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Spreading out the new 6 x 12 bottom chords and 12 x 12 floor beams
These members are Douglas Fir

bottom chord butt joints
This detail occurs on outer members that do not break on a floor beam
A diagonal bolt will complete the connection

Slots for oak shear keys are 1/2" deep on opposing members
The keys are 2" thick and provide an inch space between chord timbers when installed

Chip Ligon uses a template and router to tool the key slots
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including the history of Jay's Covered Bridge