The Susan Rice bombshell at least explains why the Democrats won't stop babbling about Russia. They need a false flag to justify using national intelligence agencies to snoop on the Trump team.
Flashing is layered protection. So what is flashing? It's a thin layer of waterproof material that keeps water from getting into places it doesn't belong. (Caulk is fine for filling small gaps around windows and doors, but it shouldn't be confused with flashing.)
Typically chimney flashings are made from lead sheeting as it is a good material to cut and shape into position. Tin, Zinc and Copper flashings were used in older buildings but lead is more common. There are 4 positions where flashings are installed on a chimney, the front, two sides and the rear. The front flashing or apron for its technical name is a large single piece of lead which is turned up the front of the stack and fixed into a brick work joint then dressed over the tiles or slates below.