1505.1 General.

Roof assemblies shall be minimum Class A roof assemblies. Class A roof assemblies

and roof coverings required to be listed by this section shall be tested in accordance with ASTM E108 or

UL 790. In addition, Zre-retardant-treated wood roof coverings shall be tested in accordance with ASTM

D2898.

Exception: Skylights and sloped glazing that comply with Chapter 24 or Section 2610.

Table 1505.1 is deleted.

The Petaluma Municipal Code is current through Ordinance 2916 NCS, passed December 1, 2025.

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Section 1505.1.1 is amended to read as follows, with the exception deleted:

1505.1.1 Roof coverings within very-high Kre hazard severity zones, state responsibility areas and

all other areas. The entire roof covering of every existing structure where more than 50 percent of the

total roof area is replaced within any one-year period, the entire roof covering of every new structure

and any roof covering applied in the alteration, repair or replacement of the roof of every existing

structure, shall be Zre-retardant covering that is at least Class A.

Sections 1505.1.2 and 1505.1.3 are deleted.

Sections 1505.3, 1505.4, and 1505.5 are deleted.

Section 1505.6 is amended to add the following exception:

Exception: Fire-retardant-treated wood shingles and shakes are prohibited in wildland-urban interface

areas.

Table 1505.7 is amended to add the following exception:

Exception: Fire-retardant-treated wood shingles and shakes are prohibited in wildland-urban interface

areas.

Chapter 18 Soils and Foundations

Section 1803.1.1.1 is amended as follows:

A preliminary soil report, prepared by a civil engineer who is registered by the state shall be provided for

each subdivision. The report shall be based upon adequate test borings or excavations, of every

subdivision, where a tentative and Znal map is required pursuant to Section 66426 of the Government

Code.

The preliminary soil report may be waived if the building department of the city, county, or city and

county, or other enforcement agency charged with the administration and enforcement of the provisions

of Section 1803.1.1, shall determine that, due to the knowledge such department has as to the soil

qualities of the soil of the subdivision or lot, no preliminary analysis is necessary.

Section 1803.1.1.2 is amended as follows:

The Petaluma Municipal Code is current through Ordinance 2916 NCS, passed December 1, 2025.

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1803.1.1.2. Soil investigation by lot, necessity, preparation and recommendations. If the

preliminary soil report indicates the presence of critically expansive soils or other soil problems which, if

not corrected, would lead to structural defects, a soil investigation of each lot in the subdivision is

required.

The soil investigation shall be prepared by a civil engineer who is registered in this state. It shall

recommend corrective action which is likely to prevent structural damage to each dwelling proposed to

be constructed on the site where hazardous soil conditions are present. For each speciZc construction

site or lot, the geotechnical engineer shall provide such investigation and recommendations, or letter of

exemption from this section.

1803.1.1.3. Approval, building permit conditions, appeal.

The building department or other enforcement agency charged with the administration and

enforcement of the provisions of Section 1803.1.1, shall approve the soil investigation if it determines

that the recommended action is likely to prevent structural damage to each dwelling to be constructed. A

condition to the building permit, shall require that the approved recommended action be incorporated

in the construction of each dwelling. Appeal from such determination shall be to the local appeals board.

Part 2.5 of the 2025 California Building Standards Code, California Residential Code, as adopted in Section

17.04.010, is hereby amended to include the following additions, amendments, and deletions:

California Residential Code

Chapter 1 Administration

Section R105.2 is hereby amended to read as follows:

R105.2. Building 1. One-story detached accessory structures used as tool and storage sheds, playhouses

and similar uses, provided the [oor area is not greater than one hundred twenty square feet (120 sq.) (11 m2), there are no wall Znishes such as, but not limited to, gypsum wallboard, plaster, stucco, or

paneling placed on any interior surface of any wall and/or partition, and no electrical, mechanical or

plumbing systems are contained within the structure. These structures are still regulated by Section

710A, despite exemption from permit.

Section R109.3 is amended to read as follows:

The applicant for a permit shall provide an estimated value of the work for which the permit is being

issued at time of application. Such estimated valuation shall include the total value of work, including

materials and labor, for which the permit is being issued, such as electrical, gas, mechanical, plumbing

The Petaluma Municipal Code is current through Ordinance 2916 NCS, passed December 1, 2025.

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equipment and permanent systems. Where, in the opinion of the building o\cial, the valuation is

underestimated, the permit shall be denied, unless the applicant can show detailed estimates acceptable

to the building o\cial. The building o\cial shall have the authority to adjust the Znal valuation for permit

fees

Sections R114.1 and R114.2 are hereby amended to read as follows. A new Section R114.5 is created:

R114.1 Authority. Where the building o\cial Znds any work regulated by this code being performed in a

manner contrary to the provisions of this code or in a dangerous or unsafe manner, without a permit,

beyond the scope of the issued permit, in violation of the Petaluma Municipal Code or Zoning Ordinance,

the building o\cial is authorized to issue a stop work order.

R114.2 Issuance. The stop work order shall be in writing, be posted in a visible location near the location

where the work is being conducted, and shall be given to the owner of the property, the owner’s

authorized agent or the person performing the work. Upon issuance of a stop work order, the cited work

shall immediately cease. The stop work order shall state the reason for the order and the conditions

under which the cited work is authorized to resume.

R114.5 Fee. An additional investigation fee of at least the permit fee and up to Zve times the permit fee

shall be added to each permit subject to a stop work order or notice of violation, according to the

building o\cial’s determination. Licensed contractors and repeat o]enders are to be assessed

investigation fee at Zve times the permit fee.