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I did a noob mistake in my first major DIY project of bathroom remodeling When I installed the cement backer board I left some gap between the cement board and the drywall. On top of that when I installed the tiles I did not go all the way to cover the transition between cement board and the drywall. Now I have this gap with the Schluter transition strip on the bottom, membrane coated cement board on the back and the drywall on the top. Please see the attached picture. Also note the drywall and cement board are not levelled.

The question is how do I fill this gap? Some options that come to my mind are:

  1. Fill it will cement, coat with drywall compound and paper tape and topcoat with drywall compound
  2. Fill it with narrow and skinny(1/4 inch thick?) drywall strips, coat with drywall compound and paper tape and topcoat with drywall compound
  3. Fill it with narrow and skinny(1/4 inch thick?) plywood strips, coat with drywall compound and paper tape and topcoat with drywall compound
  4. Fill it with Hot mud(I have 90 minutes USG), coat with drywall compound and paper tape and topcoat with drywall compound
  5. Fill it with foam backer rod, coat with drywall compound and paper tape and topcoat with drywall compound
  6. Fill it with foam backer rod and caulk.

There could be other options I am not aware of. I am really confused as what I should do.

Please help!!

Thanks backwall

leftwall

rightwall

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  • if you focus your question more it will be better received
    – Ack
    Jan 28, 2021 at 0:38
  • What are your plans for the wall above the tile?
    – JACK
    Jan 28, 2021 at 2:44
  • Seems pretty focused to me: "How do I fill this gap?" followed by a list of possibilities. Could, potentially, be "opinion based", but we've answered similar types of questions before and leave it to the asker to make his own choice after helping to rule out bad ideas.
    – FreeMan
    Jan 28, 2021 at 12:28
  • I've seen metal (likely aluminum or possibly stainless steel) c-channel between tiled and non-tiled surfaces in a bathroom. IIRC, it was usually in hotels, so it probably was a design idea from the start, not an "oops, now what" solution, but it would work. Honestly, my first look at the first pic that's what I thought was there. I had to look hard to realize that was the cement board showing through.
    – FreeMan
    Oct 26, 2021 at 13:58

1 Answer 1

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I just did something similar to your option 3. I used setting compound (Durabond 90) to fill the gap and smooth out it as best as a could. enter image description here

After I got it pretty level I used a layer of paper tape to create a smooth surface, and finished with a small amount of premixed finishing compound then texture in my case.

You can use the Schluter as kind of screed surface after you cover with blue tape. I changed it between each layer to keep the build up of compound minimal.

enter image description here

Since drywall near water is always susceptible I did 2 coats of primer Zins BIN 123

enter image description here

Then 2 coats of a satin

enter image description here

I'll caulk the transition with a thin bead of clear silicone once I finish the floor. If you look closely you can see the wall bends in behind to the Schluter because its not flat but its not as noticeable from far away when finished.

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  • can someone fix my images, the 3rd and 4th images got messed up in the response and I can't figure out how to format them
    – redlude97
    Jan 28, 2021 at 0:10
  • 1
    Done. It's all in the line breaks. Usually, the [1], [2], etc with the actual image links go at the end of the post (that's how the site embeds them), but it seems they can be in the middle, too. Also, a couple of close ups, if you've got them, would help show the details better than the wide-angle shots. Looks good, though!
    – FreeMan
    Jan 28, 2021 at 16:43
  • 1
    thanks! I'll try to grab some later to put in, I didn't take many closeups not expecting to need to answer this exact question for someone else!
    – redlude97
    Jan 28, 2021 at 17:39
  • Who does? Who does...
    – FreeMan
    Jan 28, 2021 at 18:16

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