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Old 05-08-2017, 07:58 PM   #1
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Used water resistant drywall in shower


I just did my shower surround and used water resistant drywall. Then I tiled over it. Guy at store said would be fine but I guess he wasn't much of an expert. Now researching online and finding out I screwed up and should have used cement board or kerdi. Is there anything I can use to completely waterproof the tiles and grout (other than the spray on sealant) I don't want my walls to fall apart in 3 years. Any help appreciated!
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Old 05-09-2017, 12:19 AM   #2
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Re: Used water resistant drywall in shower


About all you can do at this point is what they used to do before cement board and/or Kerdi became popular.
Use a grout sealer and hope the drywall doesn't get moldy.
Silicone caulk at the corners.

They lasted years if done correctly. Three years was considered a failure.
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Old 05-09-2017, 02:53 AM   #3
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Re: Used water resistant drywall in shower


Billsticky,

Is this a shower stall or tub surround?

Not much you can do now except to keep an eye on it, checking for cracked grout to repair.

Grout sealer isn't going to help with waterproofing, it's not for that.

If this isn't a shower, you may be ok for some time.

Jaz
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Old 05-09-2017, 05:41 AM   #4
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Re: Used water resistant drywall in shower


Years ago that was what everyone said to do. When I was a little kid we did my parents shower that way. We had 4 people in the house taking showers everyday. I would guess it must have been 25 years later before they moved and the shower tile was still going strong.

I wouldn't recommend doing it nowadays but what's done is done.
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Old 06-06-2017, 05:29 PM   #5
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Re: Used water resistant drywall in shower


Green board can be enough to get by, but it needs some kind of waterproof membrane. I dislike using Kerdi and Redgard mats, solely on personal preference, but I always grab me a 3 gallon bucket of liquid Redgard and some fiber tape, that could help you for the next time, at least.
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Old 06-07-2017, 07:50 PM   #6
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Re: Used water resistant drywall in shower


Greenboard should not be used in wet areas, but some people will do it anyway.

Wallboard including GB, where specifically "outlawed" in the International Residential Code as of Jan 1, 2006 for use in wet areas. But not every jurisdiction abides to all codes, and cheap-a$$ builders and DIYers just wanna save $$, and worry about the results later.

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Old 06-09-2017, 05:31 PM   #7
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Re: Used water resistant drywall in shower


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Originally Posted by JazMan View Post
Greenboard should not be used in wet areas, but some people will do it anyway.

Wallboard including GB, where specifically "outlawed" in the International Residential Code as of Jan 1, 2006 for use in wet areas. But not every jurisdiction abides to all codes, and cheap-a$$ builders and DIYers just wanna save $$, and worry about the results later.

Jaz
Had not known that green board was outlawed. Never have used it myself, I'm quite stuck in my Hardie Backer ways, but I was told that provided it was fully waterproofed, it was acceptable, and this was very recently March), by a home builder who has been at it for 30+ years. Thank you for educating me on that, Jaz.
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Old 06-09-2017, 05:38 PM   #8
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Re: Used water resistant drywall in shower


Quote:
Originally Posted by jlhaslip View Post
About all you can do at this point is what they used to do before cement board and/or Kerdi became popular.
Use a grout sealer and hope the drywall doesn't get moldy.
Silicone caulk at the corners.

They lasted years if done correctly. Three years was considered a failure.
JHASLIP 100% ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

A 1978 home I moved into, had GB in the master bath/shower that lasted till late 90's when I replaced.

Don't sweat it.... but no banging on it.

Good luck
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Old 06-09-2017, 06:26 PM   #9
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Re: Used water resistant drywall in shower


Big Earl,

Hardie Backer and most others are waterproof in that they are not adversely affected by water when used as directed. They do NOT however make an installation "waterproof" as in keeping the water from intruding through or past it to the other side.

As you can see there are at least 2 definitions of the word waterproof.

Jaz
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Old 06-12-2017, 10:27 AM   #10
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Re: Used water resistant drywall in shower


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Had not known that green board was outlawed.
I think Jaz was only saying outlawed for wet areas, aka showers. I'd still use it over regular gyp board in Kitchens and the rest of the bathroom.
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Old 06-12-2017, 02:31 PM   #11
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Re: Used water resistant drywall in shower


How did it work and how are things now?

Jack

http://www.wichitatrees.com/local-tr...-services.html

Last edited by Wichita Tree; 06-12-2017 at 02:32 PM. Reason: wrong link
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Old 06-14-2017, 01:54 AM   #12
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Re: Used water resistant drywall in shower


Quote:
Originally Posted by Bret
I think Jaz was only saying outlawed for wet areas, aka showers.
Yes right, that's what I said in #6.

Quote:
Originally Posted by Jaz
Wallboard including GB, where specifically "outlawed" in the International Residential Code as of Jan 1, 2006 for use in wet areas.
There's controversy whether using GB anywhere where one might is really better than regular wallboard after it's primed and painted.

One thing most people don't know is that GB is weaker than regular wallboard. In other words it's not as stiff and has been tested to sag if installed at 24" oc. Therefore when installing GB on ceilings you're not supposed to install if the ceiling trusts are 24" oc. It will sag, guaranteed. However, I doubt 5% of the drywall guys know this, and probably less home inspectors from our building departments. .

Jaz
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Old 06-14-2017, 04:54 AM   #13
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Re: Used water resistant drywall in shower


Quote:
Originally Posted by JazMan View Post
Yes right, that's what I said in #6.



There's controversy whether using GB anywhere where one might is really better than regular wallboard after it's primed and painted.

One thing most people don't know is that GB is weaker than regular wallboard. In other words it's not as stiff and has been tested to sag if installed at 24" oc. Therefore when installing GB on ceilings you're not supposed to install if the ceiling trusts are 24" oc. It will sag, guaranteed. However, I doubt 5% of the drywall guys know this, and probably less home inspectors from our building departments. .

Jaz
I can't imagine using it on a 24" OC ceiling with R-49 cellulose on top and I don't think they make it in 5/8". Doesn't seem like a good idea to me. All the drywallers I've hired told me it was a gimmick and to use regular.

Drywall has enough problems, don't need to add to it.
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Old 06-14-2017, 05:56 AM   #14
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Re: Used water resistant drywall in shower


IMO greenboard isn't needed in a bath rm. Everyone knows the benefits of using cement board behind tile in wet locations but painted regular drywall is fine elsewhere in the bath rm including the shower ceiling provided it's primed and coated with a latex enamel [preferably a bath paint]
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Old 06-14-2017, 07:54 PM   #15
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Re: Used water resistant drywall in shower


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IMO greenboard isn't needed in a bath rm. Everyone knows the benefits of using cement board behind tile in wet locations but painted regular drywall is fine elsewhere in the bath rm including the shower ceiling provided it's primed and coated with a latex enamel [preferably a bath paint]
Primed and coated with PM200
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