[Cob] Green insulation?

[yew]

Anna Young wrote:

 >Does this product ring any bells for anyone? We would love to
 >find an insulation for our house roof that is sustainably made,
 >non-toxic, fire-resistant and recyclable..

I think it's kind of like a low-density polyurethane foam (unless I'm 
confusing it with some other product).  It's only "green" in the sense 
that it saves a lot of energy in heating costs.  I'm not sure whether 
there's a non-petrochemical equivalent.  I don't think Icynene is 
recyclable, but again, I'm not sure.  I imagine it's just about as 
flammable (and as toxic when exposed to fire) as any other type of 
petroleum-based foam.

But again, all of this assumes I'm remembering the type of insulation 
correctly.  If I'm not, I'm sure someone will happily correct me.  ;)

Brina