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Moss is a type of non-vascular plant. Unlike most plants that collect water through their root systems, moss gets its water through its leaves. So, in order for it to survive, it needs a moist environment. In the U.S., moss often grows on roof planes facing North that don’t receive as much direct sunlight, causing them to stay damp longer. Animals and wind can also carry moss spores which easily spread around the neighborhood.

While having a thick, lush layer of moss on your roof may look rustic and cozy, it can harm the elements of a premium roof and shorten its lifespan dramatically. If you notice a lot of moss hanging around atop your home, you’ll want to eliminate it as best you can to avoid requiring a roof tune-up. Here are some ways to remove moss from your home and keep it from coming back.

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Moss lying on the roofHow To Remove Moss From Roof

To avoid re-roofing earlier than you expected, try these methods to keep moss off your roof.

Perform a Scrub

Place a ladder carefully next to the moss growth area. Put on protective equipment like:

  • Old clothing
  • Slip-resistant shoes
  • Eye protection
  • Rubber gloves

You might even want to use safety rope to secure yourself. Hose the area off spraying at a downward angle with plain water.

Use a soft-bristle, long-handled scrub brush to scrub the moss off the roof. Scrub from the top of the roof down so you don’t lift any shingles. Be sure you’re rubbing gently and not scouring, scraping or pounding on your roof. Scrub one small area at a time to prevent cracking, ripping or ripping the shingles.

If scrubbing your roof doesn’t remove the moss effectively, there are a large range of cleaning solutions and do-it-yourself options you can try to eliminate your moss and roof problem.

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Use Dry Moss Killers

You apply the powder by sprinkling it in several lines parallel to your home’s ridge. Space each line around five feet from the next. Once it rains, the rainwater will mix with the dry powder and run down the roof toward the eaves. The moss should be gone after around a week.

Use Liquid Moss Killer

This comes in a container you attach to your garden hose. As the water flows, it mixes on a metered basis. If you have enough water pressure to reach your roof’s ridge, you can apply liquid moss killer from the ground. Since it could be hard to track your progress, you may want to section out segments of your roof mentally and spray each section before you move onto the next one.

Man removing moss from the roofUse Chlorine Bleach and Water

Use a 50/50 mix of liquid chlorine bleach and water to clean moss effectively from your roof. Use a sprayer to apply the solution and let it sit on the surface of your roof for at least 15 minutes before rinsing it off. Use low-pressure water to rinse it off.

While you may need to extend dwell times, don’t let the solution dry completely because this could may make it difficult to rinse the solution off completely. Protect your landscaping and other areas from the solution and wear appropriate protective equipment such as rubber gloves and eye protection.

The moss will start loosening up over time and you can remove it with a leaf blower. It might take a couple of bleach treatments in severe cases to remove all the moss. Don’t use a pressure washer for cleaning an asphalt shingle roof since this can lead to granule loss and premature roof system failure.

If you notice a lot of moss hanging around atop your home this is a potential warning sign, you’ll want to eliminate it as best you can to avoid requiring a roof tune-up

Preventing New Moss Growth

Fortunately, you can take preventative measures to keep moss off your roof. Keep your gutters free from debris, trim any branches that hang over your roof and remove moisture collectors regularly like:

  • Branches
  • Seedpods
  • Leaves

These can pile up on your roof and promote moss growth.

A good long-term solution for preventing moss is attaching zinc-coated metal flashing strips or zinc strips (Z-Stop) right below the roof’s ridge caps or peak. When it rains, the water will flow over the strips and leach out the zinc particles which then attach to the tiles or shingles of your roof and stop new moss growth.

Working smart, safe and strategically can almost guarantee your moss-removal efforts will be effective and taking preventative measures means you can stay off the roof for many seasons to come.

Contact Dominion Roofing for Your Roofing Needs

Dominion Roofing offers a wide range of residential and commercial roofing services throughout Toronto and surrounding areas. From roof tune-ups to re-roofing, we have you covered! Contact us at 416-789-0601 or complete our online form.


How to kill moss on roof?

A layer of green moss might look cozy but it can be bad news for your roof. The following steps can be followed to clean it and prevent it from coming back. Firstly, hose off and brush all moss loose from your roof shingles working one small area at a time then apply a storebought or DIY cleaning solution to remove the moss using a soft-bristle brush .Lastly install Copper or zinc on the roof to prevent future moss growth.

How to get rid of moss on a roof?

Moss can cause roofing to degrade thus the importance to get rid of it. You can physically remove it using a long handled scrub brush without overdoing it. Work down the roof to avoid breaking or lifting shingles. There are several chemicals on the market specifically made to kill moss. Diluted bleach will work well but be sure to wear protective clothing. Lastly install strips of copper or zinc to prevent moss from coming back.

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