[Cob] spiral roofs

[yew]

aaron allen wrote:

 >I love the pictures of "spiral" round
 >wood roofs from owlswamp.com.  a friend
 >once suggested such a roof for cob
 >structures but could offer no real advise or
 >direction.  please tell me where someone
 >might learn about these roof designs.

I don't have any direct experience with them, but you might check Tony Wrench's 
book "Building a Low-Impact Roundhouse".  You can see examples of his roofing 
methods here:

http://website.lineone.net/~tonywrench/courses.htm
http://website.lineone.net/~tonywrench/how.htm

Brina