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

The minimum allowable thickness for parge coating on a concrete masonry foundation wall is 3/8 inch. This thickness is essential because it provides sufficient coverage to protect the underlying masonry from moisture infiltration and surface damage while allowing for effective adhesion of the parge material. Thinner applications may not provide adequate protection or durability, potentially leading to premature wear or failure of the coating. Moreover, a 3/8 inch thickness strikes a balance between strength and manageability, making it practical for application without risking cracking or peeling. The other thicknesses presented, while they may be used in different applications or contexts, do not meet the standard minimum requirement for effective parge coating on foundation walls.