Zinc coating | Ask The Experts Forum | Metal Roofing Alliance

Randal Perisho 11/10/2011	Does anyone have an idea how long it takes to see red rust with the different ratingG-40 (40 oz per 100 sf) to G-90 (90 oz per 100 sf) or the AZ 45 (AlumZinc alloy)? It would be nice to understand if there is any correlation between real weather testing and an accelerated test.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/16799/find/
David Stermer 11/14/2011	Randal, Thanks for the question. I believe that USSteel publishes technical data about the performance galvanized and galvalume coatings on their web site. Obviously the performance is dependant on the project location and the building usage. Regards, David Stermer	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/16800/find/

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