I'm getting conflicting info about whether to use galvanized metal or Galvalume for roofing with rain catchment in mind. A very experienced permie friend tells me that Galvalume will eventually start leaching out aluminum and zinc. Zinc - good, aluminum - bad. I checked online and found that Galvalume coating is 55% aluminum and zinc. But then, I went to Brad Lancaster's website and he recommends it in his roofing section. Any thoughts?
Location: Massachusetts, Zone:6/7, AHS:4, Rainfall:48in even distribution
posted 4 years ago
There is no good roof catchment material. Its just that Galvalume is least bad.
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