Updated : 04/22/2024

Overview

Johnston, IA has adopted the 2015 International Codes, with amendments, including the 2015 IRC and IBC. Johnston, IA Muni. Codes § 155.02 (adoptions) and § 155.03 (amendments).

Helpful resources for Johnston, Iowa include the following.

• 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.

Johnston adopted the 2015 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.

Auto Search - beta:

No results were located with the automated search.

Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Johnston ? Yes
Citation: § 155.03
Municipal Code https://online.encodeplus.com/regs/johnston-ia/doc-viewer.aspx#secid-3991
Comments:

Table 301.2 (1) CLIMATE AND GEOGRAPHICAL DESIGN CRITERIA

Ground Snow Load		30 psf.
Wind Design
	Speed (MPH)	90 mph
	Topographical Effects	NO
	Special Wind Regions	NO
	Windborne Debris Zone	NO
Seismic Design Category		A
Subject to Damage From
	Weathering	Severe
	Frost Line Depth	42"
	Termite	Mod/Hvy
Winter Design Temp.		-5 deg. F
Ice Barrier/Underlayment Required		Yes
Flood Hazards		19-Jul-00
Air Freezing Index		1833
Mean Annual Temp.		48.6 deg

Comments

Johnston, IA has adopted the 2015 IRC including appendices H, M and O. Johnston, IA Muni. Code § 155.02.

Commercial Building Code

Johnston adopted the 2015 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.

Auto Search - beta:

No results were located with the automated search.

Comments

Johnston, IA has adopted the 2015 IBC including appendix C. Johnston, IA Muni. Code § 155.02.

Existing Buildings

Johnston, IA has adopted the 2015 IEBC. Johnston, IA Muni. Codes § 155.02 (adoption) and § 155.03 (amendments).

Other Building Codes