Hopefully, this drawings will clear up the purpose of Hucks jig. It's a piece of wood representing the tetrahedron slice of the jack rafter side cut. For a 8:12 pitched roof you draw the jack rafter miter on the side of the material and then set your saw to 45° to cut the cheek cut for the jack rafter. Hucks jig is a slice from the jack rafter side cut.
Tetrahedron Slice unfolded showing the hip roof framing angles from Hucks jig.
- Rafter Slope Angle
- Jack Rafter Bevel Angle
- Purlin, Frieze Block and Square Tail Fascia Miter Angle
- Hip Rafter Slope Angle
- Hip Rafter Backing Angle
- Hip Rafter Square Tail Miter Angle