Galvanized confusion

Old 03-17-18, 08:20 PM
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Galvanized confusion

Hey all,

I am building a deck and researching flashing. Everything I've read says not to use galvanized flashing because it reacts with PT lumber yet galvanized fasters and hardware (nails, joist hangers, etc) are recommended to deck construction with PT lumber. That thoroughly confuses me. Am I missing a difference in the two applications?

Old 03-17-18, 08:28 PM
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You don't use aluminum flashing on treated wood. And some galvanized flashings do not have the high levels of zinc that z-max hangers and hot dipped galvanized fasteners do. To be safe, you just need to separate your flashing from treated wood with felt or a similar membrane. You can also give your galvanized flashing extra protection by spraying it with cold galvanizing.
Old 03-18-18, 05:51 AM
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I have never read not to use galvanized. I have always read that galvanized steel SHOULD be used and aluminum should be avoided. The copper in the wood treatment reacts with a corrodes aluminum.

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