Wind Load Definitions

  • MRH: Mean Roof Height, The height above grade level of the midpoint of the roof. Mean roof height is calculated by averaging the eave and ridge heights, and is used in the design pressure calculations.
  • NOA: Notice of Acceptance, Issued by Miami-Dade County given to product that have been tested and approved for use in the High Velocity Hurricane Zone.
  • HVHZ: High Velocity Hurricane Zone, defined by the Florida Building Code as Dade and Broward counties in south Florida.
  • DASMA: Door Access Systems Manufactures Association is the Trade Association for the garage door industry. They create test standards specifically for garage doors and work with code bodies to get them put into the building codes.
  • ANSI/DASMA 108: Test standard for testing garage doors to loads generated by the wind. This test is known as the uniform static air pressure test.
  • ANSI/DASMA 115: Test standard for testing garage doors to loads generated by flying debris typically found in high wind events. This test is known as the large missile impact test.
  • ASCE 7: American Society of Civil Engineers, is the basis for wind load calculations used in most building codes.
  • Design Pressure: The measurement of resistance in both positive and negative directions that a door system must withstand. Design pressures are expressed in pounds per square foot (PSF) and are expressed in both positive and negative values. Also known as design load. Design load is always 1-1/2 times less than test load.