Building and Design Criteria

City of Bismarck Codes

The following codes are currently enforced by the City of Bismarck:

  • 2018 International Building Code (IBC)
  • 2018 International Residential Code (IRC)(including Appendix E & J)
  • 2018 International Fire Code
  • 2018 International Fuel Gas Code (IFC)
  • 2018 International Mechanical Code (IMC)
  • 2018 International Energy Conservation Code (IECC)
  • 2018 International Existing Building Code (IEBC)
  • National Electrical Code and the North Dakota State Wiring Standards adopted by the North Dakota State Electrical Board
  • Uniform Plumbing Code and the North Dakota State Plumbing Standards adopted by the North Dakota State Plumbing Board


IRC Climatic and Geographic Design Criteria Information 

  • Ground snow load: 35 psf
  • Wind Design speed: 115 mph
  • Wind Design topographic effects: NO
  • Wind Design special wind region: NO
  • Wind Design wind-borne debris zone: NO
  • Seismic Design Criteria: Zone A
  • Subject to Damage From weathering: Severe
  • Subject to Damage from frost depth: 4 feet
  • Subject to Damage from termite: NO
  • Winter Design Temp: -19
  • Ice Barrier Underlayment Required: YES
  • Flood Hazards: First FIRM adopted in 1985, current/revised FIRM adopted 2014.
  • Air Freezing Index: 4000
  • Mean Annual Temp: 42 degrees (F)


IRC Energy Efficiency Building Thermal Envelope Requirements

  • Climate Zone: 6A
  • Fenestration U-factor: 0.35
  • Skylight U-Factor: 0.60
  • Ceiling R-Value: 49
  • Wood Frame Wall R-Value: 20 or 13+5
  • Mass Wall R-Value: 15/19
  • Floor R-Value: 30
  • Basement Wall R-Value: 10/13
  • Slab R-Value and Depth: 10, 4ft
  • Crawl Space Wall R-Value: 10/13