Wind Load Design – Components and Cladding Wind Pressures per Chapter 30 of ASCE 7
Credits: 5 PDH
PDH Course Description:
Wind-related building-envelope failures often begin at localized components and connections rather than within the primary structural frame. Roof panels, wall panels, windows, doors, mullions, girts, purlins, fasteners, clips, edge zones, and corner zones can experience localized wind pressures substantially different from those used to design the main wind-force-resisting system (MWFRS). Correctly identifying these demands—and clearly communicating them to designers, manufacturers, contractors, and plan reviewers—is therefore a critical part of reliable wind-resistant design.
This course provides a practical engineering approach to the design and documentation of components and cladding (C&C) wind pressures in accordance with ASCE/SEI 7-22 Chapter 30, with emphasis on low-rise commercial, retail, warehouse, distribution, and light-industrial buildings. Participants follow the design process from applicability and wind parameters through effective wind area, pressure-zone identification, external and internal pressure coefficients, and conversion of pressure demands into practical member, panel, fastener, and attachment forces, with particular attention to one of the most common sources of C&C design errors: applying a single wind pressure to elements that have different effective wind areas, locations, support conditions, and load-transfer functions. The course also addresses the relationship between opening performance, enclosure classification, internal pressure, and the resulting C&C demands.
Multiple worked examples demonstrate the application of Chapter 30 to flat-roof and low-slope gable-roof commercial buildings, developing wall and roof pressure schedules, evaluating window and door pressures, comparing enclosed and partially enclosed conditions, and converting roof pressures into fastener forces and purlin line loads. The examples emphasize not only the correct numerical pressure, but also the intended element, applicable zone, effective wind area, and load-path interpretation, while addressing professional coordination issues in delegated design, product selection, and plan review—including strength-level versus allowable-stress pressure communication and preparation of pressure schedules usable without ambiguity by specialty engineers and product suppliers.
A central theme throughout the course is that an effective C&C calculation is more than a collection of pressure values: every design pressure should be traceable to its code basis, building surface, pressure zone, effective wind area, coefficient, internal-pressure assumption, and intended building-envelope component. By completing this course, participants will be better prepared to calculate, interpret, review, and communicate ASCE/SEI 7-22 components and cladding wind pressures, evaluate pressure zones and enclosure assumptions, and prepare review-ready C&C pressure schedules suitable for construction documents, delegated design, product submittals, and plan review.
Topics:
By the end of this course, participants will be able to:
- Distinguish components and cladding (C&C) wind design from main wind-force-resisting system (MWFRS) design and identify building-envelope elements governed by ASCE/SEI 7-22 Chapter 30.
- Determine the ASCE/SEI 7-22 wind parameters required for C&C design, including basic wind speed, exposure, velocity pressure, directionality, topographic effects, enclosure classification, and internal pressure.
- Calculate effective wind areas for secondary framing members, panels, windows, doors, mullions, fasteners, clips, and other local building-envelope components.
- Identify applicable wall and roof pressure zones and evaluate the increased suction demands that can occur in edge and corner regions, and select and apply appropriate external and internal pressure coefficients to determine controlling design pressures.
- Calculate C&C pressures for flat-roof and low-slope gable-roof commercial and industrial buildings using practical worked examples, evaluating demands for roof and wall panels, girts, purlins, windows, doors, mullions, and local fasteners.
- Assess how opening performance and enclosure classification affect internal pressure and building-envelope wind demand, and differentiate wind-pressure resistance from windborne-debris impact requirements for windows, doors, and curtain walls.
- Convert C&C pressures into practical design actions, including panel demand, fastener and clip forces, attachment reactions, and secondary-member line loads, and compare pressure demands across elements with different effective wind areas.
- Evaluate members crossing multiple pressure zones using segmented loading, weighted-average procedures, or conservative governing-zone loading.
- Interpret strength-level and allowable-stress pressure information, coordinate C&C demands with product ratings and delegated design criteria, and prepare pressure schedules and drawing notes that clearly communicate code basis, zones, effective wind areas, and design assumptions.
- Identify common C&C design and plan-review deficiencies, including use of MWFRS pressures for cladding, omission of corner-zone demands, inappropriate fastener effective areas, and unclear pressure-level documentation.
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Intended Audience: This course is intended for structural and civil engineers, building officials, forensic engineers, and other design professionals who prepare, review, or coordinate components and cladding wind calculations for commercial and industrial building envelopes, roof and wall systems, and related attachments.
Publication Source: Ibrahim Metwally, PhD, PE