Home Inspection Flashcard #180

Roof, Vents

What's Your Call?

What does the white staining below the vent of this two-story house imply?

a. Electrolysis de-zincification of the low-quality galvanized vent is occurring (notice the difference in color compared to other vents).

b. The asphalt shingles have a fairly uniform coating of algae.

c. A white sealant applied to help prevent roof leakage is being dissolved by roof drainage.

d. There is a moisture problem caused by combustion appliance exhaust venting.

You must be logged in as an InterNACHI member to see this card's explanation, comments and suggested report narratives.

All Flashcards