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August 16, 2010, 05:05 PM
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#1
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One of the Irregulars
Join Date: Aug 2010
Location: Central Vermont
Posts: 12
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Backer board and tub flange issue
I do have one other question on a slightly different topic if anyone could help.
I just installed the tub ( kohler archer) and the instructions have you install a 1/4" block over the nailing flange at each stud so the backer board sits flush with the outside of the tub flange.
This is causing my backer board to be pitched out at the bottom and makes if impossible to have square angles for tiling. So I was thinking of adding 1/4" shims all the way up the studs so the backer is square. Yes/ No?
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August 16, 2010, 05:08 PM
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#2
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Hard Surface Installer
Join Date: May 2006
Location: Idaho
Posts: 2,697
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If that keeps it flush, then i would say yes.
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August 16, 2010, 05:10 PM
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#3
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a Floor Pro
Join Date: Jun 2006
Location: Sauk Centre, Minnesota
Posts: 3,975
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Is shimming going to cause problems elsewhere? 
Following plumbers directions = :crazy:
Notch your studs instead of adding 1/4"
Last edited by stullis; August 16, 2010 at 05:18 PM.
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August 16, 2010, 05:13 PM
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#4
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Administrative Assistant
Join Date: Sep 2007
Location: Boise, Idaho
Posts: 6,798
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stullis said
Is shimming going to cause problems elsewhere?
Following plumbers directions = :crazy:
Notch your studs instead of adding 1/4"
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Such as where the backer meets the existing sheetrock?
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August 16, 2010, 05:19 PM
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#5
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Hard Surface Installer
Join Date: May 2006
Location: Idaho
Posts: 2,697
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Maybe I am misunderstanding??? are you trying to "fir out" the studs to keep the flange slightly recessed so the tile will be plumb???or is the flange already recessed???
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August 16, 2010, 05:19 PM
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#6
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a Floor Pro
Join Date: Jun 2006
Location: Sauk Centre, Minnesota
Posts: 3,975
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You got it Barry. 
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August 18, 2010, 06:24 AM
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#7
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One of the Irregulars
Join Date: Aug 2010
Location: Central Vermont
Posts: 12
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hookknife said
Maybe I am misunderstanding??? are you trying to "fir out" the studs to keep the flange slightly recessed so the tile will be plumb???or is the flange already recessed???
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sorry for late replay, my post got moved. The directions for the Kohler tub have you put 1/4" thick 1.5X4 strips on each stud above the nailing flange of the tub which is about 1/4" thick, this will allow the backer board to sit flush against the tub flange. Problem I'm facing is that the rock board is pitched out at the bottom because of the wood strips, especially where 2 corners meet . This ruins all the square angles for tiling and just looks wrong. I've already found some issues with kohler installation directions so I shimmed all the way up the wall with 1/4" strips every 2'.
right/wrong?
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August 18, 2010, 08:25 AM
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#8
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Hard Surface Installer
Join Date: May 2006
Location: Idaho
Posts: 2,697
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xoffers said
sorry for late replay, my post got moved. The directions for the Kohler tub have you put 1/4" thick 1.5X4 strips on each stud above the nailing flange of the tub which is about 1/4" thick, this will allow the backer board to sit flush against the tub flange. Problem I'm facing is that the rock board is pitched out at the bottom because of the wood strips, especially where 2 corners meet . This ruins all the square angles for tiling and just looks wrong. I've already found some issues with kohler installation directions so I shimmed all the way up the wall with 1/4" strips every 2'.
right/wrong?
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That sounds like something is haywire for sure. you definitely want things straight and plumb and flush before you tile. How is the board everywhere else? Give us a couple of pics, so we can give more accurate help.
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August 18, 2010, 12:18 PM
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#9
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Tile Expert
Join Date: Mar 2008
Location: NW Arkansas
Posts: 2,361
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From what I'm reading, the flange itself is roughly 1/4" thick, and the instructions are advising you to add 1/4" strips to the studs so that when the CBU is installed, the back side of the CBU will come down over the face of the tub flange.
The only potential problem with that is on your two end walls, the entire wall of the bathroom has to be addressed, not just the part that's inside the tub area. You can always taper it down gradually outside the tub area to minimize that "speed bump".
I had this same problem in my own bathroom where the walls were framed a little too wide for the tub. I added strips and everything turned out okay. Preparation for Tiling a Shower or Tub Surround | Welcome to Trevathan Floorcovering
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August 18, 2010, 04:10 PM
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#10
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One of the Irregulars
Join Date: Aug 2010
Location: Central Vermont
Posts: 12
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Kman said
From what I'm reading, the flange itself is roughly 1/4" thick, and the instructions are advising you to add 1/4" strips to the studs so that when the CBU is installed, the back side of the CBU will come down over the face of the tub flange.
The only potential problem with that is on your two end walls, the entire wall of the bathroom has to be addressed, not just the part that's inside the tub area. You can always taper it down gradually outside the tub area to minimize that "speed bump".
I had this same problem in my own bathroom where the walls were framed a little too wide for the tub. I added strips and everything turned out okay. Preparation for Tiling a Shower or Tub Surround | Welcome to Trevathan Floorcovering
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Kman, found your website after I posted this, excellent job! I ended up doing the exact same thing and it came out nice. Kohler install directions are horrible. Measurements that are supposed to be 2 1/8 got converted to 2 7/8
for cutting drain pipes among others. Thanks for the help
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August 18, 2010, 05:25 PM
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#11
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Hard Surface Installer
Join Date: May 2006
Location: Idaho
Posts: 2,697
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Kman to the rescue 
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