[permaculture] Roofing materials and water collection

Robyn Francis robyn at permaculture.com.au
Sat May 14 00:29:52 EDT 2011

I don't have a link to the report, but in the mid '90's our local Southern
Cross University did a major study of roof water quality getting 100's of
local residents to send in samples from their rainwater tanks stating the
roof material and kind of water tank. They found the best quality rainwater
was harvested off colourbond metal roofing (the paint is baked onto the
metal so doesn't peal or flake) and stored in cement water tanks.

On 14/05/11 9:49 AM, "Stephen Sherman" <spsherm at msn.com> wrote:

> We have a small building which is going to be roofed, and I am in the
> middle of choosing a roofing material. I would like to keep the option
> of collecting roof runoff open, and keep the roof as fireproof as
> possible. Those are the primary concerns for this choice of roof.
> I have heard/read the negatives about using water which came off asphalt
> shingle roofs, so those are probably not an option. That would seem to
> leave only a few choices:
> Ceramic tile roofs are out, due to their weight and structural concerns.
> Galvanized metal roofing seems like the best choice perhaps, for easy of
> use, fireproof-ness, and runoff quality (as far as I have heard).
> Another potential option is painted metal roofing (usually available in
> wider sheets than the plain galvanized, and longer lasting. Only problem
> is no manufacture seems to have any data about runoff water quality from
> their painted roof materials.
> I was wondering what people thought about these options; If there are
> any others which I've missed;  and if anyone had any hard data on
> painted metal roofing leaching whatever into the water runoff.
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Robyn Francis 
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