[Greenbuilding] Roofing material for Rain Harvesting

[Nick Pyner]

Cadmium is found as an impurity in zinc. This is not the same thing as "used
in".

I hope to god your friend is a non-smoker and, even in that event, you had
better warn him not to eat chocolate, potatos, or peanuts, stop drinking
Coca-Cola and immediately refrain from chewing on the end of a
yellow-painted pencil.

Ah yes, and be very choosy about the fertilisers in the garden.

Your local environmental protection body is probably a good resource on this
matter and, will probably have more to say about pollution falling on the
roof than what the roof is made of. Much the same can probably be said about
the soil your food is grown in.

Nick Pyner

Dee Why   NSW

  -----Original Message-----
  From: Greenbuilding
[mailto:greenbuilding-bounces at lists.bioenergylists.org]On Behalf Of Arnie
Katz
  Sent: Sunday, 18 August 2013 12:15 AM


   A friend suggested that might not be such a good idea, since, along with
the zinc, cadmium is used in the galvanized coating. A bit of research
verified that, yes, galvanized steel typically has cadmium in it;
  That was enough for me to abandon the experiment and move to a different
design for enabling my wife,

   It does make me question whether galvanized roofing is suitable for
rainwater collection if the water is to be used for food crops.

  Arnie Katz


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