Utah Code 15A-3-107. Amendments to Chapter 16 of IBC
Current as of: 2023 | Check for updates
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Superseded 7/1/2023)
Superseded 7/1/2023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 1605.2, in the portion of the definition for the value of f2, the words “and 0.2 for other roof configurations” are deleted and replaced with the following: “f2 = 0.20 + .025(A-5) for other configurations where roof snow load exceeds 30 psf; f2 = 0 for roof snow loads of 30 psf (1.44kN/m2) or less. Where A = Elevation above sea level at the location of the structure (ft./1,000).” |
| (3) | In IBC, Sections 1605.3.1 and 1605.3.2, exception 2 in each section is deleted and replaced with the following: “2. Flat roof snow loads of 30 pounds per square foot (1.44 kNm2) or less need not be combined with seismic loads. Where flat roof snow loads exceed 30 pounds per square foot (1.44 kNm2), 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))Pf is greater than or equal to 0.20 Pf. 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) Pf = Design roof snow load, psf. For the purpose of this section, snow load shall be assumed uniform on the roof footprint without including the effects of drift or sliding. The Importance Factor, I, used in calculating Pf may be considered 1.0 for use in the formula for Ws”. |
| (4) | IBC, Section 1608.1, is deleted and replaced with the following: “1608.1 General. Except as modified in Sections 1608.1.1, 1608.1.2, and 1608.1.3, 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, pf, 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 roof snow loads, pf, 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 Thermal factor. The value for the thermal factor, Ct, used in calculation of pf shall be determined from Table 7.3-2 in ASCE 7. Exception: Except for unheated structures, the value of Ct need not exceed 1.0 when ground snow load, pg, is calculated using Section 1608.2.1.” |
| (7) | A new IBC, Section 1608.1.3 is added as follows: “1608.1.3 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.” |