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permaculture - Re: [permaculture] Roofing materials and water collection

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  • From: "Lawrence F. London, Jr." <venaurafarm@bellsouth.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] Roofing materials and water collection
  • Date: Sat, 14 May 2011 00:33:32 -0400

On 5/14/2011 12:31 AM, Lawrence F. London, Jr. wrote:

question put to Google like:
"toxicity problems with rainwater collected off metal roofing"

Tried that phrase and got:

Information on Zinc Oxide in Construction - Zinc Metal Roofing Systems
The run-off water can contain zinc ions. Since zinc is an element
essential for life and most organisms ... For instance, rainwater
collected from VM ZINC roofs, can be used without any known problems for
watering plants. ... Actually there are many types of heavy metals some
that are toxic and some that are not. ...
www.metal-roofing-zinc.com/zinc_roofing_basics.htm - Cached - Similar

and:

http://www.homesteadingtoday.com/archive/index.php/t-376478.html

Key reply:
"I wouldn't drink rainwater off a roof unless it had been sterilized by
some means, boiling or chlorine or such. Bird poop can carry some nasty
parasites and pathogens. You can do it, and get away with it, but it is
a gamble."

And a few online manuals in PDF format:

[PDF]
The Texas Manual on Rainwater Harvesting
File Format: PDF/Adobe Acrobat - Quick View
by R Harvesting - Related articles
Metal. The quantity of rainwater that can be collected from a roof is in part a function ... assuming no toxic sealant is used; however, cost considerations may ... running off the eaves of a building. Some gutter installers can provide ..... potential problem of leaking from an aftermarket fitting. Polypropylene ...
www.twdb.state.tx.us/.../rainwaterharvestingmanual_3rdedition.pdf - Similar
[PDF]
Chapter 7: Water Collection
File Format: PDF/Adobe Acrobat - Quick View
9 For water quality issues, contact the New Mexico Environment ... Figure 7-1: A pitched metal roof is the most efficient catchment surface for rainwater harvesting. ... When the collected water is designated for nonpotable uses such as ... and low toxicity. When choosing a surface for a new roof, it is important ...
www.ose.state.nm.us/water-info/.../pdf.../Roof.../RRL-Chapter-7.pdf - Similar:





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