Couple issues to correct:
1. Board at bottom - if you can slip it out, then do that and put in a full depth board. If you can't, I wouldnt think thats a killer, just put in your sheetrock as a wrap around the interior of the niche. There is little chance of the unsupported back end giving you any problems. Or put another layer of sheetrock/cbu on the back to bring it closer to the board if you feel uncomfortable about the support. Then cover all with Kerdi and Kerdi-fix corners and for double protection coat the seam edges with K-fix also.
2. Looks like drywall mud there. Never to use Drywall mud under Kerdi. Reason is that the water in the mud will help dissolve and dispurse the drywall mud. Making it to some extent useless and likely providing a worse bond. Since its there I would prime it with a premium primer to seal the mud in. But just in areas of mud. No need to prime the rest of the untouched board.
People have asked me to tape the seams of the boards before Kerdi application. I love to ask them if I should use an inferior tape or the best tape available? Drywall tape is just wrong for this use, Kerdi/Kerdiband is waaaaaaaay stronger than any drywall tape, and its what the mfgr recommends.
So no mud in a Kerdi shower.
Quote:
I am basically using this bathroom as practice for future projects
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You're adventurous. the bathroom - shower in particular is the most critical area you can pick for tile installs (save tiling the exterior of a building on the 102nd floor). If you can do a shower right as your first project, it'll be all downhill from there.