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Metal Roofing

 
Posts: 91
Location: PNW
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I am currently designing our house and I have decided metal roofing will be the best option. My question is, what is the least toxic type of metal roofing (for rain capture)? I would assume aluminum is out of the question but I can't seem to find a lot information on steel types. Is zinc (galvanized) alright? What other non toxic metal options are there?

Also, because this will be a passive solar design, I want my roof to be reflective. To make it the most reflective, I would have to paint it white but would you want to collect rain from a painted roof?
 
pollinator
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Location: Porter, Indiana
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About 5 years ago I put a steel roof on my house and have been collecting rainwater off it for my trees/garden since it was put it. Even though the roof is steel, in terms of toxicity/leaching that is not all that important since most steel roofs have coatings of some sort over the metal. Mine has a copper colored coating which still looks as good as the day it was put on. I'm sure there's some toxicity in the resin/metal oxide coating, as everything is at least a little toxic, but so far my trees and plants show no ill effects.
 
Kris Arbanas
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For plants I wouldn't be as concerned, but for drinking water I'm not sure I would trust some of the coatings. I'm thinking galvanized would be safest (just zinc) but that is a very dull color and would require a more reflective paint.
 
gardener
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I would guess the painted would be less toxic after the paint is dry it's stable.
 
pollinator
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Thousands of homes on my island are on catchment water. The vast majority of those homes use bonded coated (colored) metal rooves. Water used for drinking usually goes through a filter to remove fine particles then through a UV lamp sanitizer.

I don't bother filtering or sanitizing water that goes or the livestock, garden, or general use.
 
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