FAQ
Which thinset is best suited for tiling a shower? 
A polymer modified thinset meeting at least ANSI A118.4, or ideally ANSI A118.15, is best for shower tiles, ensuring proper adhesion with at least 95% contact between the tile and the membrane.
What type of thinset should I use for installing tiles in a wet environment like a shower?
It’s best to use a modified thinset mortar that is waterproof, as it offers superior adhesion and durability for tile installations in wet areas, ensuring a long-lasting bond.
What type of thinset should I choose for tiling a shower?
For shower tiles, modified thinset is recommended, especially with porcelain tiles. You can use unmodified thinset for softer ceramics on a concrete base, but modified is generally more effective.