Title 15A Chapter 3 Section 107

State Construction and Fire Codes Act
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, 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. 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 snow loads specified in Table 1608.1.2(b) shall be used for the jurisdictions identified in that table. Otherwise, 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.

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)

 

REQUIRED SNOW LOADS FOR SELECTED UTAH CITIES AND TOWNS1,2

 

The following jurisdictions require design snow load values that differ from the Equation in the Utah Snow Load Study.

 

County

City

Elevation

Ground Snow Load (psf)

Roof Snow Load (psf) 6

 

Carbon

Price3

All other county locations5

5550

--

43

--

30

--

 

Davis

Fruit Heights3

4500 - 4850

57

40

 

Emery

Green River3

4070

36

25

 

Garfield

Panguitch3

6600

43

30

 

Rich

Woodruff3

Laketown4

Garden City5

Randolph4

6315

6000

--

6300

57

57

--

57

40

40

--

40

 

San Juan

Monticello3

6820

50

35

 

Summit

Coalville3

Kamas4

5600

6500

86

114

60

80

 

Tooele

Tooele3

5100

43

30

 

Utah

Orem3

Pleasant Grove4

Provo5

4650

5000

--

43

43

--

30

30

--

 

Wasatch

Heber5

--

--

--

 

Washington

Leeds3

Santa Clara3

St. George3

All other county locations5

3460

2850

2750

--

29

21

21

--

20

15

15

--

 

Wayne

Loa3

7080

43

30

 

1The IBC requires a minimum live load - See 1607.11.2.

 

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 Ce =1.0, Ct =1.0 and Is =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, 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) 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."

            (11) A new IBC, Section 1613.5, is added as follows: " 1613.5 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 297, 2013 General Session