Moss on your roof can be an eyesore. Any homeowner who has been unfortunate enough to have this problem can attest to that. But your primary concern should be the durability of your roof. The growth of moss can put a serious dent in its lifespan. And that’s because when moss grows, it can lift shingles up, which allows water to slip under to your roof deck causing leaks and more importantly rotting. With that in mind when moss is spotted on your roof, you should make all attempts to remove it swiftly. But before you remove moss you need to know two key things about it. First, it enjoys living in a pH of 5.0-5.5 and second it obtains water through its leaves, which is why it requires moist conditions to live. Remove those two settings and your moss colony will quickly die. Most over the counter solutions used to combat moss growth work by changing the pH of the area it’s applied to. But it is possible to create homemade solutions that will achieve the same effect. As a tip, you should wait until there’s an overcast day before attempting to remove the moss from your roof. That’s because on a sunny day your solution will dry too quickly, which can reduce its effectiveness. If you choose to go the route of over the counter products, then use cleansers like Spray & Forget, Wet and forget, Roof Wash, or Bayer 2-in-1 Moss and Algae Killer. You should follow the instructions that come with these products when applying these solutions to your roof. Should you opt for the alternative, homemade solutions can be made using:

  • 8 ounces Dawn Ultra dish soap for every 2 gallons of water
  • 1 pound powdered oxygen bleach for every 2 gallons of water
  • 1½ to 3½ cups chlorine bleach for every 2 gallons of water
  • 1½ to 3½ cups white distilled vinegarfor every 2 gallons of water

Once you’ve made your solution your next step will be to hose down your roof with plain water. Do not user a pressure washer! Using a pressure washer will result in your asphalt shingle granules being washed away with the force of the water, which will allow water to penetrate to your roof deck below. Bleach solution is notorious for destroying surfaces, so as a precaution you should cover the surrounding area. Apply the solution with a sprayer and allow the solution to sit for 15-20 minutes. Do not allow the solution to completely dry as this can reduce its effectiveness. Lightly scrub with a soft bristle brush. Next use a hose to rinse your roof and your cleansing process is just about over. You can go a step further and reduce the reoccurrence of moss by removing any structures that might be creating a humid, moist environment for the moss to live in. Trim or remove trees that are preventing sunlight from reaching your roof.  Install copper and zinc strips to each end of your ridge. It’s also advised that you clear debris from your roof regularly.