[Cob] roofing

[Thad Feetham]

Wanted to get this question out there:
   
    Just have to ask.   What roofing material would be available to use as rainwater collection that would be safe to use for potable water?  Considering the abuse roofing material takes from the elements.  I would think that most any asphalt material would leech into the water.  Galvanized metal would certainly leech into the water.  Fiberglass would not last and would eventually degrade and leech into the water.  Plastic jugs or buckets cut to use for shingles are not UV stable and quickly become brittle and fail.   Other than stainless steel or copper which are obviously too expensive or glass; which would be fine in a greenhouse application, what would work?
   
  Just wondering.  Anyone?
  Peace
  Thad


			
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