Building officials have taken the unusual step of removing approvals for many brands of galvanized roofing nails because research shows some corrode in standard industry testing. Nails that were protected by electroplating, rather than by mechanical galvanizing or hot-dip galvanizing, quickly deteriorated -- a claim suppliers of hot-dipped and tumble-galvanized nails have been making for many years. Now university research seems to support them. University of Florida professor Kurt Gurley told JLC Online that research is still going on, and that the team had made no recommendation about removing those nails from the approval list. In that regard, Miami-Dade officials were acting on their own, so their decision will have no bearing on other communities in Florida or elsewhere.
Still, the testing has uncovered troubling evidence that electroplated galvanized nails won't pass a common industry test for corrosion resistance, raising the possibility they would rust quickly under some conditions in the field.