Read FULL ARTICLE here: Removing Roof Moss
There are a bunch of cleaning products for removing roof moss, that allow you to spray and forget. [In fact, I think that is a brand name]
The most effective method I’ve seen for cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. See below.
DIY Roof Moss Remover
If you’re the type of person who like to do things yourself then try this cleaning method. It takes some time to work. The roof moss will loosen over time and may be removed with a leaf blower, remember to direct the blowers airflow down the slope to avoid driving debris under the edges of the shingles.
Here’s how remove roof moss:
Apply with a sprayer and allow the solution to soak in for 15 to 20 minutes
Rinse thoroughly with low pressure water
You may need to reapply and leave on longer but avoid letting the solution dry completely
Remember to protect landscaping below the roof run off and to wear personal protective equipment when working with chlorine bleach.
Never use a pressure washer to clean an asphalt shingle roof as
this will cause granule loss and very likely premature failure of the roof system.
In severe cases, it may take more than one bleach treatment to kill all of the moss.
Preventative Measures to Eradicate Roof Moss
If you want to be more proactive there are some additional things you can do to discourage Moss growth, there are some steps that can be taken to discourage moss and algae growth:
Trim tree branches back to allow more sunlight to reach the roof
Reduce debris accumulation on your roof – I see this a lot on low slope [low pitch] roofs. Leaves and branches tend not to blow off.
Use a a hose or leaf blower to clean the roof, direct the airflow down the slope to avoid driving debris under the edges of the shingles.
Keep gutters clean to promote water drainage.
Do not allow gutters from an upper roof to drain directly on a lower roof; extend the downspout from the upper roof into the lower gutter.
Add zinc or copper strips to prevent both algae and moss, or applying asphalt shingles that incorporate algae resistant copper granules.
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