Tag Archives: Mortar joints

More about repointing: Matching sand

As noted in previous columns, successful long-term performance for repointing mortar joints in an existing masonry structure requires the development of an appropriate mortar mix, proper installation, and correct designation of the type and extent of work required.

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Primary seals are not secondary

A recently completed multistory building was experiencing significant water leakage directly below the interfaces of rising walls at setback roofs during prolonged wind-driven rain events. The building was principally clad with 150-mm (6-in.) thick architectural precast concrete (APC) panels finished by the fabricator with a 75-mm (3-in.) thick mortar-set stone veneer placed in a random rubble pattern.

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Repointing: Less is not always more

When repointing mortar joints in an existing structure, successful long-term performance depends on a number of factors. A lack of understanding of substrate materials and conditions, insufficient joint preparation, less than adequate skill or care during mortar installation and curing, and an overly limited repointing scope can lead to premature failure of a masonry joint repointing program.

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