Trapped Ceiling-Cavity Water Load and Collapse Screen
The distributed load (a foot of water is 62.4 psf), total weight, and volume of water trapped overhead in a sagging ceiling cavity, with a drain-before-entry screen. The threshold is an editable screen value, not a code capacity - the fastening, span, and a structural engineer govern; this decides whether to punch-drain from a safe distance before anyone works beneath the bulge.
Formula and source
load_psf = (avg_depth_in/12) x 62.4; weight_lb = pooled_area_ft2 x (avg_depth_in/12) x 62.4 = volume_gal x 8.34; volume_gal = pooled_area_ft2 x (avg_depth_in/12) x 7.48052; drain_first = load_psf > threshold_psf.
Hydrostatic load and water density (62.4 lb/ft^3, 8.34 lb/gal, 7.48052 gal/ft^3) by name; ANSI/IICRC S500 safety practice. Not edition-bound.
Audience
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Posture
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