What is the difference between the ANSI standards? Why do some of the Schluter® mortars have more than one standard on the packaging?

More than one standard may apply to the product.

a. ANSI A118.1 is the American National Standard Specifications for Dry-Set Cement Mortar (unmodified mortar).

b. ANSI A118.4 is the American National Standard Specifications for Modified Dry-Set Cement Mortar (modified mortar).

c. ANSI A118.11 is the American National Standard Specifications for EGP (Exterior Glue Plywood) Latex-Portland Cement Mortar (mortar which will bond to plywood).

d. ANSI A118.15 is the American National Standard Specifications for Improved Modified Dry-Set Cement Mortar (improved modified mortar).

e. The main difference from ANSI A118.4 to A118.15 is an increase in the requirements for bond strengths.

f. “T” is the designation for sag-resistant.

g. “F” is the designation for fast setting.