Analyzing Performance Values of Perimeter Edge Systems

January 25, 2019

Code (IBC) requires that Perimeter Edge Metal be tested per ANSI/SPRI ES-1 or ANSI/SPRI/FM 4435/ES-1 to resist the building design loads.1504.5 Edge securement for low-slope roofs

  • Low-slope built-up, modified bitumen and single-ply roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1, except basic design wind speed, v, shall be determined form figures 1609.3(1) through 1609.3(8) as applicable

Building design loads are to be calculated per Chapter 16 of IBC, which references ASCE 7:

  • 1609.1.1 Wind loads on every building or structure shall be determined in accordance with Chapters 26 to 30 of ASCE 7
  • Four factors must be considered when calculating wind load:
    • Wind Speed
    • Building Height
    • Exposure (terrain)
    • Importance (building use)

Wind loads are different for each of the 5 zones on the building exterior:

  1. Field of Roof
  2. Roof Perimeter
  3. Roof Corner
  4. Field of Wall
  5. Wall Corner

A warranty alone does not mean a product will resist design loads or that it has been tested as required by Code

  • Warranties are offered by manufacturers, and frequently are to given wind speeds; however, wind speed is only one factor used to determine design loads. Code requires that Perimeter Edge Metal be tested to resist the design load, which is a (negative) pressure, not a wind speed.