Come back and fill it with thinset so that it s flush and let it dry.
How to make a tiled wall niche.
Use a tile wet saw that has been fitted with a bullnose blade.
When the framing is all in place attach the niche box to the wall studs using a nail gun.
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The blade will grind down the edge of the tile into a curve that will make the gentle transition to the wall.
Make sure to overlap all seams by 2 inches minimum.
The easiest way to do this is to make a jury stick a 1 by 2 or similarly sized piece of wood marked in increments to show the size of each tile and including an allowance for grout.
I would apply a dab of sealant kerdi fix nobleseal 150 etc in the corners for good measure.
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Learn how to install the niche as you go to make it perfect every time.
Scrape down any high spots in the thinset that has dried from the last step.
A good practice will be to go a couple of feet above the top level of the niche so as to make the wall mortar waterproof.
If there s excess room on the sides of the box you may need to nail 2 x 4 blocks to one or both of the studs on the sides to properly frame the box.
You may need to make a brace or two to support the tile that goes over the top of the niche.
If the niche needs to be tiled then it has to be done tile by tile.
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Then use an angle.
Precut the sheet membrane for the niche.
This ensures any splashing or accidental spraying of water on the wall or shower door does not result in any seepage and water damage behind the tiles.
As you can see in this picture steve is using 12x24 wall tile that s the same thickness as the sill.
Continue on with the wall tiling.
It s better than the tile stick past the niche opening rather than come up short.
Fit the box into the wall.
How to build a large wall to wall recessed niche in a shower.
Apply a thick coat of liquid waterproofing over the entire niche.
Rest the box between the two studs that you cut with the reciprocating saw.
The sill tile should hang outside the niche by 1 16 if you ll be using pencil trim tile to frame the niche.