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Re: USFS Wood Handbook
In Response To: Re: USFS Wood Handbook ()

More art than science?

In modern times it's become more science than art. Most structures these days use a lot of glulams for structural work. We don't have the stands of virgin timbers like in the 1800's and the structural behavior is more predictable.

For instance: I oversaw the rehabilitation project of a covered bridge about 11 years ago. The bridge was built in 1876. It had a Paddleford truss with added arches. Each original lower chord of the truss was comprised of two x 4 inch wide, 16 in tall and over 120 feet long pieces of eastern hemlock (we think). They ran from abutment to abutment and sandwiched the ends of the posts and diagonals. They were replaced with pressure-treated SYP (southern yellow pine) laminated beams.