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Electrolysis of Copper Weathervane and Lead Flashing





September 21, 2008

Would a copper weathervane fitted to the ridge of a slated roof of a house effect the lead flashings?

Jean Falle
customer - Jersey, Channel Islands, Europe



September 25, 2008

Hi, Jean. Galvanic corrosion only occurs if there is a metallic connection between the dissimilar metals. However, the green corrosion salts of copper frequently run down and stain things, and if they run onto the lead, it would seem that they can pit it (based on book knowledge, never actually seen it).

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


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