Quote:
Originally Posted by GTO
The roof is only 5 years old and one side (half of the roof) is covered in moss.
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I had a moss problem like yours, but a tenant swept it off with a broom.
(Yes, a tenant
). The moss was slowly coming back after three years, although the affected side had been cleared of trees for a new McMansion.
That side faces the warm West sun, and the
very dark color of the original shingles might have encouraged the growth of moss: we are surrounded by all manner of trees.
Our new shingles are a lighter color, though not the white color I specified.

I would've tried Zinc-strips next, but the roof got damaged from windstorm debris this winter.
In the meantime, we'll just wait and watch.