Parge coat

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Parge coat (concrete): A thin coat of a cementitious or polymeric mortar applied to concrete for refinement of the surface. The typical parge coat is 1/32"-1/16" in thickness; this may be less than the minimum thickness allowed by many mortars types.

The intent is to create a contiguous surface by filling surface air voids and bugholes (eliminating bughole-induced outgassing) and to level concrete with extreme rugosity to a level suitable for topcoating with a high-performance protective coating.