Finish TradesQuestion 274 of 700
In tile setting, ANSI standards distinguish thinset types. A latex/polymer-modified thinset (ANSI A118.4) is generally chosen over unmodified thinset (A118.1) when:
a.The tile is very small and the joints are wide
b.Only a dry, low-stress interior floor is involved
c.Higher bond strength and some flexibility are needed, such as for large tile, some substrates, or wet areas
d.Cost is the only consideration
Explanation
Modified thinset (A118.4) adds bond strength and flexibility, useful for large-format tile, demanding substrates, and wet or exterior settings; unmodified (A118.1) suits basic interior work and is sometimes required under certain membranes. Small tile with wide joints, dry low-stress floors, and cost alone do not drive the modified choice.
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