1/9/2024 0 Comments Best moss killer for roofs![]() Keeping branches trimmed back from the roof and removing any debris that begins to accumulate should be part of a regular roof maintenance program. Moss build-up can lead to roof damage or shingle blow -off if left unchecked. Currently, there are asphalt shingles available that use algae resistance technology.Īdding zinc or copper strips to an existing roof is not recommended since this will require either applying the strips with exposed nails (which can cause leaks over time) or breaking the sealant bond (which may eventually result in wind damage) to slide the strips under the shingles.Īlgae and moss growth on roofs, at a minimum, is an unsightly nuisance. Other preventative measures -such as adding zinc or copper strips to prevent both algae and moss, or applying asphalt shingles that incorporate algae resistant copper granules -may be employed when it is time to replace a roof. Do not allow gutters from an upper roof to drain directly on a lower roof extend the downspout from the upper roof into the lower gutter. Keep gutters clean to promote proper water drainage.Air flow should be directed down the slope to avoid driving debris under the edges of the shingles.Debris that does begin to accumulate on the roof should be cleared regularly with a leaf blower or similar, non-abrasive method as part of a regular maintenance program.Trimming tree branches back to allow more sunlight to reach the roof and minimize debris accumulation will provide an environment less inviting for such growth.There are some steps that can be taken to discourage moss and algae growth: Never use a pressure washer to clean an asphalt shingle roof as this w ill cause granule loss and very likely premature failure of the roof system. In severe cases, it may take more than one bleach treatment to kill all of the moss. Moss will loosen over time and may be removed with a leaf blower. Algae will disappear and w ash away with subsequent rains. Use appropriate personal protective equipment when working with chlorine bleach. Take proper precautions to protect landscaping and surrounding areas from the chlorine bleach solution. Extended dwell times may be necessary, however, avoid letting the solution dry completely as this may prevent complete rinsing. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water. The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. In severe cases, moss build-up can cause lateral water movement resulting in moisture damage to the roof deck or may even cause leaks. Moss can cause the leading edges of the shingles to lift or curl, which increases the risk of shingle blow-off during wind events. Unlike algae, moss can be detrimental to asphalt shingle performance. Moss spores may also be carried by wind or animals and can easily spread throughout neighborhoods. Overhanging tree branches provide additional shade and drop debris on the roof that further holds in moisture and acts as a food source for moss. ![]() In North America, moss tends to grow on north facing roof planes that receive less direct sunlight and stay damp longer than south facing planes. Moss must therefore have a moist environment to survive. Moss is a non-vascular plant that obtains water through its leaves, unlike most plants that gather water through its root system. That is why it is important to address an algae problem as soon as possible. On highly reflective or “cool” roofs, algae will undoubtedly have a negative impact on the long-term effectiveness of these roof systems. ![]() There is no scientific evidence that algae is damaging to asphalt shingles, although it certainly affects the aesthetics of a roof. The same is true for apartment or condominium complexes, townhouses or row houses. ![]() That is why it is common to see algae growth on rooftops throughout an affected neighborhood. Algae spores are carried by the wind or by animals and can quickly spread from one rooftop to another. ![]()
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