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Galvanized lag bolts and stainless railing

I'm putting up a stainless steel handrail, (on a beach house) that is being lagged to a roof deck with galvanized lag bolts and hot mopped over. Will I still get corrosion under the hot mop.

Dave Amborn
Metal Worker - Ventura, California, USA
November 16, 2010

Hi, Dave. If it was my house I'd want stainless lag bolts. Who can say whether the bolts will last 2 years or 40 years? It's only guesswork. You have galvanic action from a relatively small zinc surface connected to a very large stainless surface, and you probably also have galvanic forces from a large amount of copper infused into the pressure treated wood. The hot mopping may work, or there may be porosity that keeps the bolts wet after a rain. The whole world is ganging up on those little cathodically active galvanized lag bolts. Poor things.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
November 16, 2010

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