Sentence:  <WSD>"Parging</WSD>" (a thin coat of cement plaster) may or may not be present on foundation walls. Below grade, it is typically applied to concrete block walls before a bituminous (asphalt-based) dampproofing coating is applied. The <WSD>parging</WSD> is necessary because the surface of the concrete block is too irregular to allow a continuous coating to be achieved with the bituminous material. 
Meaning of the word marked with <WSD> tags:  A coat of cement mortar on the face of rough masonry, the earth side of foundation and basement walls; a parge.