Moss on shed roof

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?
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JL wrote:

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?
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in my experience, no. Can't tell you why but it does not work for me.
rob
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George.com wrote:

Really? (!) Try hitting it again. RoundUp kills moss for me just fine. It turns it orange/dead in a couple days.
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On Sat, 10 Jun 2006 21:19:04 -0400, JL wrote:

Moss will shorten the life of your roof. I would suggest that you get a zinc strip and install it at the top of the roof line. These strips will last many years, but they can be spendy for a large roof.
There are products that you can sprinkle on the the roof to rid you of the moss. These are safe and work well. They contain iron and zinc and will kill off the moss for now, but dollars to do-nuts, it will be back over time.
Good luck.
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