Seems to be gray dirt with black specks coming in from under the wall. This has happened once before. But this time it happened after we had some tuckpointing and bricks replaced on the outside of that wall. The prior time I don't recall anything disturbing that wall. This is obviously an exterior wall and it is above a basement. http://ift.tt/2vpTYMY via /r/DIY http://ift.tt/2v7Ks5A
