Building Codes and Design Criteria

Adopted Building Codes

Effective July 1, 2023:

2021 International Building Code, including appendices C & J
2021 International Residential Code, including appendix AQ
- Except residential provisions of Chapter 11, Energy Efficiency.
2021 International Plumbing Code
2021 International Mechanical Code
2021 International Fuel Gas Code
2020 National Electrical Code issued by the National Fire Protection Association (NFPA)
2015 International Energy Conservation Code (residential)
2021 International Energy Conservation Code (commercial)
2021 International Existing Building Code
2021 International Swimming Pool & Spa
Manufactured Home:
- Subsection 15A-2-104(2), the HUD Code
- Subsection 15A-2-104(1), Appendix AE of the 2021 International Residential Code
- Subsection 15A-2-104(1), 2005 NFPA 225 Model Manufactured Home Installation Standard, issued by the NFPA
Historic Buildings:
- Subsection (3) for standard guidelines pertaining to plaster on a historic property, as defined in Section 9-8-302, the US Department of the Interior Secretary's Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings

Ground Snow Load*	IRC Wind Design (speed)	IBC Wind Design (speed)	Exposure Category	Seismic Design Category	Subject to Damage from Weathering	Frost Line Depth	Subject to Damage from Termite	Ice Barrier Underlayment Required
25 psf	90 mph	Risk Category I - 105 mph Risk Category II - 115 mph Risk Category III - 120 mph Risk Category IV - 120 mph	C	D₀	Severe	18 inches	Moderate	No

* General Chart based on area, for more specific snow load to your property visit Utah University Utah Ground Snow Load