Galvanized Support Plate for Treated Wood Posts

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Old 12-01-10, 11:01 AM
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Galvanized Support Plate for Treated Wood Posts

I have a patio roof. The 6 x 6 treated wood posts are mounted / supported by galvanized steel base plates which in turn are lagged / bolted to concrete footers.

The galvanized base plates are no longer "shinny". Rather in spots they seem to have some corrosion spots. It is NOT the same color as rust. It's a very dark color - dark brown or almost black.

This is outdoors in Southwest Pennsylvania.

Is this NORMAL OR is there a problem with these galvanized base plates?
 
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Old 12-01-10, 11:27 AM
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Even galvanized stuff will oxidize. Compare a brand new galv trash can to one that has been exposed outside for a couple of years. The old one will be a very dark gray most times. Also depends on the galv coating..whether it was electroplated or hot dipped.

How old are these?
 
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Old 12-01-10, 12:05 PM
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Gunguy45,

Installed summer 2007 so 3+ years. My concern is these plates support the posts which in-trun support my porch roof. I have no clue how they were galvanized (although I know the difference).
 
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Old 12-04-10, 08:06 PM
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It may be the treated preservative leaching down to discolor the metal.

Gary
 
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