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So cooloutside in wrote:Wright used a similar truss for the long span at the north porch (off of the dining room) at the Willits House in 1901. I looked into this, and found that it was an old way of providing additional support for beams in old barns - something that Wright may have experienced in Wisconsin as a kid.
So they would have only been able to give it as much "pretensioning" as muscle could provide I assume.
SDR - yeah, the 1.75 does seems large. I would have thought 1" max