How to fill tricky seams for shower tile

Hello! I could use some advice on how to properly prep this shower area for tiling. The tricky parts in question are mostly around a window and along the edge of a tub. I had set the concrete backer board for the box around the window, making sure it was level from left to right and the sill was slightly sloped for water run-off. However, when I applied the thinsey to fill seams, it now is not level like I wanted. I am using Mapei Ultraflex 1, but I had difficulty mixing a partial batch at the correct consistency. So I struggled with even application without running/sagging. I plan to mix a new batch much thicker to avoid this for the rest. How should I continue to fill the seams while keeping everything smooth and level for tile install? Specifically, how can I apply thinset on the different planes and get beat edges and corners? I plan to follow up with a few coats of Mapei Aquadefense to seal before applying the tile. submitted by /u/PrimaryWafer3 [link] [comments]

Mar 22, 2025 - 23:08

Hello! I could use some advice on how to properly prep this shower area for tiling. The tricky parts in question are mostly around a window and along the edge of a tub.

I had set the concrete backer board for the box around the window, making sure it was level from left to right and the sill was slightly sloped for water run-off. However, when I applied the thinsey to fill seams, it now is not level like I wanted. I am using Mapei Ultraflex 1, but I had difficulty mixing a partial batch at the correct consistency. So I struggled with even application without running/sagging. I plan to mix a new batch much thicker to avoid this for the rest.

How should I continue to fill the seams while keeping everything smooth and level for tile install? Specifically, how can I apply thinset on the different planes and get beat edges and corners?

I plan to follow up with a few coats of Mapei Aquadefense to seal before applying the tile.

submitted by /u/PrimaryWafer3
[link] [comments]