Moss naturally grows in moist areas, and can be enhanced by nearby trees which block sun and provide shelter for moss to take hold on your roof. Gotta love the Northwest eh? 40” of Rain + Trees= Moss. Moss, lichen and algae considers gaps between shingles the perfect place to call home. 

​Best case scenario, would be pre-treating to avoid moss all together. A commercial grade moss removal liquid solution will help inhibit moss growth when applied evenly to roof with a sprayer.

Once moss has already grown, it’ll be tricky to remove the moss without damaging the roof. The gentlest option is to spray the moss with the solution and allow it to set in on a few dry days. Then go back and gently broom the moss off. It may take a few treatments to remove the moss entirely and it may never be completely free of all moss. In heavy moss areas, a stronger solution can be applied, but be careful not to mix it to strong if you have plants below where run-off could end up killing your plants.

Another option that would remove the moss all in one go, is to pressure wash the roof. Be sure to hire an experienced roofing and roof cleaning company that will be gentle to limit the damage to the shingles. Any type of pressure wash will reduce the life of the roof as granule loss is not completely avoidable. Be sure to keep moss off the roof once this method is used as you do not want to do multiple pressure wash treatments to one roof.

Neither of these methods is suggested if your roof is already in bad shape. Removing the moss on an old roof could cause leaks and may result in needing an emergency repair. Instead a new roof will need to be installed. 

​Keep your roof cleaned from all debris year around. Remove all debris from roof using a commercial blower and scoop out gutters. Debris and moss can cause water to seep up into shingles and cause roof leaks. Moss traps moisture in your roof, and cause significant damage if not addressed quickly.
 
Mears Roofing can provide these services as needed or on a schedule, please give us a call for an individualized plan based on your roof. It will be helpful to know they type of roof you have, estimated age of roof and past treatments performed. 

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