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I incorrectly tiled my bathroom walls, leaving a 3/8 inch gap between the subway tiles and the shower floor tub. enter image description here

I have purchased some back rod roll to help with caulk fill. Before I put all this together, I have a few questions:

  1. Do i need to prepare anything before I install this rod?
  2. There are two drainage grooves - I have read that tiles are actually not waterproof and they sweat. This sweat drains down behind the tiles and runs along the shower tub lip and out on these grooves. I dont want to jam up anything or restrict water flow with these rods. Should I leave a gap? I'm concerned with a gap that water will get into the drywallenter image description here
  3. I assume I should lay the rod before grouting..? Ot not?
  4. I know I'm an idiot for leaving such a large gap. Actually for following wrong advice, i.e. for drainage - we has really bad mold. Am I good with above approach as I really dont want to pull all the tiles off and reinstall drywall? Any other warnings/advice would be appreciated to make sure this doesn't leak into my lounge below me. enter image description here
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I think the plan is sound. The only think I would change is that I would use Caulk to glue "A" in (to the left site of "A"). This gives you double protection.

This kind of shit happens to everybody, don't worry.

Good Luck

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