Effects of various joint configurations and gap sizes on the electromagnetic shielding effectiveness (SE) are evaluated to provide guidelines for best design of joints in order to increase the value of SE. Four different joint geometries are presented. A sharp decrease on SE with larger gap size for simple joints is observed. Addition of bends in the joint geometry has strong positive effect on the value of the SE. Increasing the angle of cut, which increases the effective length of the joint were also demonstrated to have increasing effect on the shielding performance.