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    David Kaplan

    Jessica,

    Generally speaking, you always want to use metals that are of the same material whenever possible because this prevents "galvanic corrosion."  If it is not possible to use the same metals with each other, say in your example copper nails don't exist, then the installer needs to utilize some sort of separation between the two metals to keep them from touching one another. 

    In my studying, there are some good charts out there which show which metals are good with one another and which ones are highly susceptible to galvanic corrosion.  I would recommend googling it and just taking a look.  I wouldn't recommend memorizing this, but it's good to have an idea of metals that coordinate with one another. 

    If you were presented with a question like this on the ARE, and maybe asked to pick the detail which shows a proper installation, you'd want to pick the one that uses the same metals throughout the assembly OR the one which shows proper isolation between the dissimilar materials. 

    Hope that helps.

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    Jessica Deaver

    Thanks David. This does help.

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