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Old 05-29-2013, 09:49 PM   #1
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waterproofing shower walls


Doing a complete bathroom remodel. Have checked out several sites on preping walls to be waterproofed; they all seem to contridict each other. Some say you need to apply a wterproofing membrane and others say just Durarock is sufficent. Even watched two different episodes on DIY that showed one contractor installing a waterproof membrane over sheetrock, one using Kerdi and yet another applying tile directly to Durarock with no waterproofing. All contridicting each other; who is right and these are all representive of DIY Nwtwork

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Old 05-30-2013, 12:07 AM   #2
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waterproofing shower walls


Most would agree that you need to do one of the following:

1. Apply a liquid waterproofing coating, such as aquadefense, hydroban, or redguard.

2. Use a tilebacker which has a waterproof coating, such as denshield, and waterproof the fasterners and seams.

3. Use a waterproof membrane, such as the kerdi you mentioned.

Likewise, most would agree that drywall has no place in a shower.

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Old 05-30-2013, 05:54 AM   #3
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Tile and grout are not waterproof----some water or moisture will get through.

Durrock will also pass moisture---

To prevent that moisture from reaching the framing---Waterproof the face before tiling---

This is ideal--
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Old 05-30-2013, 10:02 AM   #4
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FWIW, DIY network is TV, not reality. And definitely not to be taken as a how-to on any subject.
I watch it on occasion. They are getting better, but even I see things (usually on older episodes) that make me cringe, thinking that is so wrong.

Edited to add: FWIW, when I did my shower a while back, I did a lot of research and this is what I came up with.

Waterproofing tiled shower walls.

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Old 05-30-2013, 10:33 AM   #5
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I put up a tub/shower with durock and redguard and it worked out great. The bond of the tile-thinset-redguard-durock was incredibly strong. So strong when we demolished the house 5 years later it was pretty much impossible to separate the layers. I wanted to save a small section of a marble listello and found the tile cracked WELL before any of the redguard unbonded from the durock or thinset.

Our new showers are all Kerdi, as it's a new build and one is a steam setup. But if I were doing it again myself and on a budget I'd still favor using cement board with redguard or some other applied barrier.

Our tile guy pointed out he found it better not to use the cement boards in steam setups as that tends to add to a musty sort of smell (as in, wet concrete in a locker room).
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Old 06-01-2013, 05:09 AM   #6
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Quote:
Originally Posted by cleveman View Post
Likewise, most would agree that drywall has no place in a shower.
It has a place under Kerdi. Those who refuse to use it are strangely paranoid about it.
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Old 06-01-2013, 05:10 AM   #7
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I wouldn't say those sources necessarily contradict each other. There are different ways to build a shower correctly.
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Old 06-01-2013, 10:22 AM   #8
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Quote:
Originally Posted by wkearney99 View Post
I put up a tub/shower with durock and redguard and it worked out great.
You could have stopped at that point too.
The rest is about appearance.

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...on a budget I'd still favor using cement board with redguard or some other applied barrier.
Think epoxy.
Garage floor roll on epoxy with the sprinkles.
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Old 06-01-2013, 10:55 AM   #9
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The upside to redguard, it seems to me, is that it's waterproof AND flexible. If there's any small shifting in the materials then there'd be at least some hope of continued protection.

But that's where using stiffer materials like cement backer instead of drywall come into play, especially on a wall. There you've got a more rigid bit of material to help prevent the motion of anyone pressing (or falling) against the wall from causing it to flex and crack.

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