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Cement Board &shcullter System

 
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Old 04-06-2010, 09:04 PM   #1
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Cement Board &shcullter System


My dry wall guy put up the cement board with dryall screws,i know should use the green special screws but before the tiler tiles the shower enclosure he is waterproofing all the walls with the schulter waterproffing orange membrane.My thinking is as its going to be waterproffed i should let it go that theres drywall screws.But my tile guy has slagged off the drywall guy to my customers dad?what do you think???
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Old 04-06-2010, 09:07 PM   #2
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Re: Cement Board &shcullter System


Uh Oh! I'm afraid you just laid the groundwork for WWIII here.

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Old 04-06-2010, 09:37 PM   #3
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Re: Cement Board &shcullter System


I believe the issue is the alkalinity of the cement board corroding the drywall screws. Does it really? I dont know... In my area of the country, I've pulled out a few cement board showers with drywall screws, and the screws were in decent shape. I suppose it's a gamble. What's a box of the greenie's cost?

Oh, you'd better correct your spelling of Schluter... Angus get's very defensive about such things...

(kidding A-)
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Old 04-06-2010, 09:38 PM   #4
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Re: Cement Board &shcullter System


Well it would probably be fine but it does void warranties for both products I'm sure.

So......
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Old 04-06-2010, 10:16 PM   #5
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Re: Cement Board &shcullter System


I thought the membrane could go directly over the drywall? Why add cement board if it's not needed?
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Old 04-06-2010, 10:27 PM   #6
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Re: Cement Board &shcullter System


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I thought the membrane could go directly over the drywall? Why add cement board if it's not needed?

my customer wanted it even though i told him is was not needed,13 to 14 hours a day working scrw the spelling?

so its the alcaline that could damage the screws, i like my drywall guy and just thought the tiler was out of order slagging him off.
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Old 04-07-2010, 12:05 AM   #7
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Re: Cement Board &shcullter System


The use of alkali-resistant screws is so there isn't a chemical reaction between the thinset and the metal. Not sure how long this corrosion takes to occur.

If guys are still putting tile over 3/4" subfloors, not using vapor barriers with CBU in showers and using mastic in wet locations...I don't really think the world's gonna end on you.
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Old 04-07-2010, 12:15 AM   #8
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Re: Cement Board &shcullter System


Quote:
Originally Posted by Splinter View Post
Angus get's very defensive about such things

Yeah....what the F is &shcullter
?




That's just plain offensive..
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Old 04-07-2010, 01:11 AM   #9
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Re: Cement Board &shcullter System


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Oh, you'd better correct your spelling of Schluter
I think even RS is offended....
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Old 04-07-2010, 01:18 AM   #10
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Re: Cement Board &shcullter System


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Originally Posted by angus242 View Post
I think even RS is offended....
I sure as heck am! I hate bad spelling.

OMG what am I doing up this late?

Hint-day off tomorrow so I will be littering the forum with my usual smack---only earlier!
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Old 04-07-2010, 07:58 AM   #11
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Re: Cement Board &shcullter System


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Why are people still using cement board if using schluter?
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Old 04-07-2010, 08:53 AM   #12
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Re: Cement Board &shcullter System


that was denshield.
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Old 04-07-2010, 10:04 AM   #13
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Re: Cement Board &shcullter System


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Wow! you'd even ban the dude for that, eh? You ARE hardcore Schulter... I mean Schluter....

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Old 04-07-2010, 10:43 AM   #14
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Re: Cement Board &shcullter System


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Wow! you'd even ban the dude for that, eh?
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Old 04-07-2010, 03:49 PM   #15
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Re: Cement Board &shcullter System


You do need an alkai-resistant screw if you work with cement because drywall screws will react with the product (I think the screws react with the board and not the thinset but I could be wrong). Oddly enough I was just talking about tile backers in another thread but I don't use cement board anymore and I use a product called GREENE-BOARD. You can use regular drywall screws with this product and they don't react with the board.

It's almost redundant placing a tile backer behind the Ditra system but I think they do recommend it. I love the system but damn it can be pricey.
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Old 04-07-2010, 04:11 PM   #16
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Re: Cement Board &shcullter System


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(I think the screws react with the board and not the thinset but I could be wrong)
Cement is alkaline. There is cement in thinset.

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