I could not help but comment about the Southern Yellow Pine (SYP). I worked for a local lumber yard for about 4 years, while there, the company set up a truss plant and began building all kinds of wood truss configurations. The largest I hauled were 54'-0" and 60'-0" long, all were built from kiln dried SYP, No. 1 & No. 2, don't recall any No. 3 in there, lumber was clearly stamped. All trusses were designed by an engineer and signed, stamped sealed drawings were created for each job. I am aware of the brittleness of SYP, but it was commonly used, and still is for trusses today.
I've worked in that shop, from setting the saws to make the webs, setting the jigs on the table, assembling and running the roller compressing the splice plates on each side, which are hand set then pressed when the giant roller is run from one end to the other. They were then sent via rollers outside to be stacked and bundles, then loaded onto a Dump D Matic expandable truss trailer, which I used to deliver the bundles.
Most problems with these trusses were the results of handling, those large ones I mentioned earlier were a big pain in the @ss to deal with, had the boiler shop next door make up a spreader bar for them. Sometimes when dumping the bundles, in cold weather a chord or web may hit a hard lump of frozen dirt or ice and fracture, SYP is definitely brittle.
Lou, some good reading on truss design, please take a look, might be a bit much, but good information
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