Little problem with my new shower niche

[garbadgecat]

Hi all long time lurker first time poster thanks in advance for the help

Here is my problem. I have a shower niche in my new shower. It is 1/2" too wide after I installed the CBU (easyboard) and applied 2 layers of RedGuard (reinforced with fiberglass mesh tape). The problem is I built it for a different sized tile then we decided to use. (well i did not decide this :-)

The tile we are using are now using is too small to fill the opening. I need to "make up" exactly 1/2".

My plan is to use 2 pieces (one on either side of the niche) of 1/4" hardie backer I have form the flooring project and thinset those to the existing redguarded niche walls then thin set the tile to the hardiebacker. does anyone see a problem with this, should I instead screw the hardiebacker in and "re-redguard" the sides. I would like to avoid this so as not to cause a vapor barrier sandwich.

THanks
Charlie

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[bbcamp]

Use a modified thinset to "glue" the Hardibacker to the sides. To ensure a tight fit, use lengths of wood to wedge the pieces tight against the walls. No need to Redgard these filler pieces.

[Deckert]

1/4" each side?

I'd skip the strips of backer and just skim 1/4" of thinset on each side.

[HS345]

Either Bob, or Brannigan's suggestion will work. If you use thinset only, make sure it's mixed a little on the thick side.:)

[John Bridge]

Hi Charlie,

I vote for the Hardi-backer idea. :)

[cx]

I'd vote for the Hardibacker, too, but I'd recommend you RedGard it again,
specially the edges.

My opinion; worth price charged.

[Crestone Tile]

I'm wondering if he didn't do this already (whatever he decided) since it's been over two months since?