Metal Roofing Materials and Wall Systems
 

Algae, Mildew, and Mold Stain Resistant Roofing

algae A typical example of algae staining and discoloration on an asphalt shingle roof.
If you live in a humid climate, you've probably seen the unsightly black staining that often occurs on an asphalt shingle roof after a few years. Unbeknownst to most homeowners, this common staining phenomenon is caused by airborne algae that collect on the roof and then the algae grows in moist areas, producing roofing algae stains that look like black streaks. Since asphalt roofing shingles can absorb moisture and stay damp for extended periods of time, asphalt roofing shingles can create a fertile environment for the growth of these algae stains and other microorganisms.

Metal roofs are very algae-, mildew-, and mold-stain resistant for several reasons. First, the smooth, hard surfaces of a metal roof make it difficult for airborne debris, dust, and plant materials to collect. Also, metal stain resistant roofing materials are water resistant, eliminating the damp, fertile, environment that can lead to algae growth. Finally, metal roofing materials can be thoroughly cleaned without risking damage to the roof. So, in addition to better protection against algae staining, a metal roof is also mold and mildew resistant. Eliminating these unsightly, and sometimes unhealthy algae, mold, and mildew stains from your roof will help ensure your home stays beautiful and maintenance-free for many years.

 

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