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"Galvanic corrosion nickel plated lightning rod on zinc coated roof"



June 22, 2017

Q. I am installing a zinc coated copper roof, if they install a nickel plated lightning protection through it will there be an electrolysis between the 2 metals?

Robert Dillon
roofing - Vero Beach, Florida
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July 2017

A. Hi Robert. Nickel plating is highly galvanically incompatible with zinc, and it's presence will accelerate galvanic corrosion of the zinc. However, it will probably not be a problem anyway because there is a lot more zinc than nickel, and rain water is not very conductive. A Bob Villa video claims the materials are compatible: although they're actually not, the experience of the installers is additional evidence that it probably won't actually be a problem. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
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