Stop Bladed Scarf Joint

Stop Bladed Scarf Joint Transparent

If you need to span a distance greater than your lumber dimensions, scarf joints are the way to go. Another variation on the scarf joint, this stop bladed scarf joint is a half-lap joint with the addition of the stops, also called tongues or blades. The stops prevent twisting and also improve bending and tensile strength. If you need to lengthen either a sill plate or roof plate this joint would be a good choice.


You can use a chain mortiser to notch out the blades, making cutting this joint this fairly straightforward.

Stop Bladed Scarf Joint Solid Exploded and Joined

8 thoughts on “Stop Bladed Scarf Joint”

  1. Great information and illustrations.

    For the non-pegged joints, are fasteners used to hold the joints in place?

  2. Matthew Stevens

    I like a spayed scarf joint personally, others like the lapped scarf joints. In most cases, it comes down to personal preference.

  3. I love this joint! Can I use this type of pegged joint to join two timbers that are going to span a distance? For example I want to span a distance of 16ft but don’t have 16ft timbers. Can I join two 8ft beams with a pegged scarf joint in the middle and effectively span that gap? Thanks!!

  4. Katrina Williams

    Yes, Roger, if you need to create a beam longer than your lumber dimensions, a scarf joint is the way to go

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