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Old 10-17-2013, 01:31 PM   #1
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tiling around tub, durorock question...


so i have a new tub in and secured the flange to the studs. everything i have been reading says the durorock should come down over the flange and be 1/8" to 1/4" above the tub. well the flange as you can see adds maybe 1/8"-1/4" an inch thickness around the studs. Is it ok for the cement board to be pushed out a little further at the bottom due to the flange?
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Old 10-17-2013, 02:53 PM   #2
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tiling around tub, durorock question...


I'm sure you'll get professional advice on this, but this amateur having a similar issue with a flange on a cast acrylic shower pan. If you put the board over the flange, it bows out a little at the bottom, even though this method is in the Kohler installation guide for the pan. Both my contractor and some of the pros on this forum have suggested it's OK to rest the board on top of the flange so that the wall stays flat (and, in the case of my shower, stays even with the rest of the board on the entire wall). Then, after you go through the sealing/waterproofing steps for the wall, you use the tile to cover the flange.

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Old 10-17-2013, 04:07 PM   #3
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tiling around tub, durorock question...


Another option is to use furring strips on the studs the Durock attaches to.
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Old 10-18-2013, 08:06 PM   #4
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tiling around tub, durorock question...


They were not clear enough on the instructions; "3. Attachment
Place a 1/4 spacer strip or shim around lip of tub or shower
pan to hold bottom edge of cement board off lip." from; http://www.google.com/url?sa=t&rct=j...f7A_k8f3CvM_Yg

Fill with caulk/sealant that will give some when tub is filled with water/person. Been that way for years; 3rd para. from bottom; http://www.ctioa.org/reports/fr46.html

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Old 10-18-2013, 08:27 PM   #5
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tiling around tub, durorock question...


If you are tiling,set the board to the top of the flange---fill the resulting gap with thinset--then add your waterproofing --then tile.

Furring out the walls is seldom an option due to the problem of matching up the backer board to the drywall----
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Old 10-19-2013, 06:06 PM   #6
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tiling around tub, durorock question...


No need to furr as the cb stops 1/4" short of the flange/lip as per directions. If you don't use caulk there; and don't mind losing the manufacturers warranty, you could fill it with thinset as Mike said, or add flashing; http://www.google.com/url?sa=t&rct=j...2Qi6yxaqVetTEg

Things to watch for; http://www.google.com/url?sa=t&rct=j...nNWXFt5rx5cW2Q

DenShield, DensGuard, Ditra, Hardie, Fiberock, and your Durock all require a gap filled with caulk above the flange.

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Old 10-20-2013, 11:55 AM   #7
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tiling around tub, durorock question...


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Originally Posted by Gary in WA View Post
No need to furr as the cb stops 1/4" short of the flange/lip as per directions. If you don't use caulk there; and don't mind losing the manufacturers warranty, you could fill it with thinset as Mike said, or add flashing; http://www.google.com/url?sa=t&rct=j...2Qi6yxaqVetTEg

Things to watch for; http://www.google.com/url?sa=t&rct=j...nNWXFt5rx5cW2Q

DenShield, DensGuard, Ditra, Hardie, Fiberock, and your Durock all require a gap filled with caulk above the flange.

Gary
thank you, i did read the instructions but also research online showed a lot of people coming down over the flange with the cement board. if i stop above the flange, just caulk right over the screws in the flange?
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Old 10-21-2013, 07:13 PM   #8
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tiling around tub, durorock question...


Here is an alternative method to consider that involves setting the backer board on top of the flange and sealing with silicone (jumping to part ii). There is extra bracing to add between the studs to create a continuous solid backing, but it seems like a worthy "out of the box thinking" approach, but I'm not a pro so I can't really vouch for the method—yay or nay.

http://www.youtube.com/watch?annotat...&v=95-l9CKoRiE

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Last edited by ghutch; 10-21-2013 at 07:21 PM.
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