This roofline might be of interest to fabricators and welders.
The framework is based on a five foot grid.  Only two rooflines are level.
Adjacent beam lines are tilted 1.4 degrees in both directions.
Before fabrication all the beams had to be twisted CW or CCW.
For the more common frames two horses spaced ten feet apart
were set at a sloping diffence of 2.8 degrees then the frame
members were located and the intermediates were inserted.