AC417 1/2-inch Enhanced Sag-resistant Gypsum Ceiling Board—Approved January 2019, editorially revised March 2019 (PDF Download)

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AC417 3-2019
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AC417 establishes guidelines for evaluation of 1/2-inch-thick sag-resistant gypsum ceiling board meeting or exceeding the humidified deflection performance requirements of Section 12 of ASTM C1396, installed using proprietary fastening specifications to achieve enhanced sag resistance.

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