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Brick masonry has an average life span of about 100 years, but the mortar joints will last only about half as long. That is why brick walls will sometimes require a repair process known as repointing. Loose or crumbling mortar and cracked or splitting mortar joints are caused by weathering or settling in the foundation. Where joint reinforcing was used the loose and cracked mortar may be due to corrosion of steel members embedded in the joints.