[Cob] roofing

[Clint Popetz]

On Thu, Jan 05, 2006 at 05:06:37PM +0000, willy at sdf.lonestar.org wrote:
> What about a living roof.  I can think of several benefits:
> - Storage of water.  In a hard rain the roof would act as a sponge.
> - Filter. The roof would filter the water, rather than leech toxic substances.  

If you get a deluge you'll get runoff, but my greenhouse has a living
roof, and it holds most of the water it gets during anything but
really heavy rains, making it not-so-useful for catchment.  And in
terms of filtering, it's not good enough to drink, once it passes
through the the bird poop and dirt, but it's fine for irrigation.

Living roofs are great, but if you're wanting catchment for eventual
drinking water, I'd look elsewhere.

			-Clint