8950.5. - AMENDMENT.

Section R309.3 of the 2025 California Residential Code is deleted in its entirety and amended to read as follows due to local climatic, geographical, and topographical conditions:

R309.3. DWELLING UNIT FIRE SPRINKLER SYSTEMS. Dwelling unit fire sprinkler systems shall be designed and installed in accordance with NFPA 13D or NFPA 13R as amended by this section.

R309.3.1 NFPA 13R SPRINKLER SYSTEMS. Where allowed in buildings of Group R, up to and including buildings four stories in height, automatic sprinkler systems shall be installed throughout in accordance with NFPA 13R with the following additions:

A)

Attics shall be fully sprinklered with quick-response intermediate temperature heads.

B)

Private garages shall be sprinklered and shall have a design density of an Ordinary Hazard Group 1 occupancy with a design area of two (2) heads. Quick-response intermediate temperature commercial type heads shall be used for the garage area.

R309.3.2 NFPA 13D SPRINKLER SYSTEMS. Where allowed, automatic sprinkler systems installed in oneand two-family dwellings shall be installed throughout in accordance with NFPA 13D with the following additions:

A)

Attics containing forced air units shall have one or more quick-response intermediate temperature sprinkler heads adjacent to each unit.

B)

Attached private garages shall be sprinklered and shall have a design density of an Ordinary Hazard Group 1 occupancy with a design area of two (2) heads. Quick-response intermediate temperature commercial type heads shall be used for the garage area.

C)

Detached private garages over 1000 square feet in total area shall be sprinklered and shall have a design density of an Ordinary Hazard Group 1 occupancy with a design area of 2 heads. Quick-response intermediate temperature commercial type heads shall be used for the garage area.

D)

Residential structures under 5000 square feet in total area shall be designed for two (2) heads flowing in the residential area. Residential structures over 5000 square feet in total area shall be designed for four (4) heads flowing in the residential area.

E)

Attics and basements used for storage purposes shall be fully sprinklered with residential type heads.

F)

A single exterior bell activated by the waterflow switch shall be provided at an approved location.

G)

A representative sample of spare heads shall be provided at an approved location.

(Ord. No. 2366, § 9, 12-17-19; Ord. No. 2394, § 9, 11-15-22; Ord. No. 2408, § 9, 11-18-25)

Editor's note— Ord. No. 2408, § 9, adopted November 18, 2025, repealed § 8950.5.1 which pertained to an amendment to the California Residential Code and derived from Ord. No. 2366, adopted December 17, 2019; and Ord. No. 2394, adopted November 15, 2022.

Editor's note— Ord. No. 2408, § 9, adopted November 18, 2025, repealed § 8950.5.2 which pertained to an amendment to the California Residential Code and derived from Ord. No. 2366, adopted December 17, 2019; and Ord. No. 2394, adopted November 15, 2022.

Editor's note— Ord. No. 2408, § 9, adopted November 18, 2025, repealed § 8950.5.3 which pertained to an addition to the California Residential Code and derived from Ord. No. 2366, adopted December 17,

2019; and Ord. No. 2394, adopted November 15, 2022.