Spray to kill moss on roof8/1/2023 ![]() 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.Ĭhemical treatments work by killing moss that’s beginning to grow on your roof. The final method for preventing moss growth on your roof is regular roof cleaning treatments. Stop moss growth with Chemical Treatments Reducing the moisture on your roof will delay moss growth and help extend your roof life. Second, pruning back your trees will increase your roof’s sunlight exposure, and limit the amount of moisture that’s able to dwell on your roof. If you have any of these trees near your roof line, pruning back branches (especially branches with visible moss) can substantially increase how long it takes for moss to grow on your roof. ![]() First, moss begins to grow on your roof as moss spores land from nearby moss patches, which generally can be found on mature trees. Pruning nearby trees can help you prevent moss from growing on your roof in two ways. Given both the risk and ineffectiveness of this approach, we recommend not installing zinc strips on your roof to prevent moss growth. That means you need to periodically replace your zinc strips, as well as install multiple layers of them on your roof to effectively prevent moss from growing on your roof. Second, zinc strips work for five feet, for five years, according to studies done by the University of Oregon. The Asphalt Roof Manufactures association clearly prohibits the installation of zinc strips to pre-existing roofs as their installation would require breaking the waterproof seal of a properly installed roof. First, they are a leak risk for your roof. However, there are a few main challenges with zinc strips. These work by the strips releasing small amounts of zinc and copper into rainwater that falls on them, which runs downs the roof and deters moss growth. If you had seen the old roof you would have known that it had been torn apart by moss and algae.Ĭhoosing the right roofing type may be an effective but expensive option for homeowners looking to prevent moss from growing on their roof, but what about homeowners with existing roofs? Installing Permanent InhibitorsĪnother way to prevent moss from growing on your roof is by installing copper or zinc strips on your roof. ![]() If you’ve been downtown Vancouver recently may notice that Christ Church Catherdral just put on a new Zinc roof. On the other hand, it’s common in Europe to use Zinc as the primary material in roofing. These roofs do not necessarily repel organic growth, but they don’t provide a porous base for moss to establish itself on. The most common type of metal roofing seen in the lower Mainland are steel roofs, which can be a good option, albeit an expensive one. The first and most expensive option to keeping your roof clear of moss is by choosing a roof type that doesn’t naturally grow moss: metal roofing. We’ll explore four different strategies to help you understand your options, and how you can best prevent moss from growing on your roof. However, the most cost-efficient and overall effective solution to prevent moss from growing on your roof is often a combination of pruning and periodic maintenance cleaning. Moss and algae can be frustrating to deal with, so it’s natural to look for permanent solutions. When homeowners first realize they have a moss problem, they often ask the question “How do I prevent moss growth on my roof?”. How to prevent moss growth on your roof A failure to prevent roof moss
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