Which roofing material is prone to issues with algae growth?

Asphalt shingles are particularly prone to issues with algae growth due to their organic materials. Many asphalt shingles contain organic asphalt, which provides nutrients that can foster algae and mold growth, especially in humid or damp environments. Algae can create unsightly dark streaks on the roof and may even lead to deterioration of the shingles over time.

While some types of roofing materials, such as metal and tile, are less susceptible to algae growth due to their composition and design, asphalt shingles lack these protective qualities. Certain manufacturers have begun to treat asphalt shingles with algae-resistant coatings, but it is still a common concern for many standard products in the market.

In contrast, materials like slate and metal do not provide a suitable environment for algae to thrive, making them a better choice for homeowners looking to avoid such issues.