TOPIC: Product Selection
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We are getting ready to re-roof an older house and want this to be the LAST roof we ever install, so we'd like to get a metal roof. Unfortunately, we've got "perfection paralysis" with so many options out there. Our goals are both durability (no leaks ever!) and being non-toxic because we plan to do rainwater harvesting from the roof. Thus, we'd like a roof that is not treated with some sort of coating that could possibly leach chemicals into the water over years of weathering. Open to any and all suggestions! Thanks! :)
There are not many truly uncoated metal roofs available -- primarily zinc and copper, plus some "rusting" steels which tend to be high in chromium. Most of the steel roofs you see that appear to be mill finish are actually Galvalume with a clear acrylic coating (that does weather away after several years) One thing to consider is that a fairly inert coating may protect the metal from shedding metal ions. I do not know that the MRA / industry has a true position on this topic but, if you drop me an email at [email protected], I will be happy to share my thoughts on the subject. There are, by the way, a few metal roofing manufacturers who do promote their products as being good for water collection.
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