"Z" Metal Hangers are Corroding

[randynavarro]

New deck. Less than 1 year.

Simpson brand "Z" hangers are used to hang the joists - hardware specifically for use with the new generation of treated wood.

Joists are pressure treated.

There is corrosion on every single hanger. . . ?

Any thoughts?

[Steven Hockstein]

Fasteners "Bleeding" onto the hangers?

[chicago]

like steven said what did they attach the hangers with? Galvinized?

[Brian G]

Got any photos Randy?

Brian G.

Always Loved Show & Tell [:-propell

[randynavarro]

Download Attachment: CorrodedHanger1.jpg

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Download Attachment: AnotherCorrodedHanger.jpg

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Download Attachment: ThirdCorrodedHanger.jpg

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[chicago]

The wood looks moist.Any chance its some sort of mineral deposit coming from chemicals in the wood.

[Brian G]

It looks fairly uniform. My first thoughts are a salty or alkaline environment, or a simple manufacturing defect. I'm not even sure if this type would react to the salty or alkaline though... Is this near the coast?

Brian G.

Big Fan of Salty []

[randynavarro]

Is Seattle the coast? I guess, indirectly. But no, its not direct exposure to salt water.

I guess we probably won't hit a definitve answer unless we were to call in the chemists!!

My best theory at this point, is that the decking has been coated with some sort of oil or sealer that is attacking the metal. The wood is some sort of Brazilian hardwood - ipe or jatoba or some cool-sounding-wood-that-sounds-good-to-put-on-the-real-estate-flyer-and-get-a-lot-more-money-for-the-home sort of wood.

Perhaps the coating wasn't the run-of-the-mill linseed oil or such.

First time I've seen it, though. I thought the "Z" series was supposed to be pretty inpenetrable stuff.