OverviewUsed for thatched roofs and wooden roofs. While it is a type of sickle joint, the joint with the mortise is made to resemble a half-empty chair to prevent twisting. This joint is known as the sickle joint or pole cart knowledge joint among others.
PrecautionsThe starting position of the notch should be from the full-face shaving. The joint position should be at the center of the rafter.