Plaster ceilings are generally more prone to larger area failures compared to wall applications for several reasons. One primary factor is the sustained tensile forces experienced by the layers of plaster, lath, and lath fasteners due to their suspended self-weight from the point of installation onwards.
At a residential high-rise, staff reported concrete masonry cracking and water infiltration on the top floor of the parking garage during rain. Upon inspection, a continuous horizontal crack, up to 14.3 mm (0.5625 in.) wide, was found near the top of the concrete masonry unit (CMU) exterior wall, extending almost the entire length of one facade.
When specifying prefabricated building enclosure systems, project-specific quality assurance (QA) procedures, including a step-by-step review and documentation of the panel assembly during off-site fabrication, are often required.
Many industry groups recommend kick-out flashings, and various prefabricated options for three-sided flashings are available; however, they are not consistently used where needed. Two recent projects show the severe consequences when this critical component is omitted, leading to significant structural deterioration only a few years after construction.
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