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Old 04-23-2014, 11:03 AM   #1
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Gap at concrete backerboard to tub lip transition


I wasn't sure which forum to post this in, so forgive me if it is in the wrong place...

I am finishing my basement including a full bath, and have run into an issue where my concrete backerboard buts up to my tub lip. I was trying to follow an article from Family Handyman when I installed my tub and backerboard. Unfortunately, I realized that I messed up by not shimming the backerboard out so that it could lay over the tub lip. So, basically, I ended up with the following (essentially I used the 'short lip' method on a 'tall lip' tub):



instead of what is shown at the bottom of this:



So, my questions at this point are:

- What can/should I use to fill in the gap between the back of the tile and the tub lip? Can I just fill it in with extra thinset or grout? Could I use quickset mud? What about the plastic? Will it cause an issue?
- Should I just remove the backerboard, shim, and reinstall? (really don't want to do this unless absolutely necessary)
- Any other options to fix this?

Thanks in advance.

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Old 04-23-2014, 11:08 AM   #2
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Gap at concrete backerboard to tub lip transition


You run a bead of silicone caulk in that gap.

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Old 04-23-2014, 11:14 AM   #3
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Gap at concrete backerboard to tub lip transition


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Originally Posted by Seattle2k View Post
You run a bead of silicone caulk in that gap.
Thanks, Seattle2k. It's a pretty huge gap, though. I'm talking about the gap shown in red below (not the gap between the bottom of tile and the tub). Can I just leave that part empty, and caulk between the tile/tub gap? Will the grout stay between the tiles if there is nothing behind them in that area?

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Old 04-23-2014, 11:28 AM   #4
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Gap at concrete backerboard to tub lip transition


Fill that gap with thinset---then waterproof the wall--of full as you tile if a surface waterproofing will not be used---
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Old 04-23-2014, 11:34 AM   #5
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Gap at concrete backerboard to tub lip transition


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Fill that gap with thinset---then waterproof the wall--of full as you tile if a surface waterproofing will not be used---
Thanks, Mike. So, do you mean to just waterproof the thinset part that I filled in? Or do you mean to waterproof the entire thing? I already have plastic behind the backerboard (I have read that some of you disagree with this, but it is already done now, so...).
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Old 04-23-2014, 01:08 PM   #6
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Gap at concrete backerboard to tub lip transition


As a follow-up question, where would you cut the plastic vapor barrier? And would you do this before or after filling in the thinset?

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Old 04-23-2014, 01:48 PM   #7
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Gap at concrete backerboard to tub lip transition


I would go with 3, and cut before the thinset. The flat/straight edge of the notch trowel is for water proofing, spread the thinset with it over the whole area you are going to tile and then notch. Do a small area at a time until you get use to it. It should say this on the bag of thinset how to use it as water proofing.
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Old 04-23-2014, 02:23 PM   #8
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Gap at concrete backerboard to tub lip transition


Quote:
Originally Posted by ToHellWithUGA View Post
Thanks, Mike. So, do you mean to just waterproof the thinset part that I filled in? Or do you mean to waterproof the entire thing? I already have plastic behind the backerboard (I have read that some of you disagree with this, but it is already done now, so...).
I believe he meant for you to waterproof the whole cement board, but being you have the plastic behind the board, DO NOT waterproof the cement board.

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