How can I tell if a particular thinset is modified or unmodified? What does "modified" mean?

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).

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