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Old 10-08-2012, 09:15 PM   #16
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Waterproofing tiled shower walls.


Hey ohman, thanks for the "thank you" on the weep holes. It took me a long time to find that information so I thought it would be helpful for others. If the bath tub was going to just be a bath tub that you lay in without a shower head, it would definitely have been okay.

But since you are turning this into a shower with a shower head close to the ceiling, there needs to be some form of waterproofing based on what the shower experts say. Otherwise, over time, mold will form I believe, but you just won't see most of it since it will be hidden behind walls.

Having said that, I once spoke to a man online that worked on building houses (he mostly did trim but is a very handy guy) and when he redid his own shower he just put up CBU and tiled as well (he posted this on youtube, here is the link: ) . He even said that was how they did it in the houses they worked on and he felt that would be enough for waterproofing. I can tell you in advance that most experts on this forum would disagree with him and tell you that you do need some waterproofing (since tile, CBU, and thinset are not waterproof).

So I don't know from long term experience how worried you should be, but the short answer is that your worker did leave an important step out of the process and should have waterproofed it if there will be a shower head installed.

And the remedy for this... I really don't know other than removing the tile, then adding Redgard/Hydroban (or some other waterproofing method) to the CBU, then retiling. I know that sucks to hear, but if there is another way to fix this, the experts in the plumbing/remodeling section will know best.

And lastly, I would probably post this question in the plumbing or remodeling forum for advice rather than this thread. You will get more information there, plus blondesense wanted to keep this thread free of questions and keep it more as an informative how-to section.

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Old 11-06-2012, 07:50 AM   #17
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Waterproofing tiled shower walls.


Hello Everybody,


Last I had bought a new house but did not pay attention to waterproofing my bathroom tiles as a result it got molded any ways I contacted some people and they brought things in right order. I hope I would have read this article last year, then things would have been really different. Thanks for posting up such an important topic, I will make use of these tips in my kids bathroom whenever I get it remodeled.
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Old 04-28-2013, 09:22 AM   #18
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Waterproofing tiled shower walls.


if you truly want to water proof your job... you need to start with products
that are in themselves truly water proof...

look up wedi products.. these boards are completely water proof and make tiling a snap... any DIY can master the art
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Old 04-30-2013, 09:53 AM   #19
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Waterproofing tiled shower walls.


I know this is a old post. But before one lays the first tile. To water proof a tile shower the best product to use is Hydro ban from Laticrete. yes it is expensive but it is the best on the market.
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Old 04-11-2014, 10:05 AM   #20
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Waterproofing tiled shower walls.


Quote:
Originally Posted by Blondesense View Post
Kate, this is the how-to section. If you have a question you are better off starting your own thread in one of the discussion forums.
I don't see any questions she's asking in her post - just information.

I use exclusively Kerdi over drywall. I'm sure you can get the other methods to work too, but this is a niche that can distinguish me from all the "me too" guys. Of course, it also distinguishes me from the "me too" guys who don't waterproof at all
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Old 06-06-2014, 12:23 PM   #21
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Waterproofing tiled shower walls.


I have to add a vote for wedi. Especially for a DIYer. While the system may be more expensive than other options, it has fewer components, fewer steps, and pretty darn simple to work with. Not to mention that it's 1/2" thick and 100% waterproof versus sheet membranes and liquids at 40mil (that's 0.004").

Understand what you're putting in your shower system. If you're intent on doing it right the first time; do your homework.

Don't just consider the attributes of a single component, consider that components effect on your other components. Example: Tile manufacturer recommends using a specific type of adhesive but the backer manufacturer recommends something different. Which adhesive do you use? What happens if something fails?

I have a question about the orange stuff: Where the material has seams and corners, you're supposed to use non-modified thin-set (not waterproof) to adhere the sealing strip over the joints, right? Seems counterintuitive to bond two waterproof products together with a product that's not waterproof. Am I missing something?

Remember, if you're a DIYer (which we all are) know what you're getting yourself in to before you start. Do your research, make a plan and stick to it.
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Old 06-06-2014, 12:37 PM   #22
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Waterproofing tiled shower walls.


Quote:
Originally Posted by GB Greg View Post

I have a question about the orange stuff: Where the material has seams and corners, you're supposed to use non-modified thin-set (not waterproof) to adhere the sealing strip over the joints, right? Seems counterintuitive to bond two waterproof products together with a product that's not waterproof. Am I missing something?
Lapping of the membrane is required when using thinset to join the two, a minimum two-inch overlap is the requirement.

KERDI-Fix can also be used but the minimum two-inch overlap is still required.

Modified thinset is also permissible.
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Old 06-06-2014, 02:29 PM   #23
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Waterproofing tiled shower walls.


Quote:
Originally Posted by GB Greg View Post
I have a question about the orange stuff: Where the material has seams and corners, you're supposed to use non-modified thin-set (not waterproof) to adhere the sealing strip over the joints, right? Seems counterintuitive to bond two waterproof products together with a product that's not waterproof. Am I missing something?
That's a good question, because thinset is not waterproof. The overlap recommended by Schluter does not make the Kerdi act like roof shingles to shed water (for example, it doesn't matter which direction they are overlapped.) The answer is that the little fibers in the Kerdi penetrate or extend into the wet thinset and break the wicking property of water so water can't penetrate. This is why it's important to mix the thinset a bit on the wet side but most importantly install the Kerdi while the thinset is fresh and wet and press the membranes together well and squeeze out excessive thinset as directed. Actually a 1/4" inch overlap would work, but Schluter specifies 2" to be on the safe side.

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