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Yes you can glue the backer to the wall. No matter what you do if the wall shifts there will be issues. Most the time if there is concrete I do not use backer unless there will be a large difference in surface height.
2
Generally speaking, any time you apply a glossy material over a matte material you get darkening. It's unfortunate that this was discovered now, but you do have options.
If you haven't yet sealed the grout, and plan to, see what that does for the situation. Some sealers won't change the color, but some will. Maybe it'll bring things closer to a match.
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2
Linoleum can be a total bear to remove in and of itself. If the substrate is screwed or nailed down then it shouldn't be too bad but if it's glued to the sub-floor then you're gonna have a bad time.
If I had to guess then there might very well be hardwood flooring beneath the linoleum which may have been sanded down to accommodate the linoleum's thickness. ...
1
In some cases I have wanted the tile base lower than the sheetrock. This way there is not a large ledge for water to collect on. You can float some thin set to the surface but make sure it is completely dry prior to tiling and make a large taper or it will be noticeable.
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Use a commercial grout cleaning product or a 50/50 mixture of white vinegar and water. Spray the solution and let it sit for a few minutes then scrub with a sponge or brush. Repeat until the stains are removed. It may take multiple tries.
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The discoloration will never go away on its own. You will need to remove the silicone (difficult, yes...) and use the color matching caulk from the grout manufacturer.
In the future - the color matching caulk should always be used in the corners in place of grout so the two walls are able to move slightly (which they will) without cracking the grout in the ...
1
Shower pan on top of the sub floor works fine. I did this recently and plumbed/installed the pan prior to installing backerboard. I recommend using Georgia pacific denshield board as backer rather than cement backer board. Its reasonably priced and doesn't required a water proofing step. Silicone all edges and bring it down to the shower pan nailing fin lip, ...
1
What about adding 1/4" backer to 1/2" for firmness - Looks like a solution? The tub has been installed so another stud can't be added.
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