High wind and extreme weather systems
The weather hazards that load a building enclosure and the scale or standard that speaks to each, a worked wind screening for a roof edge with two pressure bases, how storms and hail damage edge metal, and how to verify a claim and document a failure.
4 lessons · about 52 min · 15 diagrams · 3 videos
Version 1.0.0
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Lessons
0 of 4 complete
Lesson 1 · 12 min · 12 slides · 10 questions
High wind and extreme weather systems: principles and terminology
Why the roof perimeter is a leading place for wind failures, the six hazards a building enclosure faces, the difference between a gust and a sustained wind, what the hurricane and tornado scales do and do not say, how wind loads a roof edge, and the stop-work boundary.
You will be able to: Name the weather hazards that load or damage a building enclosure, say which scale or standard speaks to which, and define gust, sustained wind, suction and internal pressure well enough to read a wind report without misusing it.
Not startedStart →Lesson 2 · 15 min · 12 slides · 12 questions
High wind and extreme weather systems: materials, standards and design constraints
Which document answers which weather question: the ASCE 7 edition and map, the IBC edge rule and ES-1, tornado provisions, the Florida High-Velocity Hurricane Zone, hail test classes, how metal reacts to hail, and what a manufacturer rating or warranty means.
You will be able to: Match each hazard to the document that answers it, say what ASCE 7, the IBC, ES-1, the Florida protocols and the hail test classes cover, and state what each does not cover.
Not startedStart →Lesson 3 · 12 min · 11 slides · 9 questions
High wind and extreme weather systems: methods and worked application
A six-step screening method, a fully worked example for a parapet coping, how velocity pressure grows with the square of speed, two pressure bases, where a manufacturer value fits, a second example from SPRI, and the limits of the screening.
You will be able to: Carry a documented wind screening for one roof edge from site facts to demand numbers, show two safety-factor bases, set a manufacturer's published value beside the result without a verdict, and decide what the engineer must be handed.
Not startedStart →Lesson 4 · 13 min · 11 slides · 10 questions
High wind and extreme weather systems: defects, verification and case study
How roof edges fail in storms, what the field record from Andrew, Ivan and Michael shows, how to inspect after a storm, cosmetic and functional hail damage on metal, how to verify a claim, FEMA corrective options, a fictional case study and the evidence to document.
You will be able to: Read a wind or hail failure pattern, decide whether damage is cosmetic or functional, check a product claim against a test, and write the evidence a reviewer needs.
Not startedStart →
Practical task
Prepare a wind and weather screening packet for one fictional parapet coping job. Use the inputs your instructor gives you for basic wind speed, exposure, mean roof height, risk category and enclosure. Match each hazard to the right scale or document, work the corner and perimeter uplift by hand on both bases, and write the questions the engineer of record must answer. Then write up a supplied description of storm or hail damage as cosmetic or functional.
Hand in
- A hazard list for the site that names the right scale or document for each hazard and says what it does not tell you
- A marked-up section of the coping showing the load path and the wind loads, and a plan sketch of the roof zones with their widths in feet
- The assumptions and units, then velocity pressure, perimeter uplift and corner uplift worked by hand from the stated equation and checked against the AFS screening method
- Basis A and basis B pressures side by side, with no pass or fail stated and the manufacturer value, if used, shown with its own note
- The question list for the engineer of record: edition, basic wind speed, tornado check, tested assembly and substrate
- A defect analysis of the supplied damage description that separates cosmetic from functional damage and lists what was not measured
Rubric
| Criterion | Meets the standard when |
|---|---|
| Hazards matched | Each hazard is paired with the document that answers it; a hurricane category, an EF rating and a warranty speed are never used as a design speed. |
| Arithmetic | Velocity pressure uses the square of the speed, the zone coefficients and internal pressure are shown, and the hand numbers agree with the screening method to within rounding. |
| Two bases | Strength level times 2.0 and strength level times 0.6 times 2.0 are both shown, and the choice is left to the engineer of record. |
| No verdict | No pass or fail is stated and no manufacturer rating is called a project check; a verdict is said to need a test of the exact assembly. |
| Evidence | Assumptions, units and gaps are written down, cosmetic and functional damage are separated by the coating and seam checks, and the packet says what was not measured. |