4.509 — ALL ELECTRIC DWELLINGS

Newly constructed single family residential dwellings, including accessory dwelling units, shall be designed and constructed as an all-electric dwelling.

Exceptions:

Dwellings meeting CEC section 150.1(c)(14) exception 1 or exception 2.

Natural gas or propane cooking appliances.

Fossil fuel generators.

Accessory Dwelling Units that are attached to the primary dwelling unit, if the existing primary dwelling unit uses mixed fuel for space and water heating and the ADU services will be provided by the existing mixed fuel system.

For single family residential dwellings subject to section 4.509.1, subsequent improvements, additions, remodels, repairs or similar work shall be consistent with

(H)

Class A Roof Assemblies.

(1)

Roof Covering Assembly on Specified Structures. Notwithstanding any other provision of this code, the roof-covering assembly on the following structures regulated by this code shall be a Class A roof-covering assembly as classified in subsection (3).

(a)

Any new structure regulated by this code;

(b)

Any existing structure regulated by this code when more than fifty percent (50%) of the roof area of the structure is re-roofed;

(c)

Any addition regulated by this code when the addition creates a new roof and the floor area of any single floor of the addition exceeds six hundred forty (640) square feet.

(2)

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

(3)

Class A roof assemblies are those that are effective against severe fire test exposure. Class A roof assemblies and roof coverings shall be listed and identified as Class A by an approved testing agency. Class A roof assemblies shall be permitted for use in buildings or structures of all types of construction.

Exceptions:

(a)

Class A roof assemblies include those with coverings of brick, masonry or an exposed concrete roof deck.

(b)

Class A roof assemblies also include ferrous or copper shingles or sheets, metal sheets and shingles, clay or concrete roof tile or slate installed on noncombustible decks or ferrous, copper or metal sheets installed without a roof deck on noncombustible framing.

(c)

Class A roof assemblies include minimum 16 ounce per square foot (0.0416 kg/m 2 ) copper sheets installed over combustible decks.

(d)

Class A roof assemblies include slate installed over ASTM D226, Type II underlayment over combustible decks.

(4)

The following types of structures are exempt from this requirement:

(a)

Greenhouses.

(b)

Patio covers.

(c)

Fabric membrane structures when the fabric is certified as "flame retardant" by the State Fire Marshall.

(d)

Residential vehicle covers.

(e)

Awnings.

(f)

Sod roofs.

(g)

Agricultural Exempt Structures that comply with Sonoma County Code Section 7-7.

(h)

Agricultural Buildings not subject to the California Fire Code or not subject to the Sonoma County Code Chapter 13 as determined by the County's Fire Marshall.

(I)

Electrical Vehicle Infrastructure Training Program.

(1)

All electric vehicle charging infrastructure and equipment located on the customer side of the electric meter funded or authorized, in whole or in part, by the County of Sonoma shall be installed by a contractor with the appropriate license classification, as determined by the Contractors' State License Board, and at least one electrician on each crew, at any given time, who holds an Electric Vehicle Infrastructure Training Program certification

(2)

All electric vehicle charging infrastructure and equipment located on the customer side of the electric meter funded or authorized, in whole or in part, by the County of Sonoma that install a charging port supplying 25 kilowatts or more to a vehicle shall have at least 25% of the total electricians working on the crew for the project, at any given time, who hold Electric Vehicle Infrastructure Training Program certification.

(Ord. No. 6395, § I, 12-6-2022; Ord. No. 6324, § II, 9-15-2020; Ord. No. 6295, § I, 12-2-2019; Ord. No. 6185, § I(c), 11-15-2016; Ord. No. 6135, §§ I(a), (b), 10-20- 2015; Ord. No. 6048, § I(d), 11-5-2013; Ord. No. 5904, § I, 11-2-2010; Ord. 5754, § 1(l), 2007; Ord. No. 5666, § 1(a)—(b), 2006; Ord. No. 5603, § 1(a), 2005; Ord. No. 5402, § 1, 2003; Ord. No. 5374, § 1(a), 2002; Ord. No. 5167, § 1(i), 1999; Ord. No. 5086, § 1, 1997; Ord. No. 4959, §§ 1, 2, 1996; Ord. No. 4941, § 4, 1996; Ord. No. 4906, § 3 (part), 1995.)