[Greenbuilding] Toxic Materials in Roof Runoff

Koehn Chris chris at koehn.com
Mon Aug 11 13:08:34 MDT 2014

Interesting- thanks for sharing.
I'm surprised by the "zincalume" run-off: I've used this and similar products under the assumption they were quite benign. Good to know.

Chris Koehn
Vancouver Island

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