In clay masonry, how close to the corner should vertical expansion joints be placed? I have seen some buildings where the joints were placed 4 inches from the corner and others where they have been placed 2 feet or more from the corner. Which is better?
The Brick Institute of America in Technical Notes 18A recommends that the sum of the distances between the corner and the expansion joints on either face of the corner should not exceed the typical spacing of joints in the wall, as shown in the figure. The smaller of the two distances between joints and the corner should not exceed 10 feet. If these rules are followed, most corner cracking should be avoided. Deciding how close to the corner to place a joint normally depends on aesthetics and convenience.