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  Codes & Regulations

Residential Construction Notes
Engineered plans and specifications must be built and followed as designed. International Residential Code construction notes become part of the approved plans and are for your information. The following construction notes are not a complete list of code requirements. 

Residential Construction Notes 


The West Jordan City Building & Safety Division uses the following design criteria when reviewing projects submitted for a building permit within City limits.


1.      BUILDING CODES:  The Building Division enforces the following building codes with State amendments.

·        2015 International Building Code

·        2015 International Residential Code

·        2015 International Plumbing Code

·        2015 International Mechanical Code

·        2015 International Fuel Gas Code

·        2015 International Energy Conservation Code

·        2016 International Existing Building Code

·        2015 International Fire Code

·        2014 National Electric Code

·        1997 Uniform Code for Abatement of Dangerous Buildings

·        City of West Jordan Municipal and Development Codes


2.      SNOW LOADS: 

a)      Site-specific:  The actual snow loads vary depending upon elevation.  A minimum flat roof snow load (Pf) of 30psf and ground snow load (Pg) of 43psf shall be used for sites up to 4,500 feet mean sea level.  Table 1 may be used to find the minimum ground snow loads at elevations greater than 4,500 feet.  For elevations not shown in Table 1 refer to Section 15A-3-107 of Utah’s “State Construction and Fire Codes Act”.

Table 1 – West Jordan City Snow Loads

Elevation (feet)

Pg (psf)

= 4500












                    * Table only valid if site elevation is within 100 feet of listed elevation.

b)     Roof Snow Loads:  Shall be determined per Chapter 7 of ASCE 7-10. 

c)     Seismic Snow:  At locations where the roof snow load exceeds 30psf a percentage of the snow load must be considered in the effective seismic weight of the structure per Section 15A-3-107 of Utah’s “State Construction and Fire Codes Act”.


3.      WIND:

a)      Speed:  All wind speeds listed below are 3-second gust at 33 feet above the ground.

·        Residential:  115 mph

·        Commercial (see IBC Table 1604.5):

-        Risk Category I = 105 mph

-        Risk Category II = 115 mph

-        Risk Category III & IV = 120 mph

b)     Exposure:  Site specific (per Chapter 26 of ASCE 7-10). Typically “B” or “C”.


4.      SEISMIC:

a)      Seismic Design Category:

·        Residential:  D2

·        Commercial:  D

b)     Site-specific:  Because ground motions tend to vary substantially throughout the city, the mapped spectral accelerations (SS & S1) should be obtained by considering the site-specific latitude and longitude values for the site and obtaining the ground motions from the “U.S. Seismic Design Maps” application developed by the USGS (  


5.      SOILS:

a)      Frost Depth:  30 inches.

b)     Site Class:  Site specific.  For projects not requiring a geotechnical report (see below) Site Class ‘D’ can be assumed per Section 20.1 of ASCE 7-10.

c)      Allowable Bearing Pressures: 

·        Foundation pressure:  1,500psf, per IRC Table R401.4.1 and IBC Table 1806.2.

·        Lateral pressure:  100psf/f, per IBC Table 1806.2.

·        The above listed values are maximum allowable values unless listed otherwise by a site-specific geotechnical report complying with IBC 1803.6.

d)     Site-specific Geotechnical Report:

·        General:  All geotechnical reports submitted for permit issuance must be dated no later than two years from the permit application date.  Outdated reports must be accompanied by a letter from a qualified geotechnical engineer stating that the report requirements are still valid, or stating what items may have changed. 

·        Residential:  Residential projects meeting one or more of the following requirements must provide a site-specific geotechnical report meeting the requirements of IBC 1803.6:

-        Where the building footprint is greater than 3,000 square feet, or has a gross square footage of 6,000 square feet or greater; or

-        Where the grade supporting the structure has a slope equal to or greater than 20 percent; or

-        Where the building is to be built on a lot in which a previous structure once existed.

·        Commercial:  All commercial projects require a site-specific soils report meeting the requirements of IBC 1803.6.  Additions to existing facilities of less than 3,000 square feet are exempt from this requirement.



a)      Flood Hazard Areas: 

·        Residential:  Buildings and structures located in flood hazard areas (i.e. Flood Zones A or V) must comply with IRC R322.

·        Commercial:  Buildings and structures located in flood hazard areas must comply with IBC 1612, Chapter 5 of ASCE 7-10 and ASCE 24-13.

b)     Floodways:  Buildings and structures located in identified floodways must be designed and constructed in accordance with ASCE 24-13.

c)      Interactive Flood Zone Map:  Available at the following web link…


7.      RAINFALL:  Average annual rainfall is 16 inches.


8.      CLIMATE ZONE:  5B


9.      WEATHERING:  Severe


10.   TERMITE:  None to Slight






13.   AIR FREEZING INDEX:  = 1500



Last Revised:  09/2016

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