[Cob] roofing

[Thad Feetham]

  Galvanized Roofing for potable water.
   
  I would not assume that just because water has been collected for hundreds of years that there is no leaching or that there are no problems.
   
  I respect the reply.  And I admit that I really dont know for sure that leeching of the gavanzation occurs.  Galvanized roofing was not developed for the express purpose of collecting potable water.  I think we can agree on that.  
   
  How to we get the real answer?  The question is:  Does galvanized roofing leech harmful metals into water collected for drinking?  Does this roofing material maintain over time or does it degrade in such a way that older roofing is more likely to leech heavy metals of some sort?
   
  I thank-you Lance for the reply.  Lets see if we can get the real answer now.  (with a varifiable source)   Anyone?
   
  Peace
  thad

Lance Collins <collinsl at bigpond.net.au> wrote:
  Hi Thad,

You said

>Galvanized metal would certainly leech into the water.

What absolute rubbish!!. Galvanized steel roofing has been used for 
rainwater collection in Australia for a hundred years without any 
problems with zinc leaching.

I collect water from my zincalume roof and the water quality is excellent.

Where did you get that idea?

Lance (in Aus)


>
> 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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