[Cob] Silverfish, Tornadoes, and Humidity -- and roof!

[CarmenKittieCat at aol.com]

ap615 wrote: (snip)"...I'd guess we should build our overhangs and do our  
best to tie the roofs on to the rest of the buildings, using the same strategies 
 as conventional building."(snip)
 
Would that be what the chains on this cob cottage are for? 
_http://www.cobworks.com/images/hilde/hildesoutsidehighview.jpg_ 
(http://www.cobworks.com/images/hilde/hildesoutsidehighview.jpg)  To  hold the roof to the ground? How 
effective would chains be? I don't think a  tornado would care about two 
(relatively) little chains ... they have to be  for something else. My fiance and I 
wondered if the chains served some  practical purpose or if they were just 
decoration. I think that cottage looks  like a cute little toadstool, especially from 
this view: _http://www.cobworks.com/images/hilde/hildesoutsidefrontdoor.jpg_ 
(http://www.cobworks.com/images/hilde/hildesoutsidefrontdoor.jpg)  What  kind 
of roof is that and is it very difficult to do? It looks almost like it is  
rather precariously balanced, and yet it also looks very solid.
 
Thanks again,
Carmen