Dark streaks on roofs are not only unsightly but can also lead to misconceptions about the condition and longevity of roofing materials. Contrary to common belief, these blemishes are not the result of dirt or grime accumulation but are caused by algae growth. This phenomenon, particularly prevalent on asphalt shingle roofs, is caused by a specific type of algae known as Gloeocapsa magma. This blue-green algae appears black due to its protective UV ray-absorbing layer. Initially manifesting as spots, it gradually evolves into noticeable streaks over several months.
Algae is an airborne organism that flourishes in warm, humid environments, relying on moisture, heat, and nutrients for growth. The spores of Gloeocapsa magma feed off the limestone filler in asphalt shingles, which is abundant in calcium carbonate, a nutrient source for the algae. This makes asphalt roofs particularly susceptible to algae infestation.
While algae presence is mainly an aesthetic issue, it can influence the perceived value of your property. The appearance of dark streaks may raise concerns among potential buyers regarding the necessity for immediate roof replacement. Although algae do not inflict direct damage swiftly, their long-term presence can contribute to the premature degradation of shingles. The protective granules of the shingles can be dislodged over time, exposing the roof to elements and potentially shortening its lifespan.
Removing algae from your roof can enhance its appearance and possibly extend its life. A commonly recommended method involves a 50/50 solution of chlorine bleach and water, applied and rinsed after twenty minutes. This technique, while temporary, can help maintain the cleanliness of your roof for about a year. It is crucial, however, to avoid using high-pressure washers, as they can damage the shingles, causing more harm than benefit.
Advancements in shingle technology have led to the creation of algae-resistant options. These shingles are embedded with metal granules that inhibit algae growth by creating an unfriendly environment for its development. Some products, such as those with StainGuard Time Release Technology by GAF, offer extended warranties against algae growth, reflecting their effectiveness.
An additional preventive measure involves the installation of copper or zinc strips at the roof’s ridge. These metals counteract algae (as well as moss and fungus) by releasing inhibitory substances when washed over by rain. This approach has its limitations in coverage and efficacy over time, as the metal’s effectiveness diminishes with age.
Teflon Roofing, based in Chambersburg PA, is dedicated to ensuring the optimal condition and appearance of your roofing system. Recognizing the unique challenges posed by algae growth, we are committed to providing tailored solutions that align with your roofing needs. From selecting the appropriate algae-resistant shingles to installing preventive metal strips, our approach is comprehensive and focused on maximizing the longevity and aesthetic appeal of your roof.
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