While the hammer joint seems mainly aimed at birch plywood, [Jiskar] mentions testing it in other materials, such as bamboo, MDF, and even acrylic, although wood seems to be the best application.

Fran: You see how the wood overlaps each other? That is why it's called a lap joint. Richard: So the lap joint is stronger? Fran: That's right, the groove in one piece of wood holds the other ...