2011 Utah Code
Title 15A State Construction and Fire Codes Act
Chapter 3 Statewide Amendments Incorporated as Part of State Construction Code
Section 107 Amendments to Chapter 16 of IBC.

15A-3-107. Amendments to Chapter 16 of IBC.
(1) In IBC, Table 1604.5, Occupancy Category III, in the sentence that begins Group I-2, a new footnote b is added as follows: "b. Type II Assisted Living Facilities that are I-2 occupancy classifications in accordance with Section 308 shall be Occupancy Category II in this table."
(2) In IBC, Section 1605.2.1, the formula shown as "f2 = 0.2 for other roof configurations" is 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, Section 1605.3.1 and Section 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. Ws as calculated below, shall be combined with seismic loads.
Ws = (0.20 + 0.025(A-5))Pf is greater than or equal to 0.20 Pf.
Where:
Ws = Weight of snow to be included in seismic calculations
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."
(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 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) In IBC, Section 1608.1.2, a new section is added as follows: "1608.1.2 Utah Snow Loads. The ground snow load, Pg, to be used in the determination of design snow loads for buildings and other structures shall be determined by using the following formula: Pg = (Po2 + S2(A-Ao)2)0.5 for A greater than Ao, and Pg = Po for A less than or equal to Ao.
WHERE:
Pg = Ground snow load at a given elevation (psf);
Po = 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);
Ao = 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, Pg, may be adjusted by the building official when a licensed engineer or architect submits data substantiating the adjustments. A record of such action together with the substantiating data shall be provided to the division for a permanent record.
The building official may also directly adopt roof snow loads in accordance with Table 1608.1.2(b), provided the site is no more than 100 ft. higher than the listed elevation.
Where the minimum roof live load in accordance with Section 1607.11 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
		COUNTY	Po	S	Ao
		Beaver	43	63	6.2
		Box Elder	43	63	5.2
		Cache	50	63	4.5
		Carbon	43	63	5.2
		Daggett	43	63	6.5
		Davis	43	63	4.5
		Duchesne	43	63	6.5
		Emery	43	63	6.0
		Garfield	43	63	6.0
		Grand	36	63	6.5
		Iron	43	63	5.8
		Juab	43	63	5.2
		Kane	36	63	5.7
		Millard	43	63	5.3
		Morgan	57	63	4.5
		Piute	43	63	6.2
		Rich	57	63	4.1
		Salt Lake	43	63	4.5
		San Juan	43	63	6.5
		Sanpete	43	63	5.2
		Sevier	43	63	6.0
		Summit	86	63	5.0
		Tooele	43	63	4.5
		Uintah	43	63	7.0
		Utah	43	63	4.5
		Wasatch	86	63	5.0
		Washington	29	63	6.0
		Wayne	36	63	6.5
		Weber	43	63	4.5

	TABLE NO. 1608.1.2(b)
	RECOMMENDED SNOW LOADS FOR SELECTED UTAH CITIES AND TOWNS(2)
				Roof Snow Load (PSF)	Ground Snow Load (PSF)
		Beaver County
		Beaver	5,920 ft.	43	62
		Box Elder County
		Brigham City	4,300 ft.	30	43
		Tremonton	4,290 ft.	30	43
		Cache County
		Logan	4,530 ft.	35	50
		Smithfield	4,595 ft.	35	50
		Carbon County
		Price	5,550 ft.	30	43
		Daggett County
		Manila	5,377 ft.	30	43
		Davis County
		Bountiful	4,300 ft.	30	43
		Farmington	4,270 ft.	30	43
		Layton	4,400 ft.	30	43
		Fruit Heights	4,500 ft.	40	57
		Duchesne County
		Duchesne	5,510 ft.	30	43
		Roosevelt	5,104 ft.	30	43
		Emery County
		Castledale	5,660 ft.	30	43
		Green River	4,070 ft.	25	36
		Garfield County
		Panguitch	6,600 ft.	30	43
		Grand County
		Moab	3,965 ft.	25	36
		Iron County
		Cedar City	5,831 ft.	30	43
		Juab County
		Nephi	5,130 ft.	30	43
		Kane County
		Kanab	5,000 ft.	25	36
		Millard County
		Millard	5,000 ft.	30	43
		Delta	4,623 ft.	30	43
		Morgan County
		Morgan	5,064 ft.	40	57
		Piute County
		Piute	5,996 ft.	30	43
		Rich County
		Woodruff	6,315 ft.	40	57
		Salt Lake County
		Murray	4,325 ft.	30	43
		Salt Lake City	4,300 ft.	30	43
		Sandy	4,500 ft.	30	43
		West Jordan	4,375 ft.	30	43
		West Valley	4,250 ft.	30	43
		San Juan County
		Blanding	6,200 ft.	30	43
		Monticello	6,820 ft.	35	50
		Sanpete County
		Fairview	6,750 ft.	35	50
		Mt. Pleasant	5,900 ft.	30	43
		Manti	5,740 ft.	30	43
		Ephraim	5,540 ft.	30	43
		Gunnison	5,145 ft.	30	43
		Sevier County
		Salina	5,130 ft.	30	43
		Richfield	5,270 ft.	30	43
		Summit County
		Coalville	5,600 ft.	60	86
		Kamas	6,500 ft.	70	100
		Park City	6,800 ft.	100	142
		Park City	8,400 ft.	162	231
		Summit Park	7,200 ft.	90	128
		Tooele County
		Tooele	5,100 ft.	30	43
		Uintah County
		Vernal	5,280 ft.	30	43
		Utah County
		American Fork	4,500 ft.	30	43
		Orem	4,650 ft.	30	43
		Pleasant Grove	5,000 ft.	30	43
		Provo	5,000 ft.	30	43
		Spanish Fork	4,720 ft.	30	43
		Wasatch County
		Heber	5,630 ft.	60	86
		Washington County
		Central	5,209 ft.	25	36
		Dameron	4,550 ft.	25	36
		Leeds	3,460 ft.	20	29
		Rockville	3,700 ft.	25	36
		Santa Clara	2,850 ft.	15 (1)	21
		St. George	2,750 ft.	15 (1)	21
		Wayne County
		Loa	7,080 ft.	30	43
		Hanksville	4,308 ft.	25	36
		Weber County
		North Ogden	4,500 ft.	40	57
		Ogden	4,350 ft.	30	43
	NOTES
	(1) The IBC requires a minimum live load - See 1607.11.2.
	(2) This 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."

(8) A new IBC, Section 1608.1.3, is added as follows: "1608.1.3 Thermal Factor. The value for the thermal factor, Ct, used in calculation of Pf shall be determined from Table 7.3 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 1608.1.2 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) In IBC, Section 1609.1.1, a new exception 7 is added as follows: "7. The wind design procedure as found in Sections 1616 through 1624 of the 1997 Uniform Building Code may be used as an alternative wind design procedure for signs and free standing walls as listed in item 7 listed in Table 16-H of the 1997 Uniform Building Code. The Importance Factor, I, shall be determined in accordance with Table 6-1 of ASCE 7. Stress increases are only allowed as provided in Section 1605.3 of the 2009 IBC."
(11) 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, Pf, exceeds 30 psf, the snow load included in seismic design shall be calculated, in accordance with the following formula: Ws = (0.20 + 0.025(A-5))Pf is greater than or equal to 0.20 Pf.
WHERE:
Ws = Weight of snow to be included in seismic calculations
A = Elevation above sea level at the location of the structure (ft./1,000)
Pf = 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 Pf may be considered 1.0 for use in the formula for Ws."
(12) A new IBC, Section 1613.8, is added as follows: "1613.8 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."