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How Do You Get Rid Of Moss On A Roof

How Do Zinc Or Copper Strips Work

How To Remove Roof Moss – And Keep It Away

They are fitted at the top of the roof, and when it rains, the rain absorbs metal particles from the metal strip and carries them down over the moss as the rain runs down the roof. The metal particles poison the moss, algae and other plant life growing on your roof, and so the moss will wither and die over time, falling off your roof. It will also mean that new moss and algae will not grow due to the poisonous particles that are deposited over your roof from the zinc strips.

How To Use Moss Removal Chemicals

Before you apply the chemicals, you must remove most of the moss first using a brush or trowel as aforementioned. Then place covers over any plants, patios or furniture the chemicals used to treat moss and fungi are very strong and poisonous to plant life so its important to try to prevent it from spreading or coming into contact with other surfaces. The best way to apply the chemical is by using a sprayer, as long as you ensure it does not come into contact with other surfaces. Apply as per the instructions on the package, and then leave to dry. Some chemicals require you to wash off any excess after, but be aware of the potential risks involved when the water drains off. The benefit of using a chemical is that it will prevent moss from growing for longer than just removing it by hand. Take a look at our range of moss removal products.

Understand Roof Moss And Damage

Cracks and crevices between roof shingles provide ideal spots for moss to grow and spread. These simple plants flourish wherever moisture collects, particularly on north-facing or tree-shaded roofs. Moss doesn’t need much light or nutrition, but moisture is crucial. In humid areas prone to foggy mornings and moderate winters, a slight dusting of moss can escalate to a serious roof problem.

Left unchecked, roof moss grows into a thick, resilient layer. Established moss acts like a sponge, soaking in moisture from below and above, and keeping your roof constantly moist. Moss creeps under shingle edges as it spreads, prying shingles loose and letting damaging moisture reach the layers below. Damage progresses from shingles to rotten underlayments and damaged framework. Health-threatening mold can develop and travel down walls to affect living areas as well.

Untreated moss gains a foothold in crevices and cracks as it spreads.

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How To Prevent Moss On Roof

Happily, there are preventive measures you can use to keep your roof moss-free. First, let the sunshine in! Trim branches overhanging your roof, keep gutters free of debris, and regularly remove moisture collectors, such as leaves, branches, and seedpods, that pile up on the roof and encourage moss to grow. The best long-term solution? Attach strips of zinc or zinc-coated metal flashing strips just below a roof’s peak or ridge caps. When it rains, water flows over the metal strips leaching out moss-retardant zinc particles, which attach to roof shingles and/or tiles to stop new moss from forming.

Working safe, smart, and strategically guarantees your moss-removal operations will run smoothly. These prevention measures mean you’ll be able to stay off the ladder and roof for seasons, if not years, to come.

What If The Moss Appears Dead


If the weather has been consistently dry, moss may appear to be dead. However, some species of moss can stay alive when dried out for months. All it will take is one rain for it to recover and continue growing. If your moss has dried out, take the opportunity to have a roofer remove the moss from the roof.

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How To Fit Zinc Or Copper Strips

Zinc or copper strips should be fitted under the shingles that cap the roof ridge, with at least an inch or two exposed below. Remember that before you fit the metal strips you should remove any existing moss or algae growth you can do this with a stiff brush, or alternatively purchase a moss-removing chemical, but if you arent confident in going up onto the roof, ask a professional. Its important not to use a pressure washer to remove the moss because it can damage the roof shingles.

Use A Pressure Washer

A pressure washer isnt a great way to prevent moss growth, but it is an excellent solution for killing moss. It is perfect for moss with a shallow root, so areas with a couple of inches on a hard surfacesuch as sidewalks, pavers, or concrete.

This is not the best option for roofs or lawns, as the pressure that loosens the moss can also break off other materials that you want to stay in place. Pressure washers can come in handy around the house and work well with vinyl siding wash, too.

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How Much Does It Cost To Remove Moss From My Roof

If you do it yourself, the materials you need to remove moss from your roof are inexpensive.

All you need is a ladder, garden hose, spray bottle, and chlorine bleach. Most homeowners already have those supplies.

If the moss is thick and well established on your roof, like the photo below, you should hire a professional.

The cost depends on the size of your roof, the amount of moss, and the labor rates in your area.

According to AngiesList.com, roof cleaning can cost between $250 and $1000, with an average cost of $550.

As a rule of thumb, professionally removing moss will cost about 5% of what it would take to replace your roof altogether.

Price Moss Removal And Cleaning Roof

How to get rid of Moss on Roof

A normal roof moss removal costs £7.5 to £12.5 per square metre. If you want to protect your roof better against weather conditions, you can have a coating applied as well. The price for cleaning and coating roofs is about 25.5 pounds per m². The exact price depends, among others, on the type of roofing and the possible use of scaffolding. Comparing prices becomes very easy thanks to our online quotation service, where you can request customized prices from professional roof cleaners.

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How Do I Apply Moss Remover

Firstly, you should only apply roof cleaning or sealing products on a clear, but cool day with little wind. This is because excessive heat can cause the solution to evaporate too quickly to have an effect, and wind can blow it off your roof tiles. You should also take care to protect any plant life nearby from the chemicals using plastic sheeting, and hose them down afterwards to ensure no damage.

To apply the moss remover, work backwards on your roof applying a gentle coat using your garden sprayer. This is not only the most efficient way to work, but youll also be keeping yourself safe by never stepping onto a wet, slippery tile. Once this initial coat has been applied, simply wait for it to dry and then gently brush away any remaining debris.

Tips For Installing Zinc Or Copper Strips

When installing the metal strip its crucial that you do not use nails to hold it in place this will cause leakage when rain drips down along the nail and through the roof structure. Its also essential to ensure the zinc or copper strips are lying thin and as close to the roof as possible, to prevent warping. When warping occurs, the area of the roof beneath it does not get treated by the strips because instead of running directly down the roof, it runs along the strip to a less warped area.

Whichever method you choose, its important to look at other factors that cause moss growth and try to remove these. For example, trimming overhanging trees and bushes will remove shade which moss needs to grow, and moving any satellite dishes to areas that wont create shade. The more sunlight your roof is exposed to, the less shade and moisture will be present, so the less likely moss is going to grow.

Dont forget, for any roofing queries, questions or products our experts are here to help just give us a call on 01752 692 760.

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Getting Rid Of The Moss

The first step to beating moss on roof tiles is to get rid of any moss that has already accumulated on the roof. This is quite simple and can be achieved using a long-handled brush to dislodge it. Be careful not to be too forceful on the tiles in case you damage them. You can also use a small trowel to do the same job if you are confident about climbing further onto the roof and have the right equipment to do this.

After this, use a biodegradable soap moss remover that can be sprayed straight onto the moss on roof. Leave for a short time then remove following the manufacturers instructions. Another option is a specialty moss-killing product Cromar Moss & Mould Remover that doesnt just work on roofs but also removes the stuff from paths, patios, driveways and even fences. The advantage with the latter is that it kills off the spores of moss that hide in the cracks between tiles and can be a basis for another covering of moss on roof tiles in a short time.

Another simple roof moss killer idea makes use of an everyday household item: washing powder with bleach in it. Simply sprinkle the powder onto the area where the moss is present and dampen with a gentle spray from the hosepipe or from a watering can. Leave it for around 10-15 minutes then hose again thoroughly to remove the moss and the powder.

Do Dethatching Rakes Work

Getting Rid Of Moss

Dethatching rakes are good for light thatch and general thatch maintenance on small lawn areas. Power rakes are mower-like devices with rotating, rake-like tines that dig into thatch at the soil level and pull it up. Power rakes work well for lawns with thinner thatch layers and grass that can withstand intense raking.

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To 3 Cups Distilled Vinegar + 2 Gallons Of Water

Distilled vinegar mixed with water is a safe and easier way of eliminating moss growing on your roof. Unlike chlorine bleach which may damage your roof shingles over time, vinegar is quite safe. Below is how to use this homemade moss killer for roof recipes.


  • Ladder


  • Take between 1 ½ and 3 ½ cups of distilled vinegar, depending on how much moss has grown on your roof.
  • Mix the vinegar with 2 gallons of water in a large bucket.
  • Pour the solution into the garden sprayer and climb the roof with your ladder.
  • Check everywhere the moss is growing and spray the solution.
  • Wait between 15 and 20 minutes for the moss to soak in the solution.
  • Rinse thoroughly with plain water.
  • Will Grass Regrow After Raking Out Moss

    In this case, no matter how often you remove moss, it will keep coming back unless you can raise the pH. Johnsons Lawn Seeds After Moss is coated in calcium carbonate which raises the pH of the soil for you. To start, simply disturb the surface of the soil with a rake, removing any stones and debris.

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    Guide For Algae & Moss Removal On Your Roof

    If you live in the South, Midwest, or another region of the country that has warm, humid summers, you may have noticed stains and streaks showing up on your asphalt shingles. These stains look a lot like moldbut in fact, much of this so-called mold is actually blue-green algae . In some cases, what looks like mold might be more properly classified as moss.

    In less frequent instances, the streaks on the roof actually are mold, which can be very dangerous for your family and more difficult to get rid of. The most serious mold cases can cause asthma, headaches, and other health problems, so its crucial to understand the difference.

    Why Is Moss Bad For Shingles

    How to remove moss from a roof 🙂

    You may feel that a bit of moss gives your roof some charm, just as ivy growing up the side of your house might. While moss may be beautiful, it is a detriment to your roof. Heres why:

    Most plants gather water from their roots, but mosses gather water from their leaves. Therefore, they do not mind that shingles, unlike soil, are a dry and relatively nutrient-free environment. They will grow roots directly into the shingles, which can destroy the shingles and create the opportunity for leaks.

    When it rains, moss will soak up water and retain it, creating consistently wet conditions on your roof. Moss growth will also interfere with proper drainage of water off the roof as water needs to trickle through or around the moss instead of running straight down to the gutters. The resulting constant exposure to water can degrade shingles.

    Over time, moss can also work its way under shingles, lifting them up. This uplift creates opportunities for water to penetrate lower layers of the roof and, potentially, your home.

    While minor moss infections may not cause many issues, it is likely to become severe over time. Once you spot moss growth on your roof, you should take steps to resolve it. If you have a severe infection, you may have no choice but to remove the shingles that have been damaged by it. A professional roofer can help you assess what kind of intervention your roof needs.

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    First Off What Is Moss

    Mosses are a collection of tiny non-vascular flowerless plants that thrive in damp or shady conditions. Unbeknownst to many, there are seven classes and 12,000 known varieties of moss worldwide. It’s non-vascular, which means that moss doesn’t have roots like other plants do, and instead absorbs water from its appendages or spores. Because it doesn’t have the root structure to grow upward, it’s a plant that grows low and spreads wide on flat surfaces.

    When moss spreads, it can envelop the surface and create a somewhat rustic look for cottages or cabins, which is why some people choose to let moss grow on their roofs. However, the consequences of allowing moss to grow wild are often not worth it.

    Do Not Use A Pressure Washer To Remove Moss From Your Roof

    When I noticed moss on my roof, my first instinct was to rent a pressure washer and blast it away.

    After a few minutes of research, I quickly learned that you should never use a pressure washer to remove moss or anything else from your roof.

    High water pressure can damage your roof by lifting and loosening shingles and washing away the granules, which are the tiny pebbles on each shingle.

    Maintaining granules is important because, according to NolandsRoofing.com, they make shingles sturdier and fire-resistant and protect the asphalt coating from UV rays.

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    Stop Roof Algae From Coming Back

    To keep the algae from coming back, insert 6-inch-wide strips of zinc or copper under the row of shingling closest to the roof peak, leaving an inch or two of the lower edge exposed to the weather. That way whenever it rains, some of the metal molecules will wash down the roof and kill any algae trying to regain a foothold on your shingles.

    You can probably see this same principle working on roofs in your neighborhood. Look for chimneys with copper flashing the areas directly below the flashing will be free of any algae stains.

    The strips also work on roofs suffering from moss buildup. Just scrub it off first with a brush, then bleach as above.

    Need help with home maintenance? Read our reviews on home warranty providers.

    How To Remove Moss From A Flat Roof

    How Does Moss Grow on Your Roof?
    • Written by Justin Stewart on Dec 16, 2009To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience.Reviewed by

    Removing moss and algae from a flat roof can seem like a never-ending task. Most homeowners will have noticed that their flat roof is regularly invaded by the green pest, and while it does no damage to flat roofing materials, it can retain moisture, which will accelerate wear and tear on the flat roof. It also doesnt look very nice.

    Moss on Roofs

    A flat roof of any kind of material can become a host to moss. While it does not directly damage the building, unlike termites, for example, it can shorten the life of wood, metal, asphalt, concrete or clay roofs, simply by encouraging water to stick around in its shallow root system. Moisture promotes wood rot and concrete decay, will erode asphalt in shingles, and can cause staining and buckling in a metal flat roof.

    Moss is attracted to northern sides of buildings, where moisture stays for longer they are also prone to grow near large trees, that produce shade, and morning dew, or rainfall which does not move away quickly will also attract moss.

    Getting Rid of Moss

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    Another Less Common Occurrence Is Moss

    If you see green fuzzy stuff on your roof it is most likely moss. Moss loves cool, damp environments. If you have moss on your roof it will be commonly found on the North slopes in addition to overhanging treses or overhanging sections of the roof causing shade and allowing moisture to hang around and the moss to grow.

    Moss spores can become airborne and make their way onto roofs via wind, birds, squirrels, and other small animals, in the same way that algae makes its way to your roof.

    Once the moss spores land on a roof, they will gather in the spaces between shingles and eventually grow into thick spongy moss.

    Algae is a term for a large group of photosynthetic eukaryotic organisms. They are typically aquatic and lack the roots, stems, and leaves of other plants, though they still contain chlorophyllthe green pigments found in most plants. However, they are not plants but rather organisms also spread by spores, much like moss.

    Mold is the result of algae left too long on a roof. Algae needs perpetual moisture to exist, so they grow best in humid areas. When algae keeps the roof damp for long enough, rot can set in, commonly leading to mold growing and spreading.


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