Originally posted by Derek J Swanger:
The theory of wrapping a parachute around a frame and see how it handles the loads. The stand alone frame is a myth. The roofs are always sheated. 
DerekDerek,
I have seen and worked on a lot of roofs that were not sheathed. They had a tyvek type mebrane across the rafters and furring strips on top, laid perpendicularly to the rafters. The purpose of the furring was to provide cross ventilation and be the installation layer for shingles/slate/reed. The furring cetainly did not add to the structual integretity of the roof or frame. So the stand alone frame is no myth.
