Vertical cracks commonly occur at corners of masonry buildings due to thermal/moisture movement and differential movements in walls. Crack stitching uses shaped stainless steel rods bonded into walls across cracks at regular intervals to reinforce cracked areas. Reinforcing external corners involves using helical bars bent at right angles that are bonded into wall slots with grout to form concealed reinforcement layers stitching cracks. Drive-in helical wall ties are also used, corkscrewing from building corners into flanking walls to reconnect and strengthen masonry. Horizontal wall channels are cut and filled with grout for inserting crack stitching bars to dissipate loads over 500mm on each side of cracks. Metal ties are widely used in traditional buildings for wall