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Old 04-17-2014, 11:32 PM   #1
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Waterproofing tiled shower walls.


I'm new to this forum, not exactly sure how to use it. I'm building my own custom walk in shower for the first time. I have a question about waterproofing shower seats. I already have installed the plumbing, pre pitch pan (with tarp paper, metal lath, the pre pitch system and mortar). I'm debating how to proceed to waterproof my 2 corner shower seats. For the rest if the shower I'm planning on using 6mil vapor barrier, cement board, mesh tape, thinset, then roll on water proofing liquid. Do I just treat the seats like the walls (I don't think I should) or use extra 40mil shower plan liner to drape over, then cement board. Help and thanks! Here are some pictures.
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Old 04-18-2014, 05:02 AM   #2
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You could always use drywall and Kerdi and be done with it :-)
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Old 04-18-2014, 05:33 AM   #3
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Thanks. What about a compromise of the traditional way and kerdi for the seats? kerdi is expensive, I'm running out of money....


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Old 04-18-2014, 06:38 AM   #4
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The seats where built wrong.
The framing should have been built as you where building a wall with top plates, not just supported on 2X standing on end.
Also looks like you use CDX plywood to make the seats, should have been A/C subfloor rated. CDX is full of voids in the plys.
There also should have been 2X's laying flat nailed to the studs to act as nailers to support the seat where it meets the wall.
The way it's built now the seats going to flex and there's no good way to attach anything to the face of the seat.
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Old 04-18-2014, 01:54 PM   #5
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I don't think there's much value in combining Kerdi with other waterproofing methods.
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Old 04-18-2014, 10:13 PM   #6
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Thanks for your help. And as far as the framing of the seat go's I understand what your saying. I can't change much without ripping it out. I will try to some more support to the walls.


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Old 04-18-2014, 10:23 PM   #7
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Sleepy,

Which liquid waterproofing will you be using and how many coats? Got a wet film gauge?

You said you're installing 6 mil plastic on the studs? Don't do that. Install the liquid membrane instead. I would have recommended Kerdi instead but............ I doubt it's gonna be much cheaper to go liquid if you apply the proper amount.

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Old 04-18-2014, 10:46 PM   #8
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I still haven't made a final decision. I'm thinking about RedGuard or something similar. I will be getting a film gauge. I need to cover about 150 square feet of wall. I believe 2 coats, so I should need about 3 gallons..so.. $150. My estimate for kerdi about $300 for the membrane and $50 or more in the seams and thinset.

About the 6mil plastic. You say "no, install the liquid membrane instead". Don't I need a vapor Barrier with the liquid membrane? I believe roll on "waterproof" membranes are still permeable to water vapor. I know with kerdi I would not need a vapor barrier.


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Old 04-18-2014, 11:21 PM   #9
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Quote:
Don't I need a vapor Barrier with the liquid membrane?
Go read this;http://www.custombuildingproducts.co...am__shower.pdf

Jaz
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Old 04-18-2014, 11:34 PM   #10
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Thanks JazMan! I'm excited to read that.


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Old 04-18-2014, 11:42 PM   #11
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I'm happy too.

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Old 05-19-2014, 09:13 PM   #12
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Hi guys, i'm also trying to build a shower, I bought the liquid waterproofing membrane already, but i'm bit so sure as to which material/tape or whatever else I need to secure the corners/edges and such just to full proof the shower. PLEASE HELP ! I need to know the name for it. I think its some kind of felt looking mesh.
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Old 05-20-2014, 07:07 AM   #13
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Use cement board to cover all areas, use a mesh tape made for cement board and a thin set to mud all seams. Make sure to scape the thin set flat. I found out the hard way, high point are hard to knock down. Then roll on water proofing membrane. Just read all the directions for each product.


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Old 05-20-2014, 07:08 AM   #14
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This is how my shower turned out!


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