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Old 12-09-2013, 09:21 AM   #16
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What's behind that plastic tile in the shower? Do I really *want* to know?


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even with kerdi ?
I believe so. This is what Mike Holmes recommends.

The important reason to use cement board is because, if the cement board gets wet, it doesn't swell and disintegrate like drywall does.

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Old 12-09-2013, 09:03 PM   #17
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What's behind that plastic tile in the shower? Do I really *want* to know?


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I believe so. This is what Mike Holmes recommends.

The important reason to use cement board is because, if the cement board gets wet, it doesn't swell and disintegrate like drywall does.
i don't dare what he recommends. he isn't paying the bill.

ok, that makes sense. but when i did my kerdi shower a few years ago. schluter recommended regular drywall. i used the green drywall. idk if they changed their recommendations .
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Old 12-10-2013, 06:48 AM   #18
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What's behind that plastic tile in the shower? Do I really *want* to know?


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Originally Posted by JKeefe View Post
I believe so. This is what Mike Holmes recommends.

The important reason to use cement board is because, if the cement board gets wet, it doesn't swell and disintegrate like drywall does.

While I prefer cement board, Mike gets to work without a budget so that is nice for him.
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Old 12-23-2013, 12:02 AM   #19
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What's behind that plastic tile in the shower? Do I really *want* to know?


So just outta curiosity, what's the moisture-resistance difference between drywall, cement board, and plaster?
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Old 12-23-2013, 06:28 AM   #20
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What's behind that plastic tile in the shower? Do I really *want* to know?


None of the above are water proof--any water that works its way past the tile and grout will eventually let that water into your wall framing---

Cement board will not be damaged---it will still be whole when the framing rots away--

Plaster is some what tolerant of water---it was used as tub surrounds before showers were common---just to clarify things---the tub areas were not actually plastered,but were 'plastered' with a cement mortar--
Still--water would work its way through--soaking the framing---

Gypsum board dissolves when it gets wet---just mush with paper holding it together.

You must waterproof the face of the board with a paint on membrane or a fabric membrane if you want a 30 year shower---cutting that corner is foolish ,in my opinion----

A lot of hours and money go into building a shower---the money spent on waterproofing the surface is your insurance policy---

When looking at a collapsing shower, I have yet to hear someone say--" Gee, I'm glad I didn't spend money waterproofing the board.'
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Old 12-23-2013, 10:38 PM   #21
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What's behind that plastic tile in the shower? Do I really *want* to know?


...aaaaand now I'm terrified of my shower and think I'm going to make my family bathe outdoors forever. :P

Hmm... So I'm guessing that plaster and its cousins are waterproof in that if you splash some water on 'em, or get them wet, they'll be fine, but if you keep soaking them and soaking them, they let water through and eventually fail.

What's the first sign that you need to fix your surround? *Before* your second story collapses since the walls have rotted out? Is there something to watch for so you can fix things when they start to fail, rather than after they break?

Could you theoretically put tile up over a fiberglass surround, just to make it pretty?

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