Home Inspection Flashcard #60

Roof, Metal Roof

What's Your Call?

What type of corrosion is this and what would cause it?

a. Crevice corrosion developing from an over-driven fastener.

b. Galvanic corrosion, fastener is different metal from roof steel.

c. Filiform corrosion, developing from micro-cracks at hole drilled for fastener.

d. Surface corrosion developing from moisture trapped against the roof at the time the roof mastic was applied.

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