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Active stainless in galvanized metal lath


Can you please advise me on the corrosion potential in securing G90 galvanized metal lath with 410 stainless steel fasteners. The application is stucco cladding in a coastal salt water region. I have not heard of an issue with doing this and the galvanic scale supplied in the Architectural Sheet Metal Manual (SMACNA) does not indicate a problem. However, the recommendation offered Engineers Edge does indicate a problem. Please advise and thank you for your time.

Todd E. Watson, PE


Irrespective of any possible interaction between the fasteners and the cladding, the use of 410 in a salt water coastal environment is, to say the least, a brave decision, and one that will almost certainly cause you a lot of grief later on.

Perhaps fasteners made from 316 or 317 might not be strong enough for your application (I'm thinking that you've gone to 410 because it can be heat treated to high strength), so you should consider fasteners made from 2205 duplex stainless.

Bill Reynolds
Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.

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