The answer to 'asphalt shingles algae growth' is that algae growth on asphalt shingles is a common problem that can cause discoloration and shorten the lifespan of the roof. Algae thrive in warm, moist environments and feed on the limestone filler in asphalt shingles. This can lead to black or green staining that makes the roof appear dirty or unsightly.
The best solution is to have the roof professionally cleaned and treated with a biocide or algaecide to kill the existing algae and prevent future growth. This is generally not a DIY task, as it requires specialized equipment and chemicals to effectively remove the algae without damaging the shingles. If the algae growth is severe or recurring, it may be necessary to replace the affected shingles or consider a different roofing material that is more resistant to algae.