Martin Thompson
10/22/2007
On average, how much rust should I expect at the eave edge of my prepainted galvanized roof over a period of 20yrs under normal conditions? (not an animal confinement, not near salt water, rural location, 4:12 slope. 1/4", 3/4", 2" in??
Brian Selig
Architectural Building Components Metal Roof and Wall Panels
10/24/2007
I'm not sure how extensively this has been measured. There is no limitation to this. Galvanized, prior to being painted, typically does not come with a warranty. Many manufacturers have moved away from Zinc galvanization on their steel to zinc-aluminum to extend the protection. In our standing seam systems, we hem the panels at the eave to hide them. There are studies available: search galvanized vs. galvalume.
Todd Miller
Classic Products, Inc.
10/24/2007
I really do not think there is anything verifiable in regards to this either. There are also so many variations in terms of grades of steel and coatings.
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