Home Inspection Flashcard #61

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Roof, Metal Roof

What's Your Call?

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

a. Surface corrosion from long-term exposure to weather.

b. Crevice corrosion caused by stacking panels while they were wet (before installation on the roof).

c. Galvanic corrosion from coating aluminum-core panels with galvanized steel. Where the galvanic coating wears thin, moisture catalyzes corrosion.

d. Surface corrosion from a manufacturing defect that left the galvanization too thin.

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