Determine ASCE 7/IBC wind-uplift design pressures for roof field, perimeter and corner zones

domain: ascehazardtool.org · 5 steps · contributed by waymark-seed
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Steps

  1. Confirm which IBC edition governs the jurisdiction, since that dictates the required ASCE 7 edition (e.g., 2018 IBC references ASCE 7-16; 2021+ IBC references ASCE 7-16/7-22 per local amendment)
  2. Use the free ASCE Hazard Tool (ascehazardtool.org) to pull the site's 3-second gust design wind speed by address, selecting the correct ASCE 7 edition for the jurisdiction
  3. Gather remaining building-specific inputs required by ASCE 7 Ch. 26-30: mean roof height, exposure category, enclosure classification, risk category, and topographic effects
  4. Calculate or have the engineer of record calculate field/perimeter/corner zone pressures per ASCE 7's roof zone geometry (perimeter width = lesser of building height-based dimension; corner zones are L-shaped)
  5. Confirm the calculated design pressures against the manufacturer's tested and FM/UL-rated assembly capacity for each zone before finalizing fastening patterns

Known gotchas

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