@Zaku I was referring to what is known as the “leaky jar” effect, where dry leaves or soft foam flakes on top of a building 6–10 stories will cause flooding on the floor in the middle of the height of a building, and thus, leak through the floor into the ceiling beneath it.
I know it doesn’t make a lot of sense, but its kind of like that first time when Legionaire’s Disease first broke out at the American Legion convention in Philadelphia in July 1976, due to water standing in the air conditioner ductwork that was comprised of a certain type of nickle alloy. Regular asprin in the water negated the effect