Envelope (Enclosure) Code Presentation

The 2019 California Energy Code, aka Building Energy Efficiency Standards—Title 24, became effective on January 1, 2020. Last month (June), the California Energy Commission released this comprehensive presentation on the nonresidential building envelope mandatory and prescriptive measures now in place.

BECx Checklist for Air Leakage

The CEC mandatory requirements include limiting air leakage in newly constructed nonresidential buildings, as well as additions and alterations to existing buildings. Design and construction documents are to clearly identify the air barrier components for each assembly, including detailing joints, interconnections and sealing of penetrations. Here is the list and an illustration of mandatory building locations.

Nonresidential Air Sealing Locations

  1. Air barrier and thermal barrier alignment
  2. Rim joists, sill plates, foundations, floor
  3. Soffits
  4. Risers and shafts for piping or ducts
  5. Exterior wall penetrations
  6. Windows and doors
  7. Plumbing, gas lines
  8. Lighting fixtures
  9. Ducts and registers
  10. Ventilation fans
  11. Elevator shafts
  12. Stairwells
  13. Attached parking garages
  14. Skylights
  15. Fire sprinklers

Not Shown

  • Common walls between attached dwelling units
  • Cantilevered floors
  • Flue and chimney shafts
  • Fireplace walls
  • Electrical conduits