SH-172097 Frequently Asked Questions

Modified thinsets are stronger once cured. Most have additional anti-crack features, and better initial tack/grab (AKA less “slump”). They also are required for use with porcelain and glass tile.

For shower kits, most of the modified thinsets you are looking for are listed as compliant with ANSI 118.4 and ANSI 118.11. Unmodified thinsets will be listed as compliant with ANSI 118.1. Modified thinset is an industry term for any thinset mortar which has additives (usually latex or acrylic).