Not drinking,but began seeing pretty colors around streetlights when I licked this off the wall behind that section. Image Insert: 28.51 KB Does it matter that it was daytime? Seriously though,I did find it a strange location for the joint and mold was all over the bottom 18 inches of drywall in the middle of the garden unit. My client is moving to the third floor,but I could not resist entering the open door in the name of looking for the main water shutoff. P.S Les thanks for the link. Scott what about Bob? should have been the standard response I was not sure if that window location was allowed,and how important the expansion joint is at this later stage of construction. That mold is either from an open set of windows during last weeks storm or the lack of expansion joints as far as I can tell.