scott, it'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered. A moderator can give it a more generic title any time you'd like to suggest one.

There is no such thing as pre-mixed mortar, no matter what it says on that bucket. The manufacturer should be ashamed at such deceptive packaging. What's actually in there is an organic adhesive, aka mastic. While you can technically use a Type 1 organic adhesive (ANSI A136.1) in your tub surround application, we don't recommend it. And if you'll read the installation instructions for that product I think you'll see that it's not suitable for your large format tiles in any application.

You want a thinset mortar for both applications. Something that comes in dry form to which you add water or a liquid additive.

My opinion; worth price charged.
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Unread 02-29-2020, 07:54 AM   #14
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Mortar

I’m trying to decide which mortar to use for the shower wall and the floor application, and if the same will work for both...
1) 3x12 subway tiles attached to Durarock in shower and drywall adjacent walls
2) 12x24 tiles installed directly on existing tiles, which are in good condition

I’m assuming thinset fortified, but got confused when I see large tile and when I see the crack resistant ones....
Thank you!!!
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Unread 02-29-2020, 08:23 AM   #15
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There are lot of them on the market, Scott.

Do you have a big box stores nearby where you normally shop for home improvement supplies?
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