Pegged Bladed Scarf Joint

bladed scarf joint

This bladed scarf joint uses pegs to secure the two timbers together. Commonly utilized for either a sill plate or roof plate, if you add some all-thread steel rods or structural screws, it could be used in areas with light sustained tension.
This joint is a half-lap joint with the addition of the tongues or blades. You can use a chain mortiser to cut out for the blades making this a relatively straightforward process of cutting it.

bladed scarf joint

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8 Responses to Pegged Bladed Scarf Joint

  1. Glen Vermette May 30, 2017 at 7:21 pm #

    We use this a lot Brice, We taper the tenon a 1/8″ to ease fit up and installation.

    • Brice Cochran May 31, 2017 at 7:18 am #

      Makes sense to me Glen, thanks for your comment!

  2. Jim@TheTradesmanChannel 2017 June 6, 2017 at 5:54 pm #

    Does this scarf perform well when used for a top plate that has a decent amount of rafter thrust?

    • Brice Cochran June 7, 2017 at 4:58 pm #

      It will however, in conjunction with the pegs I would use some fully threaded structural screws or all thread to resist any rolling in the joint.

  3. Jeff Wahl July 14, 2017 at 4:58 pm #

    This page really helped me out. Appreciate all the details and the use of a model. Great job!

  4. Nick July 20, 2017 at 9:26 am #

    I used this joint recently on the top beam of a long wall. (I used 8 pegs, though, not 4) It was so strong that I could lift one end of the beam (28 ft) and there was no visible flex at all at the joint.

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