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Flagstaff, Arizona Building Codes

Updated : 04/22/2024

Overview

Flagstaff, AZ adopts the following codes:

  • The International Building Code, 2018 edition, including Appendices C (Group U), I, J, and N. Flagstaff, AZ Muni. Code § 4-02-001-0001 (adoption and amendments).
  • The International Residential Code, 2018 edition, including Appendices H, J, M, Q, R, S, and T. Flagstaff, AZ Muni. Code § 4-03-001-0001 (adoption and amendments).
  • The International Existing Building Code, 2018 edition. Flagstaff, AZ Muni. Code § 4-04-001-0001 (adoption and amendments).
Helpful resources for Flagstaff, Arizona include the following.

Residential Building Code

Arizona has yet to adopt a statewide residential code. Local laws will control.See PLRB, Arizona Building Codes for more information on state level codes.

Flagstaff adopted the 2018 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Flagstaff ? Undetermined
Citation: Flagstaff, AZ Muni. Code § 4-03-001-0001.
Municipal Code https://www.codepublishing.com/AZ/Flagstaff/html/Flagstaff04/Flagstaff0403000.html#4.03.001.0001
Comments:

Section R301, Design Criteria

Ground snow load: 60 psf

Wind design – Speed (mph): 115

Wind design – Topographic Effects: NO

Wind design – Special wind region: NO

Wind design – Windborne debris zone: NO

Seismic design category: C

Subject to damage from – Weathering: Moderate

Subject to damage from – Frost line depth: 30 inches

Subject to damage from – Termite: Moderate to heavy

Winter design temperature: 4 degrees F

Ice barrier underlayment required: YES

Flood hazards: a)12-16-1975, b)0l-19-1983, c)09-03-2010*

Air freezing index: 1013

Mean annual temperature: 45.4 degrees F

Comments

Flagstaff, AZ adopts the International Residential Code, 2018 edition, including Appendices H, J, M, Q, R, S, and T. Flagstaff, AZ Muni. Code § 4-03-001-0001 (adoption and amendments).

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

Refer to Appendix J of the adopted 2018 IRC.

Commercial Building Code

Flagstaff adopted the 2018 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about amendments to the model code here.

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Comments

Flagstaff, AZ adopts the International Building Code, 2018 edition, including Appendices C (Group U), I, J, and N. Flagstaff, AZ Muni. Code § 4-02-001-0001 (adoption and amendments).

 

Existing Buildings

Flagstaff, AZ adopts the International Existing Building Code, 2018 edition. Flagstaff, AZ Muni. Code § 4-04-001-0001 (adoption and amendments).

Other Building Codes

Flagstaff, AZ also adopts the following codes:

  • The International Mechanical Code, 2018 edition. Flagstaff, AZ Muni. Code § 4-05-001-0001 (adoption and amendments).
  • The International Plumbing Code, 2018 edition, including appendices C. Flagstaff, Az. Muni. Code § 4-06-001-0001 (adoption and amendments).
  • The International Fuel Gas Code, 2018 edition. Flagstaff, AZ Muni. Code § 4-07-001-0001 (adoption and amendments).
  • The International Energy Conservation Code, 2009 edition. Flagstaff, AZ Muni. Code § 4-08-001-0001 (adoption and amendments).
  • The International Solar Energy Provisions, 2018 edition. Flagstaff, AZ Muni. Code § 4-09-001-0001 (adoption and amendments).
  • The International Swimming Pool and Spa Code, 2018 edition. Flagstaff, AZ Muni. Code § 4-10-001-0001 (adoption and amendments).
  • The National Electrical Code (NFPA-70), 2017 edition. Flagstaff, AZ Muni. Code § 4-11-001-0001 (adoption and amendments).
  • The International Fire Code, 2018 edition, including Appendices B, D, E, F, G,  H,  I, J, K, L, M, and N. Flagstaff, AZ Muni. Code § 5-02-001-0001 (adoption and amendments).
  • The International Wildland Urban Interface Code, 2006 edition, including Appendices A, B, C, and D. Flagstaff, AZ Muni. Code § 5-02-001-0001 (adoption and amendments).