Rationale

Some of the language in Section 7.2.3 related to tight fit joint application is difficult to follow. The intent is to provide information to users that even though mortar is not placed in between units, there may be some incidental mortar present between units due to squeeze out from the setting bed. The section also requires the joint between units to be less than 3/8 in. Changes are proposed to clarify the section, and move the discussion on incidental mortar between the units to a non-mandatory note.