Hi all

We are going to have a first floor extension put on the house which includes
a new part to the roof. I am thinking about doing something to get rid of
the moss that grows on the existing roof (while the guys are up there) and
to prevent it growing on the new part.

Zinc or Copper ribbon seem to be the thing to use, but will either of these
remove the existing moss over time or am I into a major exercise to clean it
off first and then prevent it growing back?

Also which one, Zinc or Copper, is the most effective and eco friendly

Thanks, Mike