[permaculture] Roofing materials and water collection

Stephen Sherman spsherm at msn.com
Fri May 13 19:49:58 EDT 2011

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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