2023 Utah Code › Title 15A - State Construction and Fire Codes Act › Chapter 3 - Statewide Amendments Incorporated as Part of State Construction Code › Part 1 - Statewide Amendments to International Building Code › Section 107 - Amendments to Chapter 16 of IBC.

Effective 7/1/2023
15A-3-107.
Amendments to Chapter 16 of IBC.
(1) In IBC, Table 1604.5, Risk Category III, in the sentence that begins "Group I-2 Condition 1," a new footnote c is added as follows: "c. Type II Assisted Living Facilities that are I-2 Condition 1 occupancy classifications in accordance with Section 308 shall be Risk Category II in this table."
(2) In IBC, Section 1605.1, Exception 2 is deleted and replaced with the following:
"2. Where the allowable stress design load combinations of ASCE 7 Section 2.4 are used, flat roof snow loads of 30 pounds per square foot (1.44kN/m2) or less and roof live loads of 30 pounds per square foot (1.44kN/m2) or less need not be combined with seismic loads. Where flat roof snow loads exceed 30 pounds per square foot (1.44kN/m2), the snow loads may be reduced in accordance with the following in load combinations including both snow and seismic loads. S as calculated below, shall be combined with seismic loads.
S = (0.20 + 0.025 (A-5))Proof, where S shall be greater than or equal to 0.20Proof.
Where:
S = Weight of snow to be used in combination with seismic loads.
A = Elevation above sea level at the location of the structure (ft/1,000)
Proof = Design roof snow loads, Pf or Ps, psf
For the purpose of this section, snow load shall be assumed uniform on the horizontal projection without including the effects of drift or sliding. The Importance Factor, I, used in calculating Pf may be considered 1.0."
(3) In IBC, Section 1605.1 a new exception 4 is added as follows:
"4. ASCE 7-16 Section 2.3.6 Equation 6 shall be modified to 1.2D + Ev + Eh + L +f2S and 1.2D + Ev + Emh + L +f2S with f2 = (0.20 +0.025(A-5)) where the roof snow load exceeds 30 pounds per square foot (1.44kN/m2). Where A = Elevation above sea level at the location of the structure (ft/1000). f2 = 0 for roof snow loads of 30 pounds per square foot (1.44kN/m2) or less."
(4)IBC, Section 1608.1, is deleted and replaced with the following: "1608.1 General. Except as modified in Sections 1608.1.1 and 1608.1.2, design snow loads shall be determined in accordance with Chapter 7 of ASCE 7, but the design roof load shall not be less than that determined by Section 1607. Where the minimum live load, in accordance with Section 1607, is greater than the design roof snow load, the live load shall be used for design, but it may not be reduced to a load lower than the design roof snow load. Drifting need not be considered for design roof snow loads, less than 20 psf."
(5) A new IBC, Section 1608.1.1, is added as follows: "1608.1.1 Ice dams and icicles along eaves. Section 7.4.5 of Chapter 7 of ASCE 7 referenced in IBC Section 1608.1 is deleted and replaced with the following: 7.4.5 Ice Dams and Icicles Along Eaves. Where ground snow loads exceed 75 psf, eaves shall be capable of sustaining a uniformly distributed load of 2pf on all overhanging portions. No other loads except dead loads shall be present on the roof when this uniformly distributed load is applied. All building exits under down-slope eaves shall be protected from sliding snow and ice."
(6) A new IBC, Section 1608.1.2 is added as follows: "1608.1.2 Drifts on adjacent structures. Section 7.7.2 of ASCE 7 referenced in IBC, Section 1608.1, is deleted and replaced with the following: 7.7.2 Adjacent structures. At lower adjacent structures, the requirements of Section 7.7.1 shall be used to calculate windward and leeward drifts. The resulting drift is permitted to be truncated."
(7) A new IBC, Section 1608.2.1 is added as follows: "1608.2.1 Utah ground snow loads. Section 7.2 of ASCE 7 referenced in IBC, Section 1608.1 is modified as follows:
(a) In paragraph 1, 7.2-8 is deleted and replaced with 7.2-9.
(b) On Figure 7.2-1, remove CS and other ground snow load values in the state of Utah. Add red shaded region for the state of Utah with the following note: See note for Utah.
(c) The following is added to the Note on Figure 7.2.1: See Table 7.2-9 for Utah.
(d) Add Table 7.2-9 as follows:
TABLE 7.2-9
GROUND SNOW LOADS FOR SELECTED LOCATIONS IN UTAH
City/TownCountyGround Snow Load (lb/ft2)Elevation (ft)
BeaverBeaver355886
Brigham CityBox Elder424423
Castle DaleEmery325669
CoalvilleSummit575581
DuchesneDuchesne395508
FarmingtonDavis354318
FillmoreMillard305138
Heber CityWasatch605604
JunctionPiute276030
KanabKane254964
LoaWayne377060
LoganCache434531
ManilaDaggett266368
MantiSanpete375620
MoabGrand214029
MonticelloSan Juan677064
MorganMorgan525062
NephiJuab395131
OgdenWeber374334
PanguitchGarfield416630
ParowanIron326007
PriceCarbon315558
ProvoUtah314541
RandolphRich506286
RichfieldSevier275338
St. GeorgeWashington212585
Salt Lake CitySalt Lake284239
TooeleTooele355029
VernalUintah395384
Note: To convert lb/ft2 to kN/m2, multiply by 0.0479. To convert feet to meters, multiply by 0.3048.
1. Statutory requirements of the Authority Having Jurisdiction are not included in this state ground snow load table.
2. For locations where there is substantial change in altitude over the city/town, the load applies at and below the cited elevation, with a tolerance of 100 ft (30 m).
3. For other locations in Utah, see Bean, B., Maguire, M., Sun, Y. (2018), "The Utah Snow Load Study," Utah State University Civil and Environmental Engineering Faculty Publications, Paper 3589, http://utahsnowload.usu.edu/, for ground snow load values."
(8) A new IBC, Section 1613.1.1, is added as follows: "1613.1.1 Effective Seismic Weight. In ASCE 12.7.2 and 12.14.8.1 as referenced in Section 1613.1, Definition of W, Item 4 is deleted and replaced with the following:
4. Where flat roof snow load, Pf, exceeds 30 psf (1.44kN/m2), the snow load included in the effective seismic weight shall be calculated, in accordance with the following equation: Ws = (0.20 + 0.025(A-5))Pf >= 0.20 Pf.
WHERE:
Ws = Weight of snow to be included as effective seismic weight
A = Elevation above sea level at the location of the structure (ft./1,000)
Pf = Design flat roof snow load, psf.
For the purposes of this section, snow load shall be assumed uniform on the horizontal projection without including the effects of drift or sliding. The Importance Factor, Is, used in calculating Pf may be considered 1.0 for use in the formula for Ws."
Amended by Chapter 209, 2023 General Session