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Joint Root
This is the point that the lap model uses as the joint root in many of the calculations. This is not the definition of joint root, but rather what the lap model will use as the joint root.

Basically, just take the lower right point of the upper plate and drop a line straight down until it intersects the lower plate at the joint root.
Joint Root Pic0
Joint Root Pic1
Joint Root Pic2
The Joint Root is found by extending a line perpendicular to the lower plate through the lower right point of the upper plate.
Joint Root Pic3
If there is a curved lower plate, then the upper plate is considered horizontal. The joint root is found by extending a line perpendicular to the lower surface of the upper plate through the lower right corner of the upper plate.