Trusses with Exposed Bottom Chords

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Trusses with Exposed Bottom Chords

  • The IBC does not prohibit the use of exposed truss bottom chords. 
  • Since interior grade OSB is allowed on the underside of an exposed truss, it follows that there would not be a more stringent requirement for exposed trusses. 
  • The USDA Forest Products Laboratory’s Wood Handbook provides the average equilibrium moisture content of wood exposed to the outdoor atmosphere for various cities in the United States.