Building and Design Criteria

City of Bismarck Codes

The following codes are currently enforced by the City of Bismarck:
  • 2015 International Building Code (IBC)
  • 2015 International Residential Code (IRC)(including Appendix E & J)
  • 2015 International Fire Code
  • 2015 International Fuel Gas Code (IFC)
  • 2015 International Mechanical Code (IMC)
  • 2015 International Energy Conservation Code (IECC)
  • 2009 ND State Plumbing Code w/Amendments (including Appendix H)
  • 2017 National Electric Code/Wire Standards of ND

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