You would think that with a name like flashing, the term would refer to something with a little sparkle and pizzazz. Well, we guess sheet metal can put off a little shimmer, and that is exactly what most flashing is made of. The point of flashing is to stop water from penetrating and, consequently, damaging a structure at its seams and joints – i.e., where different materials come together, such as where a chimney emerges from a roof or where a window sits in a wall. That said, flashing needs to be composed of material that itself is impervious to water. Whether exposed to the elements or concealed within structure and whether made of rigid metal or flexible sheeting, flashing needs to be non-corrosive, long-lasting, and prevalent or the building’s occupants are in for lots of grief.