Building Design Wind Speeds
Risk Category I
Buildings and other structures that represent a low hazard to human life in the event of failure, including but not limited to:
- Agricultural facilities
- Certain temporary facilities
- Minor storage facilities
- Screen enclosures
Risk Category II
Buildings and other structures except those listed in Occupancy Categories I, III, and IV
Risk Category III & IV
Category III:
Buildings and other structures that represent a substantial hazard to human life in the event of failure, including but not limited to:
- Covered structures whose primary occupancy is public assembly with an occupant load greater than 300.
- Buildings and other structures with elementary school, secondary school or day care facilities with an occupant load greater than 250.
- Buildings and other structures with an occupant load greater than 500 for colleges or adult education facilities.
- Health care facilities with an occupant load great than 50 or more resident patients, but not having surgery or emergency treatment facilities.
- Jails and detention facilities.
- Any other occupancy with an occupant load greater than 5,000.
- Power-generating stations, water treatment for potable water, waste water treatment facilities and other public utility facilities not included in Occupancy Category IV.
- Building and other structures not included in Occupancy Category IV containing sufficient quantities of toxic or explosive substances to be dangerous to the public if released.
Category IV:
Building and other structures designated as essential facilities, including but limited to:
- Hospitals and other health care facilities having surgery or emergency treatment facilities.
- Fire, rescue and police stations and emergency vehicle garages.
- Designated hurricane or other emergency shelters.
- Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response.
- Power-generation stations and other public utility facilities required as emergency backup facilities for Occupancy Category IV structures.
- Structures containing highly toxic materials as defined by Section 307 where the quantity of the material exceeds the maximum allowable quantities of Table 307.1.(2).
- Aviation control towers, air traffic control centers and emergency aircraft hangars.
- Buildings and other structures having critical national defense functions.
- Water treatment facilities required to maintain water pressure for fires suppression.
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