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Unread 10-12-2019, 06:30 PM   #1
e3
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Wall board

For those of you that use Dry Wall for your substrates for a shower walls, how much additional would you charge to use CBU instead? [yes a membrane would be going over it)
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Unread 10-12-2019, 08:29 PM   #2
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All other things being equal, $125 for up to a 3x5 shower.
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Unread 10-13-2019, 03:47 PM   #3
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This is just input, but I think one of the perks of wallboard is that the drywallers install it as opposed to the tile installer. So the difference in price might be greater than what would be advertised here.
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Unread 10-14-2019, 05:49 AM   #4
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Is this a trick question?
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Unread 10-14-2019, 06:52 AM   #5
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nope--just trying to see how much cheaper it is to use drywall instead of other..
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Unread 10-14-2019, 01:05 PM   #6
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Thought drywall was not allowed in a wet area anymore. I personally have never used it in a wet area. Have torn out many wet sheets of it though!!
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Unread 10-14-2019, 01:16 PM   #7
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you are correct it was removed from ANSI and TCNA as a recommended product for wet areas. With that said, there are still people that doing it and recommending it. The only reason would be price. I don't think anyone thinks its better..
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Unread 10-16-2019, 07:05 AM   #8
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Here we go again, Eric.

Drywall with a waterproof membrane on it's surface is not banned. Plain drywall under tile in wet areas is banned. I know the wording. I also know the intent. Schluter, to my knowledge, is the only company still recommending drywall, and it's fine.

And as far as the Handbook is concerned, manufacturers' specs. trump it.
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Unread 10-16-2019, 07:31 AM   #9
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Fat mud goes over both the same, much quicker into drywall though. Difference of a half day of labor plus material. $275 to $750 (if you’re Paul).
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Unread 10-16-2019, 07:11 PM   #10
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John -I guess you can make that same argument about particleboard. I don’t believe any of the manufactures of gypsum board recommend their product to be installed in the application, if they did they would say must have membrane installed over it! They don’t! As for the" intent" I guess only one Co. knows it then. Mapei,Custom,Laticrete,Ardex,GP,National,Hardy,Noble,Etc must have missed understood it.
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Last edited by e3; 10-17-2019 at 08:18 AM. Reason: hAR
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Unread 10-19-2019, 06:46 AM   #11
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Yeah, I think all you guys might have to go back to tile setting school.
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Unread 10-19-2019, 07:12 AM   #12
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Actually, I think it's the ICC that misunderstood it, Eric.
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Unread 10-19-2019, 07:35 AM   #13
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The moisture is not escaping through the membrane so it can only go into the paper facing. ( a great food source ) There is a worry over the moisture between porcelain tile and the membrane not being able to escape but not between drywall and the membrane? I was just with some of the board manufacturers and they said the gypsum association itself does not want it in wet areas nor to they as the producers. What good reason is there to use it when there are so many better choices?
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Unread 10-19-2019, 08:02 AM   #14
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Quote:
Originally Posted by e3
The moisture is not escaping through the membrane so it can only go into the paper facing.
Mmmm, in the shower application under discussion the moisture would be on the side of the membrane opposite the drywall paper, no? If you're just trying to confuse me, it's working.

You're certainly more in tune with the industry manufacturers than I, Eric, but I don't recall that it was the drywall manufacturers who lobbied for this change when it was made. If they now find themselves in favor of the restriction as it's currently written, I'd actually be surprised. If they were in favor of not using their products as backing material for direct bonding of tile in such wet areas, I could certainly understand that, of course, but their being opposed to the use of their products behind an appropriate waterproofing membrane would surprise me. Following the industry political tide would more likely explain such opposition at this juncture.

In my discussion with at least two of the direct bonded waterproofing membrane manufacturers on your list above, other than the one with the ICC ER, in a candid moment they said they'd be quite comfortable for their product to be applied over gypsum drywall in a standard shower application.

I still maintain that the change in usage recommendation and code wording is not in line with the original intent, which was to stop the direct bonding of ceramic tile to gypsum wallboard in wet areas. And I'm certainly in favor of not doing that.
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Unread 10-19-2019, 08:58 AM   #15
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They were not in favor of the change but accepted it was going to happen and used the occasion to sell a premium rather than commodity product. I was there for much of the conversation including before and after the code cycle meeting. I remember several conversations very distinctly where profits were a large part of the conversation.
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