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Unread 02-14-2019, 04:33 PM   #1
Rayf2018
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Tub/Shower Install Questions

Afternoon all.

I have removed a stand up shower and have replaced it with a new bathtub and fixtures in my basement bathroom. I ended up using green board for the walls which I plan to tile over as that is what i had used in my last one. However I have done some reading and people tend to lean to other materials.

Instead of ripping out the green board, can I still use it by doing the following:

1. Mud and tape the joints/screw holes.

2. Roll Red Guard over the entire area.

3. Tile/groat.


?
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Unread 02-14-2019, 04:41 PM   #2
claycarson
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Ray,

Yes, you can. I'd still prefer cement board, cuz I don't trust water, but full coverage all the way up is better than plain greenboard.

Kerdi is also an option, goes on with thinset, but takes some getting used to.

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Unread 02-14-2019, 04:52 PM   #3
Rayf2018
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Should I rip it all down and replace it with cement board? I am just trying to save some money by not wasting what I have already done. But if its that much better I will. I know I do good work and I take a lot of time in prep etc so if a coat of red guard over the green board will provide adequate water protection I'll still use it.

I just dont want a bad wall.
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Unread 02-14-2019, 05:18 PM   #4
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Hi Ray,

Two coats of RedGard are required. If the shower is not used daily it'll probably hold up. If it's used daily I would replace the drywall with cement board.
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Unread 02-14-2019, 06:01 PM   #5
Rayf2018
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Well, I guess I will pull it out then. Oh well.

Are products like durock or wonderboard what to use? Do I still need to redguard it?
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Last edited by Rayf2018; 02-14-2019 at 06:26 PM.
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Unread 02-14-2019, 08:27 PM   #6
Rayf2018
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OK I took it all down. Purchased wonderboard and ill motor the joints with tape, then follow up with Red Guard.

Question. What is the best way to cut the holes for the fixture in the cement board?
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Unread 02-14-2019, 09:23 PM   #7
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Unread 02-22-2019, 07:47 PM   #8
Rayf2018
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Floating shower wall

I have my cement board up and am about to thinset the joints and tape before I go ahead and redgaurd. I however have noticed there is a bow in part of one of the walls, along with one corner being a bit level with the rest of the wall, likely due to studs being inset more than the others. The bow is inwards in both locations.

My plan was to float those spots of the walls with thinset and a 1/4" trowel first, then level out with a long level so the ridges are flush with the rest of the wall. Let it dry, then thinset over with the flat edge so those portions of the walls were level with the rest. Then redgaurd, then tile.

Any issues with this? I notice some people when the float a whole wall they used the chicken type wire? Do I have to do this? I'm talking like a 1/4 or so at most in thickness at some spots.

Thanks.
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Unread 02-22-2019, 07:56 PM   #9
Lou_MA
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Thinset isn’t meant to be used to flatten surfaces.

You should alkali-tape and thinset the backer board seams, let dry, then use a cement-based patching compound to flatten the walls. Something like Laticrete Skim or NXT. Let dry, then RedGard.

And no - you don’t need to use wire. That’s when you’re floating out walls with 1- or 2-coats of fat mud.
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Unread 02-22-2019, 08:25 PM   #10
Rayf2018
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Ok, have any suggestions on product names for that? I can use the Flexbond LFT thinset for the alklai tape and the tiles. But for the floating, any suggestion on producT?
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Unread 02-22-2019, 10:45 PM   #11
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There are many options. See my post above for one recommendation.
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Unread 02-23-2019, 09:21 PM   #12
Rayf2018
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Vapour Barrier basement bathroom and RedGaurd

Hello,

I have a new tub installed in my basement bathroom and put up cement board over the vapour barrier. I then mesh taped the seams with the proper tape and thinset the joints and screw holes.

My plan was to use Redgaurd, however I have now read you shouldn't use Redgaurd with a vapour barrier behind the cement board? Should I just bypass the redguard now or what?

Sigh...
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Unread 02-23-2019, 10:06 PM   #13
muskymike
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Hi Ray, if you have the vapor barrier you don't need the Redgard.
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Unread 02-23-2019, 10:35 PM   #14
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Ray, I've again combined your new thread with your previous project 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.
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Unread 02-23-2019, 11:04 PM   #15
Rayf2018
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Sorry, I should have combined them first, Thank you!

Ok good, because I didn't want to tear it down. Two more questions for now.

1. Could I still red guard the joints, corners and approximately 18" up from the top? This would produce a waterproof membrane around most the areas that will get the most water while the shower is in use.

2. There is approximately a 1/8" to 1/4" gap between the wonderboard and the tub flange. You can see the studs/vapor barrier. Do I just tile over that and have the tile come down over the flange to the top of the tub, then silicone the tile/tub all the way around. Or do I have to fill that small gap between the wonderboard and tub flange first?

Thank you for the help guys.
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