While I still consider JLC to be a trusted disseminator of valuable information in the ever-changing world of building technology, I can’t imagine how Milton Grenfell’s letter was deemed fit for print (“Don’t Use Stainless Steel Screws With Copper,” 4/09).

Mr. Grenfell cites the galvanic (electrochemical) scale to make his point. There are many versions of this scale — which shows reactions between dissimilar metals — and there are several different common alloys of stainless steel. Copper’s reaction to some types of stainless steel is actually less severe than its reaction to lead, which Mr....

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