On Sat, 2 Jul 2011 15:41:34 -0700 (PDT), Joe wrote:

On Jul 2, 9:34*am, woger151 wrote:
What should I use to kill lichen/moss on my roof?

I've seen recs for
(1) household bleach
(2) "oxygen bleach" (whatever that is)
(3) copper compounds (but I haven't really been able to find such
products)

Zinc of some sort has been used for years. Google it.

Copper works too. Often a copper wire is laid gable to gable on either side
of the peak. As you point out, zinc is also used, in strips, along or near the
peak. Zinc is cheaper than copper but, IFAIK, not as effective (requires more
area surfaced in zinc).

http://www.z-stop.com/article.htm