Critique my Curbless Shower/Bathroom Layout

[Houston Remodeler]

cut the shelf out of one tile diagonally

[grymes56]

So the measurement gods are not in my favor today. The shower seat that is shown above will be covered in a 1.25" thick marble slab that I will have cut after I tile and make a template. That is an old pic where no tile is shown but basically I really want the top of the slab to be 1.5" above the Kerdi due to where my other grout lines line up. I pitched the bench already so I WAS planning on setting the slab right on the kerdi. Now I want to shim it 1/4" all around so that I end up with my magic 1.5" that I want. How can I go about shimming up the whole slab 1/4" and not end up with pooling water? I still need to tile the front edge of the bench with mosaics so if I extend the mosaics up above the kerdi 1/4" I will be creating a 'dam' to hold in water that gets under the slab. Any idears?

[grymes56]

nothin?

[Tiletim]

You already have the slope on the bench so you are good there.

I would cut small pieces of (2x2 squares) of 1/4 Hardi. use them as spacers under the slab set in the thinset The slab won't sink any farther than your spacers

use a 1/2"x1/2" notch trowel - notch the thinset (I would use Laticrete 4 XLT) on the bench mixed semi loose - set in your 2x2 hardi squares the set the stone and tap down to where you want it - clean the front edge and set your face tile.

you won't have standing water under the seat cuz you have the slope built in already. (any water thats gets under the slab will works it's way out through the grout joints)

[grymes56]

lol i wasnt even thinking of setting the slab in thinset...i was going to use lines of silicone running parallel with the slope...

Thinset seems like the better way to go. I cant get 4xlt here easily so I'll probably go with the versabond that I've been using or maybe Custom marble and granite.

[Tiletim]

You want full coverage under you slab - your using emperador right - lots of veining - sillycone is not the right choice under your slab. use thinset

also have the slab guys fab up a shelf for the niche too (may have to be rodded) - same thickness - looks sweet when all tied together