The half pegged bladed scarf joint is a half-lap joint with the addition of the tongues or blades connecting one beam to the other. The blades add more surface area and create a strong, attractive joint. It is commonly utilized for either a sill plate or roof plate, but if you add some all-thread steel rods or structural screws, it could be used in areas with light sustained tension. This bladed scarf joint uses pegs to secure the two timbers together.
Like all other scarf joints, this half pegged bladed scarf joint allows you to span distances longer than the timbers on hand.