Section AK102
California Residential Code (Title 24, Part 2.5) · 2022 edition · updated 2026-09-12 · California
Italicized text is a California amendment to the model code, as printed in the official publication.
AK102.1 General.¶
Airborne sound insulation for wall and floor-ceiling assemblies shall meet a sound transmission class (STC) rating of 45 where tested in accordance with ASTM E90 or a Normalized Noise Isolation Class (NNIC) rating of 42 where tested in accordance with ASTM E336. Penetrations or openings in construction assemblies for piping; electrical devices; recessed cabinets; bathtubs; soffits; or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or otherwise treated to maintain the required ratings. Dwelling unit entrance doors, which share a common space, shall be tight fitting to the frame and sill.
AK102.1.1 Masonry. The sound transmission class of concrete masonry and clay masonry assemblies shall be calculated in accordance with TMS 0302 or determined through testing in accordance with ASTM E90.
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Ask AI about this code▸Contents — California Residential Code (Title 24, Part 2.5)
- Chapter 2 — DEFINITIONS AND ABBREVIATIONS
- Appendix AF — RADON CONTROL
- Appendix AI — PRIVATE SEWAGE
- Appendix AJ — EXISTING
- Appendix AK — SOUND
- Appendix AO — AUTOMATIC
- Appendix AR — LIGHT STRAW-CLAY
- Appendix AS — STRAWBALE
- Appendix AU — COB CONSTRUCTION
- Appendix AV — BOARD
- Appendix AW — 3D-PRINTED BUILDING
- Chapter 1 — SCOPE AND APPLICATION
- Chapter 3 — BUILDING PLANNING
- Chapter 4 — FOUNDATIONS
- Chapter 5 — FLOORS
- Chapter 6 — WALL CONSTRUCTION
- Chapter 7 — WALL COVERING
- Chapter 8 — ROOF-CEILING CONSTRUCTION
- Chapter 9 — ROOF ASSEMBLIES
- Chapter 10 — CHIMNEYS AND FIREPLACES
- Chapter 44 — REFERENCED STANDARDS
▸Appendix AH — PATIO COVERS
- Appendix AL — PERMIT FEES
- Appendix AQ — TINY HOUSES
- Appendix AT — SOLAR-READY PROVISIONS—DETACHED ONE- AND
- Appendix AX — SWIMMING POOL SAFETY ACT
- Appendix AY — AREAS PROTECTED BY THE FACILITIES
- Appendix AZ — EMERGENCY HOUSING