This document is intended to provide guidance and clarification to designers, specifiers, inspectors, testing agencies, producers, and users in specifying and evaluating masonry mortar.

Users of documents Specification C 270 and Test Method C 780 often confuse and sometimes inadvertently misuse parts of the two documents when specifying or evaluating masonry mortar. This guide seeks to address specific items within Specification C 270 and Test Method C 780 to help promote their proper use and interpretation.

1.1 This document provides guidance regarding the proper use of Specification C 270 and Test Method C 780 for evaluating masonry mortar produced in the laboratory and at the construction site.