Mortar is supposed to be the binding element on a masonry project. But far too often, selecting the proper mortar is a problem between engineers, contractors, and in some cases, producers. The process can become more complicated when it comes to testing on the jobsite.

Fortunately for all parties, there are two key ASTM standards to direct the mortar proportion and production process. Standard Specification of Mortar for Unit Masonry, C 270, provides the guidelines to determine the best mortar for the project. And as construction is about to commence, most job documents call for all parties to follow the specifications outlined in Standard Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry, C 780.