Scarf

In stitch and glue boats we are usually scarfing thin plywood. For plywood 1/8 inch thick the scarf length would be between 1 inch and one and one half inches.

The joint is usually held together with epoxy glue, although any waterproof glue would work.

Sometimes thicker wood is scarfed together with notched or keyed scarf joints, where the joint's strength comes all or partly from the interlocking pieces of wood.

Th advantage of a scarf joint over other joints is that when constructed with a reasonably strong glue, the joint is as strong as the wood around it, there is no increase in thickness at the joint and there is no loss of flexibility at the joint.

The most common way to cut the bevels of a scarf joint is with a block plane, although people have use routers, belt sanders and circular saw with success.