What is the minimum allowable thickness for parge coating with Portland cement mortar on a concrete masonry foundation wall?

The minimum allowable thickness for parge coating with Portland cement mortar applied to a concrete masonry foundation wall is 3/8 inch. This specification ensures that the coating provides sufficient coverage and durability to protect the masonry substrate from moisture penetration and other environmental factors. Applying a parge coating that is thicker than the minimum can enhance its performance, but a thickness lower than 3/8 inch may compromise its integrity and functionality.

Consequently, using 3/8 inch as the minimum thickness helps achieve a balance between effective moisture management and structural support while minimizing the possibility of cracking or delamination that can occur with insufficient coverage. The other thickness options, while potentially acceptable in some contexts, do not meet the established minimum requirements for effective parge coating application.