The following sections of Chapter 3 of the California Residential Code, as adopted by Chapter 18.01 hereof, are added, deleted, or amended as follows.
(Ord. 25-5, 11/25/2025)
Section R301.1.3.2 is amended to read as follows:
R301.1.3.2 Woodframe structures. The building official shall require structural construction documents to be approved and stamped by a California licensed architect or engineer for all dwellings of woodframe construction more than one story in height or with a basement.
(Ord. 25-5, 11/25/2025)
Section R301.1.5 is added to read as follows:
R301.1.5 Seismic design provisions for buildings constructed on or into slopes steeper than one unit vertical in three units horizontal (33.3 percent slope). The structural design and construction of new buildings and additions to existing buildings when constructed on or into slopes steeper than one unit vertical in three units horizontal (33.3 percent slope) shall comply with the California Building Code.
(Ord. 25-5, 11/25/2025)
Table R301.2 is amended as follows:
Table R301.2
Climatic and Geographic Design Criteria
For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s
a.
Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code. 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, C55, C62, C73, C90, C129, C145, C216 or C652.
b.
The frost line depth may require deeper footings than indicated in Figure R403.1(1). 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.
d.
The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed 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.
Temperatures shall be permitted to reflect local climates or local weather experience as determined by the building official.
f.
The jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1.
g.
Date of the jurisdiction's entry into the National Flood Insurance Program: April 25, 1980. Date of the Flood Insurance Study: June 2021. Panel numbers and dates of the currently effective FIRMs and FBFMs or other flood hazard map adopted by the authority having jurisdiction, as amended: all panels for Community 060729.
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 table using the Ground Snow Loads in Figure R301.2(3).
p.
Contact Building & Safety for information.
(Ord. 25-5, 11/25/2025)
Section R301.2.2 is amended as follows:
Buildings in Seismic Design Categories C, D, and E shall be designed to resist seismic loads in accordance with the California Building Code as amended by the City of Santa Clarita. Elements of the lateral force resisting system which are designed to resist seismic loads shall comply with the provisions of the California Building Code as amended by the City of Santa Clarita.
(Ord. 25-5, 11/25/2025)
Section R301.2.2.11 is added as follows:
R301.2.2.11 Anchorage of Mechanical, Electrical, or Plumbing Components and Equipment. Mechanical, electrical, or plumbing components and equipment shall be anchored to the structure in accordance with the requirements of ASCE 7 Chapter 13.
(Ord. 25-5, 11/25/2025)
Section R306.1 is amended as follows:
R306.1 General. Buildings and structures constructed in whole or in part in flood hazard areas established in Table R301.2, and substantial improvement and repair or restoration of substantial damage of buildings and structures located in whole or in part in flood hazard areas, shall be designed and constructed in accordance with the provisions contained in this section and Chapter 10.06 Floodplain Management of the SCMC. Where this section and Chapter 10.06 Floodplain Management of the SCMC conflict, Chapter 10.06 Floodplain Management of the SCMC shall prevail. Buildings and structures that are located in more than one flood hazard area, including A Zones, shall comply with the provisions associated with the most restrictive flood hazard area. Buildings and structures located in whole or in part in identified floodways shall be designed and constructed in accordance with ASCE 24 and Chapter 10.06 Floodplain Management of the SCMC. Where ASCE 24 and Chapter 10.06 Floodplain Management of the SCMC conflict, Chapter 10.06 Floodplain Management of the SCMC shall prevail.
(Ord. 25-5, 11/25/2025)
Section R306.2.1 is amended as follows:
Condition 1 is amended as follows:
1. Buildings and structures in flood hazard areas shall have the lowest floors elevated to the base flood elevation plus 1 foot.
Condition 3 is amended as follows:
3. Basement floors that are below grade on all sides shall be elevated to the base flood elevation plus 1 foot.
Exception is amended as follows:
Exception: Enclosed areas below the design flood elevation shall meet the requirements of Section R306.2.2
(Ord. 25-5, 11/25/2025)
Section R306.2.2 is amended as follows:
Condition 2.1.1 is added as follows:
2.1.1 The engineered opening shall be certified by the Federal Emergency Management Agency (FEMA).
(Ord. 25-5, 11/25/2025)