Often the length of a span in a timber frame is longer than the size of your lumber. That is when you will need to use a scarf joint to join two timbers together. There are many types of scarf joints, and this under squinted stop splayed scarf joint with screws is one of them.
The splay refers to the long diagonal cut that creates the surfaces to be joined. The thickness at the end of the splay is angled back a bit (the under squint). This little angle helps to create a stronger joint, and also adds a cool detail to your frame.
All timber frame joints need to be secured together – in this case, we use 6 pairs of structural screws. That allows us to take a bit less wood from the beam when securing the under squinted stop splayed scarf joint with screws.
