Wind Components and Cladding Pressure (ASCE 7 Ch. 30)
The local envelope pressure wind-pressure cannot make: ASCE 7 Chapter 30 C&C design pressure p = qh [(GCp) - (GCpi)], where qh = 0.00256 Kz Kzt Kd Ke V^2 and GCpi = +/-0.18 (enclosed). A 115 mph Exposure C building draws qh 25.9 psf, and a roof corner (Zone 3, GCp = -1.8) sees -51.3 psf of suction - roughly double the field, the number a corner fastener and its spacing are designed for. GCp comes from the Ch. 30 zone figures (enter it). Local cladding pressure, not the whole-building MWFRS. A design aid, not the engineer of record's stamped design.
Formula and source
qh = 0.00256 Kz Kzt Kd Ke V^2; p_a = qh (GCp - GCpi); p_b = qh (GCp + GCpi); governing = the larger magnitude of p_a, p_b.
The ASCE 7-22 Chapter 30 components-and-cladding design pressure p = qh [(GCp) - (GCpi)], with the velocity pressure qh = 0.00256 Kz Kzt Kd Ke V^2 (Kd = 0.85, V in mph) and GCpi = +/-0.18 for an enclosed building, by name; GCp is read from the Chapter 30 zone figures.
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