"Mark" wrote in message
ups.com...
I understand you can install copper wire or flashing near the top of
the roof. The rain water will carry the copper down over the roof and
poison the mold. Anybody every try this? Does it work?

I've used 10-inch wide pure sheet zinc near the roof ridge. Works quite
well, and I understand this is a common approach.
Doubt that wire would work, but sheet copper might, as the brick walks under
my copper gutters' drip line have bare spots where no mold grows.