Cool roof!(well,in winter must be rather warm)
I think it's the best from isolation point of view,and the best from ecological
point of view.
My only concern is fire hazard.Ideas about that?
Another concern is to find the good straw.The straw that comes from modern harvesters
is useless.The big gras that's growing in swampy areas is the best I think.
Please let us know when you make progress in your investigations.
you're on a very interesting track.
cheers,
stonebrain