Home Inspection Flashcard #151

Roof, Asphalt Shingle, Appearance Problems

What's Your Call?

What has caused the brown discoloration visible on this roof?

a. Fastener corrosion.

b. Algae feeding on limestone filler in asphalt.

c. Chemicals used to remove algae.

d. Contamination of the asphalt or granules with ferrous metal.

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