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300 Series Stainless Steel Roofing Nail and G-90 Galvanized Tin Cap
(-----) February 14, 2008
Hi My name is Manny Alvarez. I am a customer representative for a roofing company in Miami FL. I have a client who wants us to use stainless steel fasteners as much as possible. We can get stainless steel roofing nails but there are no stainless steel tin caps anywhere ( at least, I have not been able to find them). Does anyone know whether or not a 300 Series Stainless Steel roofing nail used in conjunction with G-90 galvanized tin caps will be a problem as part of a built up roofing assembly. The SS nails and G-90 tin caps would be entombed in the system by hot tar and modified asphalt roofing membranes. Thank you in advance for your help.Manny Alvarez
Roofing Contractor - Miami, Florida, USA
February , 2008
Although stainless steel and galvanizing are galvanically incompatible, the fact that stainless steel tends to passivate, and that you have a huge area of heavy zinc coating to protect a small amount of stainless, means that I would personally be very surprised if it was a problem.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Thank You TedManny Alvarez
Istueta Roofing - Miami, Florida, USA