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Old 02-24-2008, 10:12 PM   #1
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Concrete Board in shower, need help please!


I just installed concrete board in a shower in preparation for tiling. I installed it with the smooth side out, but now reading more (which I should have done before) I'm thinking I should have put the rough side out. Can someone tell me if the smooth side will work or do I need to take out and redo. I really don't want to have to rip all of it out but I'd rather know now.

Thanks!

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Old 02-24-2008, 10:16 PM   #2
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Concrete Board in shower, need help please!


I know that the smooth side is for mastic which shouldn't be used in a shower and the rough side is for thinset. Can you use thinset with the smooth side? I'm not sure. Hopefully someone else will be along to answer that.

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Old 02-24-2008, 10:28 PM   #3
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Concrete Board in shower, need help please!


I never saw any insrtuctions relating to smooth vs. rough on the instructions pasted on the board. I wouldn't worry about it. But if you are, contact the manufacturer and ask them.
Ron

From the Durock website:
Dual surface texture - use mastics on smooth side for bonding material economy, and thin set mortars on the rough side for improved resistance to tile slip during installation.

Shouldn't make any difference in the tile install. I use a ledgerboard for tile stabilization at the bottom, so the tiles aren't slipping anywhere.

Last edited by Ron6519; 02-24-2008 at 10:34 PM. Reason: additional info
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Old 02-24-2008, 10:36 PM   #4
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Concrete Board in shower, need help please!


This is a quote right from USG website for the durock brand cement board. Dual surface texture - use mastics on smooth side for bonding material economy, and thin set mortars on the rough side for improved resistance to tile slip during installation

Here is the link, scroll down to find it. http://www.usg.com/navigate.do?resou...ment_Board.htm
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Old 02-24-2008, 10:38 PM   #5
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Concrete Board in shower, need help please!


Ron, thanks a lot for the help. I was hoping it was just a little more grip for slipping as well, but I'm planning to use a ledger as well.
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Old 02-25-2008, 03:26 AM   #6
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Concrete Board in shower, need help please!


Quote:
Originally Posted by Ron6519 View Post
I never saw any insrtuctions relating to smooth vs. rough on the instructions pasted on the board....
There's either a sticker or printing (dependant on the manufacturer) on every sheet of cement board that states which side goes outward (towards the tile).

There shouldn't be problem.
Tho, for others planning on installing cement board, they should try and adhere to the maufacture's instructions on this.

Last edited by AtlanticWBConst.; 02-25-2008 at 03:41 AM.
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Old 02-25-2008, 06:37 PM   #7
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Concrete Board in shower, need help please!


I had an extra sheet and went back and looked at the sticker. Unless I missed it I didn't see anything stating which side should be out. I would think most people would put the smooth side out since it looks like the "finished" side. Thanks for all the help.
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Old 02-25-2008, 07:18 PM   #8
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Concrete Board in shower, need help please!


I didn't see anything either...However I did ask my contractor before installing and I asked if it went like this ( smooth side out) he said it was fine, and it was inspected as well and passed with flying color,
The inspector asked if I was gong to tile I told him yes he just said ok...had no problem.

oooppp's I found it...It's more like a MSDS lable but it states:smooth side mastic, rough side mortar. hmmm...I will think on this one and figure out the best way to handle this...I think I will be fine. I'm doing a walk in shower that is 4x7 so I hope its fine.

No worries I'm pretty good at improvising
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Old 02-27-2008, 11:56 AM   #9
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Concrete Board in shower, need help please!


After learning about the smooth side and rough on the concrete board I was thinking all that work.

so the solution I came up with was getting a product called Red gard "By Custome Building supply" I was going to roll the membrane on the cement board to create a rougher texture and this I know for sure would have worked...It can be applied to cement board and is ready for mortar tiling Glad it took the time to learn about special coatings over the years in the trades

[quote=floxy;101427]I just installed concrete board in a shower in preparation for tiling. I installed it with the smooth side out, but now reading more (which I should have done before) I'm thinking I should have put the rough side out. Can someone tell me if the smooth side will work or do I need to take out and redo. I really don't want to have to rip all of it out but I'd rather know n
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Last edited by tverhoef; 02-27-2008 at 11:59 AM. Reason: edit
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Old 02-27-2008, 02:23 PM   #10
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Concrete Board in shower, need help please!


Use rough. I always have for tiling. It will bond much better.
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Old 02-27-2008, 03:45 PM   #11
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Concrete Board in shower, need help please!


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Use rough. I always have for tiling. It will bond much better.
that was why I came up the idea in my last fourm message but thanks
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Old 02-27-2008, 03:49 PM   #12
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Concrete Board in shower, need help please!


Seems like it's just a waste of money to do that when you could theoretically take it off, flip it, and put it back on.
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Old 02-27-2008, 03:59 PM   #13
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Concrete Board in shower, need help please!


Quote:
Originally Posted by McGaw View Post
Seems like it's just a waste of money to do that when you could theoretically take it off, flip it, and put it back on.
I have cuts that wont match up if I flip them and well I tend to think that my time is money. If you think about it I need to seal the seams anyway plus it just adds extra protection to the shower and will create a rougher surface for the mortar.

I was told by a contractor once you can never to to much when it comes to waterproofing inside a house.
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Old 02-27-2008, 04:46 PM   #14
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Concrete Board in shower, need help please!


Why wouldn't the cuts line up? If anything, it would be the screw holes.
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Old 02-27-2008, 07:47 PM   #15
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Concrete Board in shower, need help please!


Here's the response I got from USG (manuf of durock)

" Yes you can install the smooth side out for thin set mortar we recommend the rough side because of the heavier texture it will accept more mortar in the texture."

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