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Old 07-09-2013, 01:18 AM   #1
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Cement board and drywall not plush


Both are 1/2 inch sheets, but the seams where the CBU and drywall meet are not plush. I presume this will be a problem when I start to tile? The drywall seems to be a hair bit thicker than the CBU. Any advice??

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Old 07-09-2013, 06:51 AM   #2
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Cement board and drywall not plush


Sounds like you used Hardibacker---Their 1/2" is not 1/2"---

How bad is it ??Usually the slight difference can be floated with a little extra thinset as you are installing the tile.

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Old 07-09-2013, 11:42 AM   #3
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Cement board and drywall not plush


I actually purposely didn't use Hardibacker because it wasn't a full 1/2 inch in thickness. I used Durock instead. The only area that I'm noticing that it isn't plush is near the window sill. I assume it's because of the corner metal protector that runs along the corners of the sill, but I'm not sure. In the picture below, the area of concern is that one inch piece of greenboard below the window sill. If I were to remove that and just run the CBU up to the sill, what would I use for trim? Can I just buy a piece of window trim and nail it in place? Also, how tight (to the corners) must the CBU be cut when installing it on the walls? Is it okay for their to be a 1/4 inch gap?
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Old 07-09-2013, 08:34 PM   #4
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Cement board and drywall not plush


Get a roll of tilers mesh and use thinset to pack the gaps ---if you are painting on a waterproof membrane like Redguard or Hydro ban--the filling should be done first.

If you are tiling directly over the rock----pack and mesh as you set the tile--this prevents humps or high spots that can result from careless packing ----
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