Because about 80% of our watering supply is from roof-fed rainbarrels into a very intensive small-sized vegetable plot, the roofing material we choose to replace our battered asphalt shingles could theoretically have some long-term impact on our garden soil quality. However, there does not seem to be much readily available data on the topic (or at least not that I've yet found).
I have started to compile some info but thought I'd throw this post out in case some passer-by could recommend some info related to this topic. We are leaning toward a metallic roofing material, for several reasons. Metal roofing generally seems to be the preference for rain water collecting, provided it does not use large amounts of lead in the coating.
More to follow on this subject.
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