The timeframe before a water-damaged ceiling collapses varies dramatically based on the volume of the leak, the type and thickness of the ceiling material (drywall versus plaster), and whether water is pooling in a sagging pocket. A torrential roof leak or major pipe burst can saturate drywall to the point of catastrophic collapse within a few hours or even minutes. Conversely, a slow, continuous pinhole pipe leak may take weeks or months of gradual saturation, causing sagging, bowing, and eventual failure under the heavy weight of trapped water. Verification: Never stand directly beneath a sagging, water-filled ceiling bulge.
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