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I agree with most of this except for galvanized steel. It doesn't last long enough for a flashing application, plus the installation (drive a nail through it) d

by ars 4y ago

I agree with most of this except for galvanized steel. It doesn't last long enough for a flashing application, plus the installation (drive a nail through it) destroys the zinc coating. Aluminum is most commonly used these days - copper is more rare, and mostly used for looks. > Aluminum branch circuits are currently strongly discouraged. Sort of. Aluminum made before 1975 is not safe, but aluminum wire made after that date is a new allow that is perfectly safe in branch circuits, but no one wants to use it.

philjohn 4y ago
In the UK most flashing tends to be lead - more malleable than copper, and lasts centuries.
- ars 4y ago
  And it also leeches into rainwater, and during installations emits quite a bit of lead into the environment and into the installers. It was a good choice for its time, but it's time to move on.