Updated : 04/22/2024

Overview

Johnson County, IA has adopted the 2009 International Codes, with amendments, including the 2009 IRC and IBC. Johnson County, IA County Code § 8:4-1  (Download Code of Ordinances – Volume Two: Unified Development Ordinance and go to page 159; D for adoptions and page 106; E for amendments.)

While no formal code was located, per their website effective January 1, 2019 the code edition has been updated to 2018.

Helpful resources for Johnson County, Iowa include the following.

• Jurisdiction's Information Page(s):
  • Johnson County, IA Code of Ordinances
• PLRB, Ordinance and Law Coverage Discussion for Iowa

Residential Building Code

Iowa adopted a model state residential code but it is not in force unless adopted locally.See PLRB, Iowa Building Codes for more information on state level codes.

Johnson County 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 Johnson County ? Yes
Citation: § 8:4-1
Municipal Code https://www.johnson-county.com/dept_zoning.aspx?id=4811
Comments:

Table R301.2(1)

GROUND SNOW LOAD: 25

WIND Speed (mph): 90

SEISMIC DESIGN CATEGORY: A

SUBJECT TO DAMAGE FROM: Weathering – Severe, Frost Line Depth – 42”, Termite – Moderate/Heavy, Decay – Slight/Moderate

WINTER DESIGN TEMP: -5º F

FLOOD HAZARDS: FEMA –  2/16/07, Firm Maps –  2/16/07 

ICE SHIELD UNDERLAYMENT REQUIRED: Yes

AIR FREEZE INDEX: 2000

MEAN ANNUAL TEMPERATURE: 50º F

Government Officials

Comments

Johnson County, IA has adopted the 2015, updated to 2018 IRC including appendices F and G. Johnson County, IA County Code § 8:4-1  (Download Code of Ordinances – Volume Two: Unified Development Ordinance and go to page 159; D for adoptions and page 106; E for amendments.)

Commercial Building Code

Johnson County 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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Existing Buildings

Johnson County, IA did not adopt the IEBC, therefore Chapter 34 of the IBC would apply.

Other Building Codes