Chapter 15.07 — RESIDENTIAL CODE

This chapter shall be cited as the "residential code of the City of Norco" and any reference in the City's municipal code or any chapter thereof to the California Residential Code, or other residential code, refers and applies to this chapter.

(Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 972 Sec. 6, 2014)

• A. Subject to the particular additions, amendments and deletions set forth in this chapter, all the rules, regulations, provisions and conditions set forth in that certain document being marked and designated as 2025 California Residential Code, including Appendix H, is hereby adopted as the residential code of the City of Norco.

• B. Chapter 1, Division II, is not adopted.

• C. Appendix Chapters A, B, C, D, E, F, G, I, J, K, L, M, N, O, P and Q are not adopted as part of this code.

• D. One certified copy of the 2025 California Residential Code, subject to the changes contained in this chapter, shall be kept on file in the office of the Building Official pursuant to Health and Safety Code Sections 18942(d) and (e)(1), and made available for public inspection. Each and all of the regulations, provisions, penalties, conditions and terms thereof are referred to, adopted and made a part of this chapter, as though fully set forth at length.

(Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 972 Sec. 6, 2014; Ord. 1012 Sec. 1, 2017; Ord. 1054 Sec. 1, 2019; Ord. 1089 Sec. 1, 2022; Ord. 1134, 10/15/2025)

The administrative procedures as adopted in Chapter 15.01 shall apply to this chapter. (Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 972 Sec. 6, 2014; Ord. 1134, 10/15/2025)

Designated sections of the 2025 California Residential Code are amended to read as set forth in this section through Section 15.07.060.

(Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 972 Sec. 6, 2014; Ord. 1054 Sec. 1, 2019; Ord. 1089 Sec. 1, 2022; Ord. 1134, 10/15/2025)

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City of Norco, CA

BUILDINGS AND CONSTRUCTION

§ 15.07.040.1

Table R301.2(1) is hereby amended, by the deletion of Table R301.2(1) and the addition of a new Table R301.2(1) thereto, to read as follows:

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TABLE R301.2(1)
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
WIND DESIGN SUBJECT TO DAMAGE FROM
Ice Barrier
Special Seismic Winter Under- Mean
Speed Topo-graphic Windl Wind borne Design Frost lineb Design Layment Flood Air Freezing Annual
Ground Snow Loado mphd effectsk Region debris zonem Categoryf Weatheringa Depth Termitec Tempe Requiredh Hazardsg Indexi Tempj
Zero 102 Exposure B Yes No D2 or E Negligible 12-24" Very Heavy 43 No Yes 0 63
MANUAL J DESIGN CRITERIAn
Altitude Correction Indoor Design Design Temperature Heat Temperature
Elevation Latitude Winter Heating Summer Cooling Factor Temperature Cooling Difference
709 33.931 28 99 N/A 70 75 —
Cooling Temperature
Difference Wind Velocity Heating Wind Velocity Cooling Coincident Wet Bulb Daily Range Winter Humidity Summer Humidity
7 — — 69 27 — 7 (50% RH)
Notes:
For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.
a. Where weathering requires a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code, the frost line depth strength required for
weathering shall govern. The weathering column shall be filled in with the weathering index, "negligible," "moderate" or "severe" for concrete as determined from Figure R301.2(1). The
grade of masonry units shall be determined from ASTM C34, ASTM C55, ASTM C62, ASTM C73, ASTM C90, ASTM C129, ASTM C145, ASTM C216 or ASTM C652.
b. Where the frost line depth requires deeper footings than indicated in Figure R403.1(1), the frost line depth strength required for weathering shall govern. The jurisdiction shall fill in the
frost line depth column with the minimum depth of footing below finish grade.
c. The jurisdiction shall fill in this part of the table to indicate the need for protection depending on whether there has been a history of local subterranean termite damage.
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City of Norco, CA

§ 15.07.040.1

§ 15.07.040.1

NORCO CODE

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Notes:
d. The jurisdiction shall fill in this part of the table with the wind speed from the ultimate design wind speeds map [Figure R301.2(2)]. Wind exposure category shall be determined on a
site-specific basis in accordance with Section R301.2.1.4.
e. The jurisdiction shall fill in this section of the table to establish the design criteria using Table 10A from ACCA Manual J or established criteria determined by the jurisdiction.
f. The jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1.
g. The jurisdiction shall fill in this part of the table with: the date of the jurisdiction's entry into the National Flood Insurance Program (date of adoption of the first code or ordinance
for management of flood hazard areas); and the title and date of the currently effective Flood Insurance Study or other flood hazard study and maps adopted by the authority having
jurisdiction, as amended.
h. In accordance with Sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming, the
jurisdiction shall fill in this part of the table with "YES." Otherwise, the jurisdiction shall fill in this part of the table with "NO."
i. The jurisdiction shall fill in this part of the table with the 100-year return period air freezing index (BF-days) from Figure R403.3(2) or from the 100-year (99 percent) value on the
National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32°F)."
j. The jurisdiction shall fill in this part of the table with the mean annual temperature from the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32°F)."
k. In accordance with Section R301.2.1.5, where there is local historical data documenting structural damage to buildings due to topographic wind speed-up effects, the jurisdiction shall fill
in this part of the table with "YES." Otherwise, the jurisdiction shall indicate "NO" in this part of the table.
l. In accordance with Figure R301.2(2), where there is local historical data documenting unusual wind conditions, the jurisdiction shall fill in this part of the table with "YES" and identify
any specific requirements. Otherwise, the jurisdiction shall indicate "NO" in this part of the table.
m. In accordance with Section R301.2.1.2 the jurisdiction shall indicate the wind-borne debris wind zone(s). Otherwise, the jurisdiction shall indicate "NO" in this part of the table.
n. The jurisdiction shall fill in these sections of the table to establish the design criteria using Table 1a or 1b from ACCA Manual J or established criteria determined by the jurisdiction.
o. The jurisdiction shall fill in this section of the allowable stress design table using the Ground Snow Loads in Figure R301.2(3).
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(Ord. 1134, 10/15/2025)

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City of Norco, CA

BUILDINGS AND CONSTRUCTION

§ 15.07.070

Section R902.1 (CBC Part 2 Volume 1) is amended by adding new subsection R902.1.5 (CBC Part 2 Volume 1) thereto as follows:

R902.1.5 (CBC, Part 2 Volume 1) Class A Roof Covering Requirement. Notwithstanding any other provision of this Building Code and Appendices to the contrary, Class A roof covering, as defined in Chapter 15 of the 2025 California Building Code, shall be applied:

1. To any building hereinafter constructed.

2. To any re-roofing of existing buildings, when fifty percent (50%) or more of the existing roof is replaced or overlaid within a 1-year period.

3. To any room additions where the aggregate area of the new roof exceeds fifty percent (50%) of the aggregate area of the existing roof.

(Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 1012 Sec. 1, 2017; Ord. 1054 Sec. 1, 2019; Ord. 1089 Sec. 1, 2022; Ord. 1134, 10/15/2025)

Section R902 (CBC Part 2 Volume 1) is amended by adding new subsection R902.5 (CBC Part 2 Volume 1) thereto as follows:

R902.5 (CBC, Part 2 Volume 1) Class A Roof Covering Requirement. Notwithstanding any other provision of this Building Code and Appendices to the contrary, Class A roof covering, as defined in Chapter 15 of the 2025 California Building Code, shall be applied:

1. To any building hereinafter constructed.

2. To any re-roofing of existing buildings, when fifty percent (50%) or more of the existing roof is replaced or overlaid within a 1-year period.

3. To any room additions where the aggregate area of the new roof exceeds fifty percent (50%) of the aggregate area of the existing roof.

(Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 1012 Sec. 1, 2017; Ord. 1054 Sec. 1, 2019; Ord. 1089 Sec. 1, 2022; Ord. 1134, 10/15/2025)

The violation and penalties for this chapter shall be as adopted in Chapter 15.01. (Ord. 937 Sec. 7 (Exh. G), 2011; Ord. 972 Sec. 6, 2014; Ord. 1134, 10/15/2025)

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City of Norco, CA