Design Criteria for Commercial Construction

Design Criteria for Commercial Construction in the City of Twin Falls

Links to design criteria are available at the bottom of the webpage.

Locally-adopted codes

2017 National Electrical Code (with Idaho State amendments)

2017 Idaho State Plumbing Code [website]

2018 International Building Code (with Idaho State amendments)

2018 International Fire Code [website]

2018 International Existing Building Code

2018 International Energy Conservation Code (with Idaho State amendments)

2018 International Mechanical Code (with Idaho State amendments)

2018 International Fuel Gas Code (with Idaho State amendments

2009 ICC A117.1-2009 Accessible and Usable Buildings and Facilities

1997 Uniform Code for the Abatement of Dangerous Buildings (per local ordinance)

Other Criteria

Wind speed: Designed per section 1609 of 2015 IBC (Vult=(105 mph) Category I, (115mph) Category II, and (120 mph) Category III and IV)

Wind exposure: “B” (“C” in some areas)

Ground Snow Load: 15 psf

Roof Snow Load: per IBC, but Section 1608 is amended to include that the minimum uniformly distributed design load shall be 25 psf. Table 1607.1 is amended to require a minimum uniform live load of 40 psf in habitable attics and sleeping rooms

Seismic Criteria: Per section 1613 of IBC [website]

Frost Depth: 24 inches

Presumed soil bearing pressure: 1500psf for “allowable stress design”; others to comply with Chapter 16

Climate Zone: 5B