2016 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 7/1/2016
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," a new footnote c is added as follows: "c. Type II Assisted Living Facilities that are I-2 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. W_s as calculated below, shall be combined with seismic loads.
  W_s = (0.20 + 0.025(A-5))P_f is greater than or equal to 0.20 P_f.
  Where:
  W_s = Weight of snow to be included in seismic calculations
  A = Elevation above sea level at the location of the structure (ft./1,000)
  P_f = 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 P_f may be considered 1.0 for use in the formula for W_s".

• (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."

• (5) A new IBC, Section 1608.1.1, is added as follows: "1608.1.1 Section 7.4.5 of Chapter 7 of ASCE 7 referenced in Section 1608.1 of the IBC is deleted and replaced with the following: Section 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 2p_f 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) In IBC, Section 1608.1.2, a new section is added as follows: "1608.1.2 Utah Snow Loads. The snow loads specified in Table 1608.1.2(b) shall be used for the jurisdictions identified in that table. Otherwise, the ground snow load, P_g, to be used in the determination of design snow loads for buildings and other structures shall be determined by using the following formula: P_g = (P_o² + S²(A-A_o)²)^0.5 for A greater than A_o, and P_g = P_o for A less than or equal to A_o.
  WHERE:
  P_g = Ground snow load at a given elevation (psf);
  P_o = Base ground snow load (psf) from Table No. 1608.1.2(a);
  S = Change in ground snow load with elevation (psf/100 ft.) From Table No. 1608.1.2(a);
  A = Elevation above sea level at the site (ft./1,000);
  A_o = Base ground snow elevation from Table 1608.1.2(a) (ft./1,000).
  The building official may round the roof snow load to the nearest 5 psf. The ground snow load, P_g, may be adjusted by the building official when a licensed engineer or architect submits data substantiating the adjustments.
  Where the minimum roof live load in accordance with Section 1607.12 is greater than the design roof snow load, such roof live load shall be used for design, however, it shall not be reduced to a load lower than the design roof snow load. Drifting need not be considered for roof snow loads less than 20 psf."

• (7) IBC, Table 1608.1.2(a) and Table 1608.1.2(b), are added as follows:
  • "TABLE NO. 1608.1.2(a)
  • STATE OF UTAH - REGIONAL SNOW LOAD FACTORS
  • COUNTYP_oSA_o
  • Beaver43636.2
  • Box Elder43635.2
  • Cache50634.5
  • Carbon43635.2
  • Daggett43636.5
  • Davis43634.5
  • Duchesne43636.5
  • Emery43636.0
  • Garfield43636.0
  • Grand36636.5
  • Iron43635.8
  • Juab43635.2
  • Kane36635.7
  • Millard43635.3
  • Morgan57634.5
  • Piute43636.2
  • Rich57634.1
  • Salt Lake43634.5
  • San Juan43636.5
  • Sanpete43635.2
  • Sevier43636.0
  • Summit86635.0
  • Tooele 43634.5
  • Uintah43637.0
  • Utah43634.5
  • Wasatch86635.0
  • Washington 29636.0
  • Wayne36636.5
  • Weber43634.5
  • TABLE NO. 1608.1.2(B)
  • REQUIRED SNOW LOADS FOR SELECTED UTAH CITIES AND TOWNS^1,2
  • The following jurisdictions require design snow load values that differ from the Equation in the Utah Snow Load Study.
  • CountyCityElevationGround Snow Load (psf)Roof Snow Load (psf) ⁶
  • CarbonPrice³
    All other county locations⁵5550
    --43
    --30
    --
  • DavisFruit Heights³4500 - 48505740
  • EmeryGreen River³40703625
  • GarfieldPanguitch³66004330
  • RichWoodruff³
    Laketown⁴
    Garden City⁵
    Randolph⁴6315
    6000
    --
    630057
    57
    --
    5740
    40
    --
    40
  • San JuanMonticello³68205035
  • SummitCoalville³
    Kamas⁴5600
    650086
    11460
    80
  • TooeleTooele³51004330
  • UtahOrem³
    Pleasant Grove⁴
    Provo⁵4650
    5000
    --43
    43
    --30
    30
    --
  • WasatchHeber⁵------
  • WashingtonLeeds³
    Santa Clara³
    St. George³
    All other county locations⁵3460
    2850
    2750
    --29
    21
    21
    --20
    15
    15
    --
  • WayneLoa³70804330
  • ¹The IBC requires a minimum live load - See Section 1607.12.
  • ²This table is informational only in that actual site elevations may vary. Table is only valid if site elevation is within 100 feet of the listed elevation. Otherwise, contact the local Building Official.
  • ³Values adopted from Table VII of the Utah Snow Load Study.
  • ⁴Values based on site-specific study. Contact local Building Official for additional information.
  • ⁵Contact local Building Official.
  • ⁶Based on C_e =1.0, C_t =1.0 and I_s =1.0"

• (8) A new IBC, Section 1608.1.3, is added as follows: "1608.1.3 Thermal Factor. The value for the thermal factor, C_t, used in calculation of P_f shall be determined from Table 7.3 in ASCE 7.
  Exception: Except for unheated structures, the value of C_t need not exceed 1.0 when ground snow load, P_g is calculated using Section 1608.1.2 as amended."

• (9) IBC, Section 1608.2, is deleted and replaced with the following: "1608.2 Ground Snow Loads. The ground snow loads to be used in determining the design snow loads for roofs in states other than Utah are given in Figure 1608.2 for the contiguous United States and Table 1608.2 for Alaska. Site-specific case studies shall be made in areas designated CS in figure 1608.2. Ground snow loads for sites at elevations above the limits indicated in Figure 1608.2 and for all sites within the CS areas shall be approved. Ground snow load determination for such sites shall be based on an extreme value statistical analysis of data available in the vicinity of the site using a value with a 2-percent annual probability of being exceeded (50-year mean recurrence interval). Snow loads are zero for Hawaii, except in mountainous regions as approved by the building official."

• (10) A new IBC, Section 1613.1.1, is added as follows: "1613.1.1 ASCE 12.7.2 and 12.14.8.1 of Chapter 12 of ASCE 7 referenced in Section 1613.1, Definition of W, Item 4 is deleted and replaced with the following:
  4. Where the flat roof snow load, P_f, exceeds 30 psf, the snow load included in seismic design shall be calculated, in accordance with the following formula: W_s = (0.20 + 0.025(A-5))P_f is greater than or equal to 0.20 P_f.
  WHERE:
  W_s = Weight of snow to be included in seismic calculations
  A = Elevation above sea level at the location of the structure (ft./1,000)
  P_f = Design roof snow load, psf.
  For the purposes 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 P_f may be considered 1.0 for use in the formula for W_s."

• (11) A new IBC, Section 1613.7, is added as follows: "1613.7 ASCE 7, Section 13.5.6.2.2 paragraph (e) is modified to read as follows: (e) Penetrations shall have a sleeve or adapter through the ceiling tile to allow for free movement of at least 1 inch (25 mm) in all horizontal directions.
  Exceptions:
  1. Where rigid braces are used to limit lateral deflections.
  2. At fire sprinkler heads in frangible surfaces per NFPA 13."

Amended by Chapter 249, 2016 General Session