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A parge coat is a thin coat of a cementitious or polymeric mortar applied to concrete or masonry for refinement of the surface. The typical parge coat is 1/4"-1/2" in thickness; this may be less than the minimum thickness allowed by many mortar types.
Parging is usually applied with a trowel and pressed into the existing surface. The intent is to create a contiguous surface by filling surface air voids and bugholes (eliminating bughole-induced outgassing), to level a surface with extreme rugosity, or to prep a surface for topcoating with a high-performance protective coating.
Parging is a low-cost alternative to repointing, providing structural cohesiveness to masonry walls whose mortar has begun to fail. Parge coating can also be used to create air tightness for apartments.
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