9.25.3 Air Barrier Systems

  • If panel-type air barrier material is used, all joints must be sealed to prevent air leakage
  • If flexible sheet material is used, all joints must be:
    • Sealed, or
    • Lapped not less than 4" (100mm) and clamped (between framing members, furring, blocking and rigid panels)
  • Air barriers not supported must maintain continuity by being sealed