JL wrote:
My 5yr old shed is in a shaded area and is developing moss on roof asphalt
shingles.
Should I worry?
If yes, what's the best way to get rid of it - bleach/water?


Bleach will do the trick, but the runoff may damage painted surfaces
and unpainted wood and nearby landscaping.

On wood surfaces, I use a vinegar/borax solution. It works more
slowly, but does the job, and doesn't harm the wood like chlorine
bleach can. Put some 5% white distilled vinegar into a quart
container (like a juice bottle) and add as much borax as will dissolve.
Then carefully pour the liquid into a hand sprayer, being very careful
not to get any undissolved borax into the sprayer (it will clog the
spray nozzle).

Does anyone know if RoundUp will kill moss?