Moss on roof

Discussion in 'Power Washing' started by Reassurance Property, Jun 5, 2012.

  1. Reassurance Property

    Reassurance Property LawnSite Member
    Posts: 122

    I have a client who has some moss growing on his roof. He has zinc strips up already. It is an asphalt shingled roof. What is the best way to get rid of this and keep it away? (any type of spray) It is a fairly steep pitch as well. Thanks in advance.
     
  2. rlitman

    rlitman LawnSite Bronze Member
    Posts: 1,539

    I just sprayed my garage roof with oxy-clean in water. The moss turned brown in about a week.
    It should start falling off soon.

    The biggest issue is debris on the roof. Are there trees overhanging the roof?
     
  3. Reassurance Property

    Reassurance Property LawnSite Member
    Posts: 122

    Yeah, there is a lot of pine trees (which make moss in the lawn as well). Thanks for the tip. I've heard that dish soap works too but no one I know has ever tried it.
     
  4. Doug Rucker

    Doug Rucker LawnSite Member
    Posts: 105

    Spray it with a mixture of Bleach and Water (at least 50/50 if store bought bleach) and Soap. It will turn white, kill it, and then come off in a few hard rain storms.
     
  5. Reassurance Property

    Reassurance Property LawnSite Member
    Posts: 122

    I'll give it a shot. Thanks
     
  6. Roof Cleaning Virginia

    Roof Cleaning Virginia LawnSite Member
    Posts: 177


    In addition to Doug's suggestion, you can dust the moss with zinc powder too. That'll kill it as well.
     
  7. DavidsonLandscaping

    DavidsonLandscaping LawnSite Senior Member
    Posts: 303

    If your up there, have a safety harness. Very slippery, I almost fell off a triple decker last month doing the same thing.
    Posted via Mobile Device
     
  8. Reassurance Property

    Reassurance Property LawnSite Member
    Posts: 122

    I hear ya there. I think I can get it all from the ladder. I'm not gonna get paid enough to actually get on the roof!!
     
  9. BrettT

    BrettT LawnSite Member
    Posts: 85

    Try using a solid stream nozzle before you clean the roof. It knocks off a good bit of the moss from the gutter line. Some of my customers want instant results and removing some of the moss with a garden hose helps in that respect. It just depends if you priced the extra time into the job.

    Stream Nozzle.jpg
     
  10. rlitman

    rlitman LawnSite Bronze Member
    Posts: 1,539

    I used a tank sprayer with a nozzle like that to apply the oxy-clean to the roof. No ladders, no walking on the roof. Just spray the whole roof until everything was white and foamy, and let it soak in.

    It's been a few weeks, and about half the moss has rolled off in this last rain. It is getting better every day.

    But that was just 5 gallons of water to cover the whole roof of my 2 car garage.
    I'd be wary about using even that sort of sprayer on a hose end. It may not be a pressure washer, but it will still remove more granules and shorten the roof's lifetime.

    Sure, if that's what the customer insists on, and they need it looking clean and new now, what can you do? But they need to understand that anything more powerful than rain will cause deterioration (ok, not as much as the moss does itself, but it is still not a good thing).
     

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