Nevada County Municipal Code Ch. 3 California Building Code Amendments

The California Building Code as adopted by 14.01.140 is adopted with the following amendments.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Appeals resulting from decisions or determinations made by the Building Official relative to the application and interpretation of this Code shall be heard by the Building and Accessibility Standards Board of Appeals as set forth in Section 14.02.030.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Work exempt from permit requirements shall be as set forth in the 2022 California Building Code, Section 105.2, as adopted by Nevada County, with County amendments.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

The time limitation of permit applications shall be as set forth in the California Building Code, Section 105.3.2, as adopted by Nevada County, with County amendments.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Permit expiration for every permit issued by the Building Official shall be as set forth in the California Building Code, Section 105.5, as adopted by Nevada County, with County amendments.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Permit fees shall be as set forth in the fee schedule adopted by Resolution of the Nevada County Board of Supervisors.

Plan review fees shall be as set forth in the fee schedule adopted by Resolution of the Nevada County Board of Supervisors.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

RAMADA is any freestanding roof, or shade structure, installed or erected above a mobile home, manufactured home, commercial coach, or any portion thereof.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

The roof covering or roofing assembly on any structure regulated by this Code, unless specifically exempted, shall be listed Class A, as classified in Section 1505.1.

The roof covering assembly includes the roof deck, underlayment, interlayment, insulation and covering, which is assigned a roof covering classification.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

UNDERLAYMENT ICE DAMS. An "ice dam" or "ice guard" is required on the roofs of heated buildings constructed at elevations above 4,000 feet above sea level. All roofs, regardless of covering, with a pitch of less than eight (8) in twelve (12) shall be protected against leakage (caused by ice and snow) by either: (1) a base sheet of felt solid cemented to the roof sheathing with an approved cementing material, or (2) an approved manufactured membrane installed per the manufacturer's specifications. Application shall extend from the roof eave edge up the roof to a line five (5) feet horizontally inside the exterior wall line of the heated building and up thirty (30) inches along each side of a valley. Where there exists both conditioned space and unconditioned space, the required covering shall also extend horizontally to a point at least five (5) feet onto the unconditioned space. This "ice dam"/"ice guard" shall be in addition to any underlayment otherwise required.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Above 4,000 feet elevation above sea level, valley flashing shall be installed to the requirements for severe climate (areas subject to wind-driven snow and ice buildup).

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Above 4,000 feet elevation above sea level, underlayment shall be installed to the requirements for severe climate (areas subject to wind-driven snow and ice buildup).

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

A. All of Nevada County is declared a snow area. Buildings and structures shall be designed to resist snow loads as set forth herein or per ASCE 7-22, whichever is greater. Except as provided in this Section, snow load requirements shall be as shown in Tables 14.03.120-C-1 and 14.03.120-C-2.

Table 14.03.120-C-1 Snow load requirements applicable west of the west section line of Sections 5, 8, 17, 20, 29 & 32 R. 16 E., T 17 and 18 N., M.D.B. and M.

Table 14.03.120-C-2 Snow load requirements applicable east of the east section line of Sections 5, 8, 17, 20, 29 & 32 R. 16 E., T 17 and 18 N., M.D.B. and M.

Intermediate values may be interpolated from Table 14.03.120-C-1 and Table 14.03.120-C-2 by proportion.

B. The snow loads for within Sections 5, 8, 17, 20, 29 and 32 R., 16 E., T. 17 and 18 N., M.D.B. and M. shall be on a straight line proportion between the values shown in Table 14.03.120-C-1 and Table 14.03.120-C-2 based on the distance of the site from the boundary of the transition zone.

C. Higher snow loading than those shown in Tables 14.03.120-C-1 and 14.03.120-C-2 may be required by the Building Official in local areas of known higher snow accumulation.

D. Deviations from the above set forth snow loading may be permitted by the Building Official, provided the snow load and conditions in each individual case are derived and certified by a registered or licensed design professional who can show proper experience in snow load evaluation. Snow load design procedure shall be as set forth in Section 1608.

E. In no case shall the design snow load be less than 20 psf.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023); Ord. 2552. (01/13/2026))

1608.2.1

RAMADAS. Mobile homes or commercial coaches that do not meet the applicable snow load requirement of Title 25, California Code of Regulations, or Section 14.03.120 above for their location, shall be protected by a ramada designed for the loading. A registered or licensed design professional shall design such ramadas. (Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Depth of ground snow may be calculated by dividing the applicable snow load set forth in Section 14.03.120 above by twenty-five (25).

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Unbalanced Snow Loads for Ground Snow Loads Over 100 PSF

The following conditions are for the leeward side of a structure. The windward loading shall be in accordance with Section 14.03.150.

1.) For roof pitches of less than 6/12 (26.6 degrees) where the ground snow load (Pg) exceeds 100 psf, the unbalanced snow load need not exceed:

0 psf at the ridge and (hr)y psf at the eave (see Figure 14.03.150.1-1)

Where:

hr — Vertical distance between the eave and the ridge (ft)

y — Density of snow (pcf)

[Figure: Figure 14.03.150.1-1]

Figure 14.03.150.1-1

2.) For roof pitches of 6/12 (26.6 degrees) and greater where the ground snow load (Pg) exceeds 100 psf where the roof is partially exposed or sheltered in Terrain Category B and C, or sheltered in Terrain Category D, the unbalanced snow load need not exceed the sloped roof snow load (Ps). Terrain Categories are those defined in Table 7.3-1. For areas not meeting the terrain category and exposure as described, the unbalanced snow load need not exceed the load as defined in 1.) above.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

y = 25 pcf

(in SI: y = 3.9 kN/m³)

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

a. Definitions: Partially Exposed: all roofs except as indicated in the following text. Fully Exposed: roofs exposed on all sides with no shelter afforded by terrain, higher structures, or trees. Roofs that contain several large pieces of mechanical equipment, parapets that extend above the height of the balanced snow load (hb), or other obstructions are note in this category. Sheltered: roofs located where there are very tight conifer trees in very close proximity to a structure, r if an obstruction, such as a tall hill, is located within a distance of 10 times the height of the difference in height between the top of the roof and the top of the obstruction as noted in footnote "b."

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

TABLE 7.3-2 THERMAL FACTOR, Ct

a These conditions shall be representative of the anticipated conditions during winters for the life of the structure.

b Greenhouses with constantly maintained interior temperature of 50°F (10°C) or more at any point three (3') feet above the floor level during winters and having either a maintenance attendant on duty at all times or a temperature alarm system to provide warning in the event of a heating failure.

c A specifically designed cold roof is defined as a well vented (exceeding code minimum) roof with an insulation system intended to mitigate icing at the eaves, which creates an air-tight or nearly air-tight envelope below the well-ventilated space.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

Unless erected on solid rock, to protect against frost and freezing, the minimum foundation depth is eighteen (18") inches below grade if between 4,001-7,000-foot elevation and twenty-four (24) inches below grade for 7,000-foot elevation and above.

Exception: Interior footings shall be a minimum of twelve (12") inches below grade.

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))

The top of the barrier shall be at least sixty (60") inches (1524mm) above grade measured on the side of the barrier that faces away from the swimming pool. The maximum vertical clearance between grade and the bottom of the barrier shall be two (2") inches (51mm) measured on the side of the barrier that faces away from the swimming pool. Where the top of the pool structure is above grade, the barrier is authorized to be at ground level or mounted on top of the pool structure, and the maximum vertical clearance between the top of the pool structure and the bottom of the barrier shall be four (4") inches (102mm).

(Ord. 2374. (01/14/2014); Ord. 2424. (12/13/2016); Ord. 2473. (01/14/2020); Ord. 2515. (12/06/2022); Ord. 2515. (12/13/2022); Ord. 2531. (10/24/2023))