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When To Put Moss Killer On Roof

Why Does The Time Of Year Affect Moss Killers

How-To: Apply Moss B Ware Moss Kill to a Roof

Summer is the best time to remove moss because its when its actively growing.

This is because the moss is dormant due to the hot weather, which is unsuitable for spore production and germination. In addition, spring has the advantage of being both warm and wet.

The ammoniated soap of fatty acids in moss killers requires enough time and water to be activated and absorbed. Therefore the moss rhizoids can only absorb the chemicals when it rains or when water mixes with the powder. Since spring is a rainy season, the roof is wet for long periods, which helps absorption.

If its not the rainy season, you must spray water on your roof, or the chemical solution will just sit on the roof without being absorbed by the plant.

What if you missed clearing moss in summer? You can still do it in spring since its the second-best season, and moss killers become active and do well on sudden weather changes. Spraying moss killers in October disrupts the survival of moss in the winter.

Remember, not all moss killers are acidic and contain bleach, and can clean your roof without much hassle. A good example is Wet & Forget Moss Multi-Surface Outdoor Cleaner Concentrate, which only requires you to apply and leave it to do the job when it rains.

Heres what you need to know about general timing.

How To Get Moss Off Your Roof


  • A shady climate. The climate doesnt need to be too shady but shade is optimal.
  • Acidic environments. More specifically moss grows optimally at a pH level of 5.0 to 5.5.
  • Moss grows well on hard surfaces.
  • Moss needs a moist/humid environment to grow.
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    Stop Moss Growth With Chemical Treatments

    The final method for preventing moss growth on your roof is regular roof cleaning treatments. Roof cleaning treatments are generally only needed every 4-6 years, and when done correctly can prevent any substantial amount of moss from growing on your roof.

    Chemical treatments work by killing moss thats beginning to grow on your roof. Because it takes multiple years for moss establish itself, these roof cleaning treatments essentially nip in the bud any moss growth. By resetting the moss growth cycle every 4-6 years, homeowners can prevent any substantial or damaging amount of moss from ever growing on their roofs.

    This method is recommending by the Asphalt Roofing Manufacturers Association and is also effective for preventing moss growth on concrete tile and cedar shake roofs.

    No matter what type of roof you have, West Coast Moss Removal has the expertise to help you prevent moss from growing on your roof. We recommend both pruning and periodic roof cleaning treatments and offer both services. Call us today to get your free estimate.

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    Why Kill Moss Early

    Moss doesn’t die back in the winter, but it doesn’t normally release spores during colder weather. Killing it before the warm weather hits means you’re less likely to need to come back later and kill new moss that survived as spores in the dirt. Killing moss by early spring also gives you more time to establish grass or other plants to help keep moss from growing back — it doesn’t grow well when squeezed out by other vegetation.

    Use A Pressure Washer

    Moss Out! 6 lb. Moss Out! for Roofs and Structures

    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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    Why Do I Need A Roof Moss Killer

    With all the adverse consequences of roof moss, you are better off with a roof moss killer. But, I know its not easy to invest in something you probably havent invested in before. So, why do you need a roof moss killer?

    Have you ever had to deal with a leaky roof? If you have, then you know how infuriating it can get. And since you may not want to experience this again, you should get a roof moss killer. It will keep your roof moss free for some time, protecting the shingles and the entire roof from damage that may cause leakage.

    A moss-covered roof looks like its straight from a fairy tale-its aesthetically pleasing. So, I imagine that you may want your roof to look beautiful and new after removing the moss. Using a roof moss killer not only removes and kills the moss but also leaves your roof with its original shine and visual appeal.

    You may also want to get a roof moss killer to avoid the massive costs and resources associated with a roof replacement. If left unchecked, moss can cause irreparable damage to your roof. But a roof moss killer will help you to de-moss your roof early on before your roof reaches the point of no return.

    Lastly, a roof moss killer will protect you and your loved ones from moss-related allergic reactions. Moss releases toxic compounds into the air, which may cause allergies.

    To 3 Cups Chlorine Bleach + 2 Gallons Of Water

    You can also make chlorine bleach for roofs, but it is important to use the correct dilution and to test on a small area first. Also, when using chlorine bleach, always wear protective clothing.



  • Take between 1 ½ and 3 ½ cups of chlorine bleach and mix with 2 gallons of water in a large bucket.
  • Ensure you dilute the chlorine with water to prevent it from harming your roof shingles.
  • Wear your gloves to protect your hands from the chlorine bleach.
  • Pour the mixed solution into the garden sprayer.
  • Climb the roof with your ladder.
  • Sprayer or shower the solution on the growing moss on your roof.
  • Wait for 20 minutes and then rinse with plain water.
  • Check to confirm if all the moss has been removed.
  • Spray the solution again if theres some moss remaining.
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    Make Your Own Bleach And Water Solution

    This 50/50 combination effectively kills mossand every other plant it toucheson your roof and in your gutters. If the moss on your roof is still a thin layer, you may be able to use this solution to remove it without scrubbing. If not, though, it is still important to kill spores that have moved onto new places on your roof. For a natural mixture, substitute vinegar for bleach.

    Because this solution can kill other plants and damage some housing materials, you will need to protect the ground below from run-off. You can wet plants to help protect them, or use disposable plastic drop cloths to cover the landscaping and walkways.

    Baking Soda

    In addition to a vinegar-water solution, you can also use baking soda as an all-natural alternative. Mix 3 tablespoons of baking soda per one liter of water and spray it on your roof when the forecast is calling for dry, warm weather. After a few days, the moss should be dried up and can be brushed off.

    How Laundry Detergent Destroys Your Roof

    How to get rid of Moss on Roof

    The shingles on your roof are made of a fiberglass mat. On both sides are asphalt, tar, and oil that protect the fiberglass from the outside elements: wind, sun, water, etc. The life of your roof depends upon maintaining that asphalt, tar and oil. These are the very things that moss breaks down and destroys, which is obviously why you want to remove moss in the first place.

    What is detergent? Its a degreaser. Guess what a degreaser does to your shingles? Thats right. It breaks down and strips away the asphalt, tar and oil protecting the fiberglass mat.

    Using laundry detergent to kill the moss on your roof only made your problem worse. Instead of eliminating the central problem , detergent actually causes even greater erosion. Dumping detergent on your roof can effectively shorten the lifespan of your roof by half.

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    How To Remove Moss On Your Outdoor Surfaces

    Unwanted green moss growth on your roof is an eyesore. Did you know it can also cause expensive damage to your roof over time?

    Continue reading to learn why moss is prone to growing on your homes exterior surfaces and how you can remove stubborn moss with the easy-to-use Wet & Forget Outdoor cleaning products!

    What is moss, and where does it grow?

    Moss is a velvety, green plant that doesnt have flowers, roots, or stems. It attaches to surfaces and absorbs water.

    Moss grows easily in humid areas that provide a moist environment for it to survive. Moss doesnt require a ton of shade to grow, but shaded areas are ideal for growth.

    There are roughly 10,000 different species of moss worldwide.

    Will it harm the outside of my home?

    Moss can cause serious damage to your homes exterior surfaces, especially if you have it growing on your roof. Roofing experts recommend that you take action to control moss as soon as you see it appear on your roof.

    Its important to treat and remove moss right away, so you can stop it from spreading further.

    Moss can destroy your roofs shingles and force them to lift away from the roof. Without the shingles in place, your home will be susceptible to water damage.

    A damaged roof, along with water damage, can lead to some pretty expensive repairs. Moss retains moisture and holds it up against your roof, which can cause rotting.

    Moss has root-like structures called rhizoids that can burrow into your shingles and cause pitting.

    How can I remove moss?

    Use Homemade Moss Removal Recipes

    If you are looking for a cheap but chemical-based alternative, then the homemade moss removal recipes are your best bet. One of the simplest recipes is mixing two gallons of water with approximately 8 ounces of dawn ultra-soap.

    Proceed to put this mixture in your garden sprayer and spray on the roof moss-infested area. Allow about 20 minutes for the mixture to kill the moss, then rinse off your roof with clean water.

    The second simplest is using vinegar and water in a garden sprayer. After spraying the roof, wait for about half an hour, confirm that all moss is dead, rinse off the roof, and then remove the dead moss.

    A more complex homemade recipe involves powdered oxygen bleach and water. Mix a pound of powdered oxygen bleach with two gallons of water, pour it into your garden hose, and spray the roof.

    Wait for about 20-30 minutes for the product to work, then rinse the roof and rid it of the dead moss. You can also use chlorine bleach and water.

    Mix two cups of diluted chlorine bleach with two gallons of water and put the mixture in your garden hose. Spray on roof moss-infested area, allow twenty minutes, and rinse with plain water. When using this mixture, its important to have gloves on to protect your hands.

    Note: Use diluted chlorine bleach as concentrated bleach may corrode shingles.

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    How Does Moss Affect Your Roof

    Whats wrong with a little moss on my roof? Its giving my home that visually pleasing look. If your line of thought falls in these categories, its about time you learned how moss affects your roof. As I mentioned earlier, moss left unchecked damages and threatened the structural integrity of your roof. How?

    Moss strips your shingles off their protective oils, leaving them susceptible to corrosion and damage. If your roof has moss, it will likely warp and crack in the sun. As a result, you may find that its lifespan is shortened by half. Moss will also ruin your shingles by damaging their outer protective layer.

    Its absorbent nature causes it to suck up moisture like a sponge. This provides the optimal environment for its growth and spread on your roof, eventually damaging the outer protective layer.

    Moss will also lift and loosen your roof shingles as it grows in the cracks between them. Soon after, the moisture buildup from the absorbent moss will cause wood rot.

    If you fail to discover this problem early on, your roof may start leaking, and you will have to conduct extensive and expensive repairs to get your home back in shape.

    And because it doesnt hurt to step away from the roof, you need to know that roof moss can attract pests. The moisture buildup provides a habitable environment for mosquitoes, ticks, fleas, and fireflies.

    Lilly Miller Moss Out Lawn Granules

    Lilly Miller MOSS OUT! Roof Moss &  Algae Killer

    We all love a lazy liquid roof moss killer approach. But faced with a potent, budget-friendly granular killer like the Lilly Miller Moss Out, you wouldnt resist.

    With 32 percent ferrous sulfate monohydrate and 68 percent calcium carbonate, this product will instantly kill your moss. You will also enjoy a large area coverage of up to 5000 sq. ft. The price is also quite friendly, making this granular product the epitome of great value.

    However, its granular nature may be painful, especially when spreading the granules. I recommend using a seed spreader to spread the granules evenly on your roof moss.

    The product may also burn when it contacts your skin. Unfortunately, there are no warnings on the product packaging. So to be on the safe side, ensure you have a good eye and skin protection.


    • It may be slightly difficult to spread the granules
    • It may burn when it comes into contact with skin

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    Why Is Moss Bad For My Roof

    Although most mosses pose no danger to humans, moss growth can severely compromise your roof. Moss is incredibly effective at absorbing moisture, which means that any moisture trying to leave your roof will be captured. Moss is also very likely to grow in between roof tiles, filling up the voids between them which can lift the tiles and expose what lies underneath to the elements. This combination of excessive moisture and exposure to rainwater is what leads to serious structural damage such as rotting timber or damp insulation.

    The Difference Between Moss Treatment And Moss Removal

    It’s ideal to treat and remove moss as it is growing and thriving . If you treat your roof once a year, moss won’t grow beyond the point of routine maintenance. As a rule of thumb, seeing a tint of green on your roof means the moss is outgrowing the maintenance phase, and you may need a restoration plan to completely clear it off. The difference between restoration and maintenance as it relates to moss is whether youre treating the moss or removing it it’s also the factor that determines if you can do it yourself.

    Moss treatment means killing the moss, which begins at the time of treatment. Moss treatment is the process of applying a solution that will kill moss over timetypically five to six weeks. When performed at regular intervals, moss treatment prevents moss growth, which often eliminates the need for moss removal. Think of it as you think about changing your car’s oil versus having to replace the engine.

    Moss removal clears the moss at the time of service, by scraping the shingles. This will need to be followed with a moss treatment to prevent future growth. Today we are going to do both moss removal and moss treatment. We’d like to note that DAPrDAN doesn’t offer moss removal as a service, but we’re happy to recommend other vendors if you contact us at

    One big thing to avoid: Dont use pressure washers on your roof. If you do, you’ll strip away the layer of sand and grit, which offers traction and is the protective layer of your roof.

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    Can I Scrape The Moss Off My Roof

    Yes! You can scrape it off with your hands or use an old toothbrush. Weed-eater attachments are also helpful for removing moss from larger areas on your roof.

    For smaller patches of moss

    Mix 1 cup of bleach in 2 gallons of water and spray it over the area with a hose before scrubbing away the dead algae growth using steel wool or an old toothbrush.

    If youre concerned about the roofs appearance after removing moss, consider restoring it with a pressure washer.

    It can also be helpful to hire an experienced professional to look at your roof and assess any damage or safety concerns.

    This will ensure that your property meets specific standards before selling or refinancing your home.

    For larger projects, hiring professionals is more cost-effective than doing it yourself.

    However, if you would prefer to take on the job yourself, then you should know that there are several ways in which you can clean off moss from your roof:

    · Use bleach and water

    · Use an attachment for a weed-eater

    · Scrape it off by hand or use an old toothbrush

    Use steel wool or an old toothbrush rather than a power equipment attachment, such as one for a weed-eater if the roof has already sustained damage.

    For small patches of moss, its fine to scrub the area with bleach and water using your hands or an old toothbrush.

    However, if youre having trouble removing it all,

    Then you can always try using a pressure washer and cleaning solution instead of simply wetting and brushing away the dead algae growth

    Falling Leaves And Other Debris

    How to Remove Moss from Your Roof – Step by Step Guide

    If you often notice leaves or other debris from trees accumulating on your roof, you may want to think about more frequent roof cleanings. Heres why:

    When leaves cover your roof, they also trap moisture, which makes it easier for moss, fungi, and bacteria to grow, which can also cause the development of leaks. As we know, excess moisture equals bad news for roofs in the Pacific Northwest!

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