Fungus stain is also called what?

• A. Algae discoloration.
• B. Granules.
• C. Gable.
• D. Flashing.

Answer: (A)

This question tests roofing terminology for staining on shingles caused by organisms. Fungus stain on shingles is commonly called algae discoloration, because the visible discoloration is produced by algae growing on the surface. The term algae discoloration is used in the roofing industry to describe this specific staining, which can resemble dirt but is actually a biological stain from algae. The other options refer to different roof-related concepts: granules are the mineral beads shed from shingles, a gable is the triangular end of a roof, and flashing is the metal or other material used to seal joints and penetrations. So the best choice is algae discoloration.