ADOPTS WITH AMENDMENTS:

International Building Code 2018 (IBC 2018)

Heads up: There are no amended sections in this chapter.

Chapter 12 Interior Environment

AMENDMENT
This section has been amended at the state or city level.
CALIFORNIA BUILDING CODE — MATRIX ADOPTION TABLE CHAPTER 12 — INTERIOR ENVIRONMENT

(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
Adopting agency BSC BSC-CG SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC
1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5
Adopt entire chapter X X
Adopt entire chapter as
amended (amended
sections listed below)
X X X X X X X X X
Adopt only those sections
that are listed below
X X X X X X
Chapter / Section
1202.1 X X
1202.2.1 X X
1202.3 X X
Table 1202.3 X X
1202.4.1.3 X
1202.5 X X
1202.5.2.1 X X
1202.6 X
1203.1, Exceptions 2 & 4 X X
1203.1, Exception 3 X X X X X X
1203.4.1.1 X
1203.4.2 X
1204.1 X X
1204.6 X
1204.7 X
1204.7.1 X
1205 X
1206.3, Exception X X
1206.4 X X
1206.5 X
1207.1 X
1207.2 X X X X X X
1207.4 X
1208 X
1208.1.1 X
1209.2 X X X X X X
1210-1210.6 X X
1211 X
Table 1224.4.6.5 X X X X X X
1224 X X
1225 X
1226 X
1227 X
1228 X
1230 X
1231 X
1235 X
1236 X
1237 X
1240 X
1241 X
1242 X
1243 X
1250 X
1251 X
1252 X
1253 X
1254 X
The Office of the State Fire Marshal's adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

User note:
About this chapter: Chapter 12 provides minimum provisions for the interior of buildings—the occupied environment. Ventilation, lighting, and space heating are directly regulated in this chapter and in conjunction with the California Mechanical Code® and the California Energy Code®. Minimum room size and maximum room-to-room sound transmission are set for certain occupancies.


The provisions of this chapter shall govern ventilation, temperature control, lighting, yards and courts, sound transmission, room dimensions, surrounding materials and rodentproofing associated with the interior spaces of buildings.

1202.1 General

AMENDMENT
This section has been amended at the state or city level.

Buildings shall be provided with natural ventilation in accordance with Section 1202.5, or mechanical ventilation in accordance with the California Mechanical Code.

Roof assemblies shall be ventilated in accordance with this section or shall comply with Section 1202.3.

1202.2.1 Ventilated Attics and Rafter Spaces

AMENDMENT
This section has been amended at the state or city level.

Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing members shall have cross ventilation for each separate space by ventilation openings protected against the entrance of rain and snow. Blocking and bridging shall be arranged so as not to interfere with the movement of air. An airspace of not less than 1 inch (25 mm) shall be provided between the insulation and the roof sheathing. The net free ventilating area shall be not less than 1/150 of the area of the space ventilated. Ventilators shall be installed in accordance with manufacturer's installation instructions.


Exception: The net free cross-ventilation area shall be permitted to be reduced to 1/300 provided both of the following conditions are met:

  1. In Climate Zones 14 and 16, a Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling.
  2. At least 40 percent and not more than 50 percent of the required venting area is provided by ventilators located in the upper portion of the attic or rafter space. Upper ventilators shall be located not more than 3 feet (914 mm) below the ridge or highest point of the space, measured vertically, with the balance of the ventilation provided by eave or cornice vents. Where the location of wall or roof framing members conflicts with the installation of upper ventilators, installation more than 3 feet (914 mm) below the ridge or highest point of the space shall be permitted.

1202.2.2 Openings Into Attic

AMENDMENT
This section has been amended at the state or city level.
Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds, squirrels, rodents, snakes and other similar creatures. Openings for ventilation having a least dimension of not less than 1/16 inch (1.6 mm) and not more than 1/4 inch (6.4 mm) shall be permitted. Openings for ventilation having a least dimension larger than 1/4 inch (6.4 mm) shall be provided with corrosion-resistant wire cloth screening, hardware cloth, perforated vinyl or similar material with openings having a least dimension of not less than 1/16 inch (1.6 mm) and not more than 1/4 inch (6.4 mm). Where combustion air is obtained from an attic area, it shall be in accordance with Chapter 7 of the California Mechanical Code.

1202.3 Unvented Attic and Unvented Enclosed Rafter Assemblies

AMENDMENT
This section has been amended at the state or city level.

Unvented attics and unvented enclosed roof framing assemblies created by ceilings applied directly to the underside of the roof framing members/rafters and the structural roof sheathing at the top of the roof framing members shall be permitted where all of the following conditions are met:

  1. The unvented attic space is completely within the building thermal envelope.
  2. No interior Class I vapor retarders are installed on the ceiling side (attic floor) of the unvented attic assembly or on the ceiling side of the unvented enclosed roof framing assembly.
  3. Where wood shingles or shakes are used, not less than a 1/4-inch (6.4 mm) vented airspace separates the shingles or shakes and the roofing underlayment above the structural sheathing.
  4. In Climate Zones 14 and 16, any air-impermeable insulation shall be a Class II vapor retarder or shall have a Class II vapor retarder coating or covering in direct contact with the underside of the insulation.

    See the California Energy Code, Figure 100.1-A — California Climate Zones.
    1. 4.1. [HCD 1 & HCD 2] In Climate Zones 14 and 16, a Class I or Class II vapor retarder shall be installed on the indirectly conditioned space side of all insulation in an unvented attic with air-permeable insulation, for condensation control.
  5. Insulation shall be located in accordance with the following:

    1. 5.1. Item 5.1.1, 5.1.2, 5.1.3 or 5.1.4 shall be met, depending on the air permeability of the insulation directly under the structural roof sheathing. No insulation shall be required when roof tiles, wood shingles or wood shakes, or any other roofing system using battens and no continuous underlayment is installed. A continuous underlayment shall be considered to exist if sheathing, roofing paper or any continuous layer having a perm rate of no more than one perm under the dry cup method is present.

      1. 5.1.1. Where only air-impermeable insulation is provided, it shall be applied in direct contact with the underside of the structural roof sheathing.
      2. 5.1.2. Where air-permeable insulation is provided inside the building thermal envelope, it shall be installed in accordance with Item 5.1.1. In addition to the air-permeable insulation installed directly below the structural sheathing, rigid board or sheet insulation shall be installed directly above the structural roof sheathing in accordance with the R-values in Table 1202.3 for condensation control.
      3. 5.1.3. Where both air-impermeable and air-permeable insulation are provided, the air-impermeable insulation shall be applied in direct contact with the underside of the structural roof sheathing and shall be in accordance with the R-values in Table 1202.3 for condensation control. The air-permeable insulation shall be installed directly under the air-impermeable insulation.
      4. 5.1.4. Alternatively, sufficient rigid board or sheet insulation shall be installed directly above the structural roof sheathing to maintain the monthly average temperature of the underside of the structural roof sheathing above 45°F (7°C). For calculation purposes, an interior air temperature of 68°F (20°C) is assumed and the exterior air temperature is assumed to be the monthly average outside air temperature of the three coldest months.
    2. 5.2. Where preformed insulation board is used as the air-impermeable insulation layer, it shall be sealed at the perimeter of each individual sheet interior surface to form a continuous layer.

Exceptions:

  1. Section 1202.3 does not apply to special use structures or enclosures such as swimming pool enclosures, data processing centers, hospitals or art galleries.
  2. Section 1202.3 does not apply to enclosures in Climate Zones 14 and 16 that are humidified beyond 35 percent during the three coldest months.
TABLE 1202.3
INSULATION FOR CONDENSATION CONTROL
CLIMATE ZONEMINIMUM R-VALUE OF AIR-IMPERMEABLE INSULATIONa
6-15 tile roof only0 (none required)
3-15R-5
1 & 2R-10
16R-15
  1. Contributes to, but does not supersede, thermal resistance requirements for attic and roof assemblies in the California Energy Code.
The space between the bottom of the floor joists and the earth under any building except spaces occupied by basements or cellars shall be provided with ventilation in accordance with Section 1202.4.1, 1202.4.2 or 1202.4.3.

Ventilation openings through foundation walls shall be provided. The openings shall be placed so as to provide cross ventilation of the under-floor space. The net area of ventilation openings shall be in accordance with Section 1202.4.1.1 or 1202.4.1.2. Ventilation openings shall be covered for their height and width with any of the following materials, provided that the least dimension of the covering shall be not greater than 1/4 inch (6.4 mm):

  1. Perforated sheet metal plates not less than 0.070 inch (1.8 mm) thick.
  2. Expanded sheet metal plates not less than 0.047 inch (1.2 mm) thick.
  3. Cast-iron grilles or gratings.
  4. Extruded load-bearing vents.
  5. Hardware cloth of 0.035-inch (0.89 mm) wire or heavier.
  6. Corrosion-resistant wire mesh, with the least dimension not greater than 1/8 inch (3.2 mm).
  7. Operable louvres, where ventilation is provided in accordance with Section 1202.4.1.2.
The net area of ventilation openings for crawl spaces with uncovered earth floors shall be not less than 1 square foot for each 150 square feet (0.67 m2 for each 100 m2) of crawl space area.
The net area of ventilation openings for crawl spaces with the ground surface covered with a Class I vapor retarder shall be not less than 1 square foot for each 1,500 square feet (0.67 m2 for each 1000 m2) of crawl space area.

1202.4.1.3

AMENDMENT
This section has been amended at the state or city level.
[SPCB] Openings for under-floor ventilation shall be not less than 11/2 square feet (0.135 m2) for each 25 linear feet (7620 linear mm) of exterior wall. They shall be covered with corrosion-resistant wire mesh with mesh openings not less than 1/4 inch (6.4 mm) nor more than 1/2 inch (13 mm) in any dimension.
In extremely cold climates, where a ventilation opening will cause a detrimental loss of energy, ventilation openings to the interior of the structure shall be provided.
Mechanical ventilation shall be provided to crawl spaces where the ground surface is covered with a Class I vapor retarder. Ventilation shall be in accordance with Section 1202.4.3.1 or 1202.4.3.2.
Continuously operated mechanical ventilation shall be provided at a rate of 1.0 cubic foot per minute (cfm) for each 50 square feet (1.02 L/s for each 10 m2) of crawl space ground surface area and the ground surface shall be covered with a Class I vapor retarder.

1202.4.3.2 Conditioned Space

AMENDMENT
This section has been amended at the state or city level.
The crawl space shall be conditioned in accordance with the California Mechanical Code and the walls of the crawl space shall be insulated in accordance with the California Energy Conservation Code.
For buildings in flood hazard areas as established in Section 1612.3, the openings for under-floor ventilation shall be deemed as meeting the flood opening requirements of ASCE 24 provided that the ventilation openings are designed and installed in accordance with ASCE 24.

1202.5 Natural Ventilation

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION
Natural ventilation of an occupied space shall be through windows, doors, louvers or other openings to the outdoors. The operating mechanism for such openings shall be provided with ready access so that the openings are readily controllable by the building occupants.

In other than high-rise buildings, public corridors, public hallways and other public spaces having openings into adjoining dwelling units, guest rooms, or congregate residences within R-1 and R-2 Occupancies, shall be provided with natural ventilation by means of openable exterior openings with an area of not less than 1/25 of the floor area of such rooms or spaces with a minimum of 4 square feet (0.37 m2).

In lieu of required exterior openings for natural ventilation, a mechanical ventilating system may be provided. Such system shall be capable of providing two air changes per hour in public corridors, public hallways and other public spaces having openings into adjoining dwelling units, guest rooms, or congregate residences with R-2 occupancies, with a minimum of 7-1/2 cubic feet per minute (3-1/2 L/s) of outside air per occupant during such time as the building is occupied.

[HCD 1] In employee housing, all openable windows in rooms used for living, dining, cooking or sleeping purposes, and toilet and bath buildings, shall be provided and maintained with insect screening.

[HCD 1] Door openings of rooms used for dining, cooking, toilet and bathing facilities in employee housing shall be provided and maintained with insect screening or with solid doors equipped with self-closing devices in lieu thereof, when approved by the enforcement agency.

[HCD 1] The windows, doors, louvers or other approved closeable openings not required by Section 1030 may open into a passive solar energy collector for ventilation required by this section. The area of ventilation openings to the outside of the passive solar energy collector shall be increased to compensate for the openings required by the interior space.
The openable area of the openings to the outdoors shall be not less than 4 percent of the floor area being ventilated.

Where rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the opening to the adjoining room shall be unobstructed and shall have an area of not less than 8 percent of the floor area of the interior room or space, but not less than 25 square feet (2.3 m2). The openable area of the openings to the outdoors shall be based on the total floor area being ventilated.

Exception: Exterior openings required for ventilation shall be allowed to open into a sunroom with thermal isolation or a patio cover provided that the openable area between the sunroom addition or patio cover and the interior room shall have an area of not less than 8 percent of the floor area of the interior room or space, but not less than 20 square feet (1.86 m2). The openable area of the openings to the outdoors shall be based on the total floor area being ventilated.

Where openings below grade provide required natural ventilation, the outside horizontal clear space measured perpendicular to the opening shall be one and one-half times the depth of the opening. The depth of the opening shall be measured from the average adjoining ground level to the bottom of the opening.

1202.5.2 Contaminants Exhausted

AMENDMENT
This section has been amended at the state or city level.
Contaminant sources in naturally ventilated spaces shall be removed in accordance with the California Mechanical Code and the California Fire Code.

1202.5.2.1 Bathrooms

AMENDMENT
This section has been amended at the state or city level.
Rooms containing bathtubs, showers, spas and similar bathing fixtures shall be mechanically ventilated in accordance with the California Mechanical Code.

     The minimum exhaust rate shall not be less than that established by Table 403.7 "Minimum Exhaust Rates." See California Mechanical Code, Chapter 5, for additional provisions related to environmental air ducts.

[HCD 1] In addition to the requirements in this section and in the California Mechanical Code, bathrooms in Group R occupancies shall be mechanically ventilated in accordance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.5.
Where natural ventilation is to be provided by openings onto yards or courts, such yards or courts shall comply with Section 1205.

1202.6 Other Ventilation and Exhaust Systems

AMENDMENT
This section has been amended at the state or city level.
Ventilation and exhaust systems for occupancies and operations involving flammable or combustible hazards or other contaminant sources as covered in the California Mechanical Code or the California Fire Code shall be provided as required by both codes.

For all buildings containing any sensitive land use located within the Air Pollutant Exposure Zone, as determined by the Director of Public Health pursuant to Article 38 of the San Francisco Health Code, that are:
  1. Newly constructed;
  2. Undergoing a "Major Alteration to Existing Building" as defined by the San Francisco Green Building Code; or
  3. Applying for a San Francisco Planning Department-permitted Change of Use, such buildings shall incorporate an enhanced ventilation system designed and constructed to be in compliance with San Francisco Health Code Article 38.

1203.1 Equipment and Systems

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION

Interior spaces intended for human occupancy shall be provided with active or passive space heating systems capable of maintaining an indoor temperature of not less than 68°F (20°C) at a point 3 feet (914 mm) above the floor on the design heating day.


Exceptions:

  1. Space heating systems are not required for:
    1. Interior spaces where the primary purpose of the space is not associated with human comfort.
    2. Group F, H, S or U occupancies.
  2. [HCD 1] For limited-density owner-built rural dwellings, a heating facility or appliance shall be installed in each dwelling subject to the provisions of Subchapter 1, Chapter 1, Title 25, California Code of Regulations, commencing with Section 74; however, there shall be no specified requirement for heating capacity or temperature maintenance. The use of solid-fuel or solar-heating devices shall be deemed as complying with the requirements of this section. If nonrenewable fuel is used in these dwellings, rooms so heated shall meet current installation standards.
  3. [OSHPD 1, 1R, 2, 3, 4 & 5] Space heating systems shall comply with the requirements of the California Mechanical Code.
  4. [HCD 1] When a passive solar energy collector is designed as a conditioned area it shall comply with the California Energy Code. Nonconditioned passive solar energy collectors are exempt from compliance with the California Energy Code.

1204.1 General

AMENDMENT
This section has been amended at the state or city level.
Every space intended for human occupancy shall be provided with natural light by means of exterior glazed openings in accordance with Section 1204.2 or shall be provided with artificial light in accordance with Section 1204.3. Exterior glazed openings shall open directly onto a public way or onto a yard or court in accordance with Section 1205.
Exception: Habitable rooms (excluding kitchens, home offices and media rooms) within a dwelling unit or congregate residence shall be provided with natural light by means of exterior glazed openings in accordance with Section 1204.2.

[HCD 1] Glazed openings may open into a passive solar energy collector provided the area of exterior glazed openings in the passive solar energy collector is increased to compensate for the area required by the interior space.
The minimum net glazed area shall be not less than 8 percent of the floor area of the room served.

For the purpose of natural lighting, any room is permitted to be considered as a portion of an adjoining room where one-half of the area of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room or 25 square feet (2.32 m2), whichever is greater.

Exception: Openings required for natural light shall be permitted to open into a sunroom with thermal isolation or a patio cover where the common wall provides a glazed area of not less than one-tenth of the floor area of the interior room or 20 square feet (1.86 m2), whichever is greater.

1204.2.2 Exterior Openings

AMENDMENT
This section has been amended at the state or city level.

Exterior openings required by Section 1204.2 for natural light shall open directly onto a public way, yard or court, as set forth in Section 1205.


Exceptions:

  1. Required exterior openings are permitted to open into a roofed porch where the porch meets all of the following criteria:

    1. 1.1. Abuts a public way, yard or court.
    2. 1.2. Has a ceiling height of not less than 7 feet (2134 mm).
    3. 1.3. Has a longer side at least 65 percent open and unobstructed.
  2. Skylights are not required to open directly onto a public way, yard or court.
The depth of all structural projections, including balconies, decks, porches, rooms or roofs, shall not exceed 9 feet (2.134 m) when extending over exterior wall openings that provide required natural light or natural ventilation for spaces intended for human occupancy.

The height of a balcony, deck or porch shall not be less than 7 feet (2.134 m) measured from the floor to the lowest projection above.
Artificial light shall be provided that is adequate to provide an average illumination of 10 footcandles (107 lux) over the area of the room at a height of 30 inches (762 mm) above the floor level.

1204.4 Stairway Illumination

AMENDMENT
This section has been amended at the state or city level.
Stairways within dwelling units and exterior stairways serving a dwelling unit shall have an illumination level on tread runs and landings of not less than 1 footcandle (11 lux). Stairs in other occupancies shall be governed by Chapter 10.
Exception: An artificial light source is not required at the top and bottom landing, provided an artificial light source is located directly over each stairway section.

1204.4.1 Controls

AMENDMENT
This section has been amended at the state or city level.
The control for activation of the required stairway lighting shall be in accordance with the California Electrical Code.
The means of egress shall be illuminated in accordance with Section 1008.1.

1204.6 Light Pollution Reduction

AMENDMENT
This section has been amended at the state or city level.
[BSC-CG] See California Green Building Standards Code, Chapter 5, Division 5.1 for additional light pollution reduction requirements.
[BSC] Artificial light shall be provided for parking facilities and primary walkways at California State Universities, colleges and community colleges in accordance with provisions of this subsection. This subsection shall not apply to the University of California unless the Regents of the University of California, by resolution, make it applicable.

1204.7.1 Lighting Requirements

AMENDMENT
This section has been amended at the state or city level.
Based on the recommendations of the most current edition of the Illumination Engineering Society lighting handbook, the following lighting standards shall be used for all new construction of open parking facilities, covered parking facilities and primary walkways:
  1. Open and covered parking facilities.
    1. Medium-level activity usage when medium usage is present.
    2. High-level activity usage when high usage is present.
  2. Primary campus walkways.
    1. Medium-level activity usage when medium usage is present.
    2. High-level activity usage when high usage is present.
This section shall apply to yards and courts adjacent to exterior openings that provide natural light or ventilation. Such yards and courts shall be on the same lot as the building.

1205.2 Yards

ILLUSTRATION
Yards shall be not less than 3 feet (914 mm) in width for buildings two stories or less above grade plane. For buildings more than two stories above grade plane, the minimum width of the yard shall be increased at the rate of 1 foot (305 mm) for each additional story. For buildings exceeding 14 stories above grade plane, the required width of the yard shall be computed on the basis of 14 stories above grade plane.
Courts shall be not less than 3 feet (914 mm) in width. Courts having windows opening on opposite sides shall be not less than 6 feet (1829 mm) in width. Courts shall be not less than 10 feet (3048 mm) in length unless bounded on one end by a public way or yard. For buildings more than two stories above grade plane, the court shall be increased 1 foot (305 mm) in width and 2 feet (610 mm) in length for each additional story. For buildings exceeding 14 stories above grade plane, the required dimensions shall be computed on the basis of 14 stories above grade plane.
Access shall be provided to the bottom of courts for cleaning purposes.
Courts more than two stories in height shall be provided with a horizontal air intake at the bottom not less than 10 square feet (0.93 m2) in area and leading to the exterior of the building unless abutting a yard or public way.

1205.3.3 Court Drainage

AMENDMENT
This section has been amended at the state or city level.
The bottom of every court shall be properly graded and drained to a public sewer or other approved disposal system complying with the California Plumbing Code.
This section shall apply to common interior walls, partitions and floor/ceiling assemblies between adjacent dwelling units and sleeping units or between dwelling units and sleeping units and adjacent public areas such as halls, corridors, stairways or service areas.
Walls, partitions and floor-ceiling assemblies separating dwelling units and sleeping units from each other or from public or service areas shall have a sound transmission class of not less than 50, or not less than 45 if field tested, for airborne noise where tested in accordance with ASTM E90. Alternatively, the sound transmission class of walls, partitions and floor-ceiling assemblies shall be established by engineering analysis based on a comparison of walls, partitions and floor-ceiling assemblies having sound transmission class ratings as determined by the test procedures set forth in ASTM E90. 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. This requirement shall not apply to entrance doors; however, such doors shall be tight fitting to the frame and sill.
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.

1206.3 Structure-Borne Sound

AMENDMENT
This section has been amended at the state or city level.
Floor-ceiling assemblies between dwelling units and sleeping units or between a dwelling unit or sleeping unit and a public or service area within the structure shall have an impact insulation class rating of not less than 50, or not less than 45 if field tested, where tested in accordance with ASTM E492. Alternatively, the impact insulation class of floor-ceiling assemblies shall be established by engineering analysis based on a comparison of floor-ceiling assemblies having impact insulation class ratings as determined by the test procedures in ASTM E492.

Exception: Impact sound insulation is not required for floor-ceiling assemblies over nonhabitable rooms or spaces not designed to be occupied, such as garages, mechanical rooms or storage areas.

1206.4 Allowable Interior Noise Levels

AMENDMENT
This section has been amended at the state or city level.
Interior noise levels attributable to exterior sources shall not exceed 45 dB in any habitable room. The noise metric shall be either the day-night average sound level (Ldn) or the community noise equivalent level (CNEL), consistent with the noise element of the local general plan.

1206.5 Acoustical Control

AMENDMENT
This section has been amended at the state or city level.
[BSC-CG] See California Green Building Standards Code, Chapter 5, Division 5.5 for additional sound transmission requirements.

1206.6 Definitions

AMENDMENT
This section has been amended at the state or city level.
The following definitions apply to Sections 1206.4 through 1206.9 of this Code.

COMMUNITY NOISE EQUIVALENT LEVEL (CNEL) is a metric similar to the Ldn, except that a 5 dB adjustment is added to the equivalent continuous sound exposure level for evening hours (7 p.m. to 10 p.m.) in addition to the 10 dB nighttime adjustment used in the Ldn.

DAY-NIGHT AVERAGE SOUND LEVEL (Ldn) is the A-weighted equivalent continuous sound exposure level for a 24-hour period with a 10 dB adjustment added to sound levels occurring during nighttime hours (10 p.m. to 7 a.m.).

NORMALIZED A-WEIGHTED SOUND LEVEL DIFFERENCE (Dn) means for a specified source room sound spectrum, the difference, in decibels, between the average sound levels produced in two rooms after adjustment to the expected acoustical conditions when the receiving room under test is normally furnished.

1206.7 Exterior Sound Transmission Control

AMENDMENT
This section has been amended at the state or city level.

1206.7.1 Application

AMENDMENT
This section has been amended at the state or city level.
Residential structures located in noise critical areas, such as in proximity to highways, county roads, city streets, railroads, rapid transit lines, airports, nighttime entertainment venues, or industrial areas, shall be designed to prevent the intrusion of exterior noises beyond levels prescribed by the Municipal Code. Proper design to accomplish this goal shall include, but not be limited to, orientation of the residential structure, setbacks, shielding, and sound insulation of the building.

1206.7.2 Allowable Interior Noise Levels

AMENDMENT
This section has been amended at the state or city level.
Interior noise levels attributable to exterior sources shall not exceed 45 dB in any habitable room. The noise metric shall be either the day-night average sound level (Ldn) or the community noise equivalent level (CNEL), whichever results in a higher measurement of noise level.

1206.7.3 Other Noise Sources

AMENDMENT
This section has been amended at the state or city level.
Residential structures to be located where the Ldn or CNEL exceeds 60 dB shall require an acoustical analysis showing that the proposed design will limit exterior noise to the prescribed allowable interior level. The Planning Department's map titled Areas Potentially Requiring Noise Insulations, and similar maps and guidance produced by the Planning Department, shall be used where possible to identify sites with noise levels potentially greater than 60 dB.

1206.8 Compliance

AMENDMENT
This section has been amended at the state or city level.
  1. Evidence of compliance with Section 1206.7 shall consist of submittal of an acoustical analysis report, prepared under the supervision of a person experienced in the field of acoustical engineering, with the application for a building permit. The report shall show topographical relationships of noise sources and dwelling sites, identification of noise sources and their characteristics, predicted noise spectra and levels at the exterior of the proposed dwelling structure considering present and future land usage, the basis or bases for the prediction (measured or obtained from published data), noise attenuation measures to be applied and an analysis of the noise insulation effectiveness of the proposed construction showing that the prescribed interior noise level requirements are met.
  2. If interior allowable noise levels are met by requiring that windows be unopenable or closed the design for the structure must also specify a ventilation or air-conditioning system to provide a habitable interior environment. The ventilation system must not compromise the dwelling unit or guest room noise reduction.

1206.9 Field Testing

AMENDMENT
This section has been amended at the state or city level.
  1. When inspection indicates that the construction is not in accordance with the approved design, or that the noise reduction is compromised due to sound leaks or flanking paths, field testing may be required. A test report showing compliance or noncompliance with prescribed interior allowable levels shall be submitted to the building official.
  2. Field measurements of outdoor sound levels shall generally follow the guidelines prepared by the American Society for Testing and Materials (ASTM) in ASTM E1014.
  3. Field measurements of the A-weighted airborne sound insulation of buildings from exterior sources shall generally follow the guidelines prepared by the American Society for Testing and Materials (ASTM) in ASTM E966.
  4. For the purpose of this Section 1206.9, sound level differences measured in unoccupied units shall be normalized to a receiving room reverberation time of one-half second. Sound level differences measured in occupied units shall not be normalized to a standard reverberation time.

1206.10

AMENDMENT
This section has been amended at the state or city level.
The Department of Building Inspection shall consult with the Planning Department to ensure that notice to sponsors of residential development projects affected by Sections 1206.6 through 1206.9 are provided with notice of the requirements of this Section as soon as practicable in the project approval process.

1207.1 Minimum Room Widths

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION
Habitable spaces, other than a kitchen, shall be not less than 7 feet (2134 mm) in any plan dimension. Kitchens shall have a clear passageway of not less than 3 feet (914 mm) between counter fronts and appliances or counter fronts and walls.

[HCD 1] For limited-density owner-built rural dwellings, there shall be no requirements for room dimensions, provided there is adequate light and ventilation and adequate means of egress.

1207.2 Minimum Ceiling Heights

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION

Occupiable spaces, habitable spaces and corridors shall have a ceiling height of not less than 7 feet 6 inches (2286 mm) above the finished floor. Bathrooms, toilet rooms, kitchens, storage rooms and laundry rooms shall have a ceiling height of not less than 7 feet (2134 mm) above the finished floor.


Exceptions:

  1. In one- and two-family dwellings, beams or girders spaced not less than 4 feet (1219 mm) on center shall be permitted to project not more than 6 inches (152 mm) below the required ceiling height.
  2. If any room in a building has a sloped ceiling, the prescribed ceiling height for the room is required in one-half the area thereof. Any portion of the room measuring less than 5 feet (1524 mm) from the finished floor to the ceiling shall not be included in any computation of the minimum area thereof.
  3. The height of mezzanines and spaces below mezzanines shall be in accordance with Section 505.2.
  4. Corridors contained within a dwelling unit or sleeping unit in a Group R occupancy shall have a ceiling height of not less than 7 feet (2134 mm) above the finished floor.
  5. [OSHPD 1, 1R, 2, 3 & 5] Minimum ceiling heights shall comply with Section 1224.4.10.
  6. [OSHPD 4] Minimum ceiling heights shall comply with Section 1227.8.
Any room with a furred ceiling shall be required to have the minimum ceiling height in two-thirds of the area thereof, but in no case shall the height of the furred ceiling be less than 7 feet (2134 mm).

1207.3 Room Area

ILLUSTRATION

Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m2) of net floor area. Other habitable rooms shall have a net floor area of not less than 70 square feet (6.5 m2).

Exception: Kitchens are not required to be of a minimum floor area.

1207.4 Efficiency Dwelling Units

AMENDMENT
This section has been amended at the state or city level.
Efficiency dwelling units shall comply with the following:
  1. The unit shall be occupied by no more than two persons and have a living room of not less than 150 square feet of floor area. An additional 100 square feet (9.3 m2) of floor area shall be provided for each occupant of such unit in excess of two.
  2. The unit shall be provided with a separate closet.
  3. The unit shall be provided with a kitchen sink, cooking appliance and refrigeration facilities, each having a clear working space of not less than 30 inches (762 mm) in front. Light and ventilation conforming to this code shall be provided.
  4. The unit shall be provided with a separate bathroom containing a water closet, lavatory and bathtub or shower.
  5. The total area of the unit shall be no less than 220 square feet, which area shall be measured from the inside perimeter of the exterior walls of the unit and shall include closets, bathrooms, kitchen, living, and sleeping areas.
  6. Subsections 1 - 5 apply only to new construction of a structure or building. For purposes of the preceding sentence, new construction shall mean the creation of an entirely new structure or building and shall not apply to improvement, renovation, rehabilitation, or any other change to an existing structure or building. Existing buildings or structures are subject only to Subsections 1 - 4 except that for purposes of Subsection 1 the unit shall have a living room of not less than 220 square feet (20.4 m2) of floor area for up to two occupants.
Crawl spaces shall be provided with not less than one access opening that shall be not less than 18 inches by 24 inches (457 mm by 610 mm).

1208.1.1

AMENDMENT
This section has been amended at the state or city level.
[SPCB] Accessible under-floor areas shall be provided with an 18-inch by 24-inch (457 mm by 610 mm) access crawl hole. Pipes, ducts and other nonstructural construction shall not interfere with the accessibility to or within under-floor areas.

1208.2 Attic Spaces

ILLUSTRATION
An opening not less than 20 inches by 30 inches (559 mm by 762 mm) shall be provided to any attic area having a clear height of over 30 inches (762 mm). Clear headroom of not less than 30 inches (762 mm) shall be provided in the attic space at or above the access opening.

1208.3 Mechanical Appliances

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION
Access to mechanical appliances installed in under-floor areas, in attic spaces and on roofs or elevated structures shall be in accordance with the California Mechanical Code.

Section 1209 Toilet, Bathroom and Bathroom Lactation Room Requirements

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION

[P] 1209.1 Required Fixtures

AMENDMENT
This section has been amended at the state or city level.
The number and type of plumbing fixtures provided in any occupancy shall comply with the California Plumbing Code.

1209.2 Finish Materials

AMENDMENT
This section has been amended at the state or city level.
ILLUSTRATION
Walls, floors and partitions in toilet and bathrooms shall comply with Sections 1209.2.1 through 1209.2.4.

[OSHPD 1, 1R, 2, 3 & 5] Facilities subject to OSHPD 1, 1R, 2, 3 & 5 shall also comply with Section 1224.4.11.

[OSHPD 4] Facilities subject to OSHPD 4 shall also comply with Section 1227.9.
In other than dwelling units, toilet, bathing and shower room floor finish materials shall have a smooth, hard, nonabsorbent surface. The intersections of such floors with walls shall have a smooth, hard, nonabsorbent vertical base that extends upward onto the walls not less than 4 inches (102 mm).

Walls and partitions within 2 feet (610 mm) of service sinks, urinals and water closets shall have a smooth, hard, nonabsorbent surface, to a height of not less than 4 feet (1219 mm) above the floor, and except for structural elements, the materials used in such walls shall be of a type that is not adversely affected by moisture.

Exception: This section does not apply to the following buildings and spaces:

  1. Dwelling units and sleeping units.
  2. Toilet rooms that are not accessible to the public and that have not more than one water closet.

Accessories such as grab bars, towel bars, paper dispensers and soap dishes, provided on or within walls, shall be installed and sealed to protect structural elements from moisture.

Shower compartments and walls above bathtubs with installed shower heads shall be finished with a smooth, nonabsorbent surface to a height not less than 72 inches (1829 mm) above the drain inlet.
Built-in tubs with showers shall have waterproof joints between the tub and adjacent wall.
Privacy at water closets and urinals shall be provided in accordance with Sections 1209.3.1 and 1209.3.2.

Each water closet utilized by the public or employees shall occupy a separate compartment with walls or partitions and a door enclosing the fixtures to ensure privacy.

Exceptions:

  1. Water closet compartments shall not be required in a single-occupant toilet room with a lockable door.
  2. Toilet rooms located in child day care facilities and containing two or more water closets shall be permitted to have one water closet without an enclosing compartment.
  3. This provision is not applicable to toilet areas located within Group I-3 occupancy housing areas.

Each urinal utilized by the public or employees shall occupy a separate area with walls or partitions to provide privacy. The walls or partitions shall begin at a height not more than 12 inches (305 mm) from and extend not less than 60 inches (1524 mm) above the finished floor surface. The walls or partitions shall extend from the wall surface at each side of the urinal not less than 18 inches (457 mm) or to a point not less than 6 inches (152 mm) beyond the outermost front lip of the urinal measured from the finished backwall surface, whichever is greater.

Exceptions:

  1. Urinal partitions shall not be required in a single-occupant or family or assisted-use toilet room with a lockable door.
  2. Toilet rooms located in child day care facilities and containing two or more urinals shall be permitted to have one urinal without partitions.

1209.4 Baby Diaper-Changing Accommodations

AMENDMENT
This section has been amended at the state or city level.
At least one Baby Diaper-Changing Accommodation that is open and available for use by women and one that is open and available for use by men, or a single Baby Diaper-Changing Accommodation that is open and available for use by all genders, shall be installed and maintained in a newly constructed or substantially renovated Public Service Establishment at each floor level containing a toilet room available for use by the public.
Exceptions:
  1. A Baby Diaper-Changing Accommodation shall not be required if the Building Official, or his or her designee, determines that it cannot be installed and comply with City, State, or Federal laws relating to access to persons with disabilities, including Section 11B-226.4 of this Code.
  2. A Baby Diaper-Changing Accommodation shall not be required if the Building Official, or his or her designee, determines that the installation is infeasible due to spatial or structural limitations.

1209.4.1 Definitions

AMENDMENT
This section has been amended at the state or city level.
For purposes of this Section 1209.4, the following definitions shall apply.

"Baby Diaper-Changing Accommodation" shall mean a safe, sanitary, and convenient baby diaper- changing station, or similar amenity. Such accommodations may include, but are not limited to, work surfaces, stations, decks, and tables in women's and men's toilet rooms or all-gender toilet rooms.

"Public Service Establishment" shall mean a facility as specified in Subsections (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), and (13) of the definition of Place of Public Accommodation in Chapter 2 of this Code, but shall not include any such facility where entry by minors is prohibited by law.

"Substantially Renovated" shall be limited to renovation of a toilet room, and shall mean any addition, alteration, or repair project to toilet rooms, performed under a building permit with a cost of construction of $50,000 or more for renovation of one or more toilet rooms.

1209.4.2 Signage

AMENDMENT
This section has been amended at the state or city level.
Each Public Service Establishment subject to Section 1209.4 shall provide signage at or near its entrance stating "Baby Diaper-Changing Accommodation Inside." This signage shall be posted in compliance with Section 11B-216.2 of this Code. In a building encompassing multiple establishments and having a central directory, the location of all such accommodations shall be indicated on the directory.

1209.4.3

AMENDMENT
This section has been amended at the state or city level.
Nothing in this Section 1209.4 shall be construed as requiring or authorizing (1) a reduction in the number of toilet facilities that are required by Title 24 of the California Code of Regulations or (2) a reduction in the number of toilet facilities accessible to persons with disabilities that are otherwise required under either Title 24 of the California Code of Regulations or the Federal Americans with Disabilities Act.

1209.5 Lactation Rooms

AMENDMENT
This section has been amended at the state or city level.
  1. Specifications. A Lactation Room shall meet the following requirements. The room shall be at least 50 square feet. It shall include at least one electrical outlet per lactation station and an additional outlet per room for a refrigerator, a sink with hot and cold running water, and a door that can be locked from the inside. The room shall be located no more than 500 feet or within two adjacent floors from the farthest employee workspace that it is designated to serve. The room shall meet all applicable local, state, and federal accessibility requirements, including requirements under the Americans with Disabilities Act and Chapter 11B of the California Building Code.
  2. Required Construction of Lactation Rooms. A Project Sponsor shall construct Lactation Room(s) in buildings designated for Group A, B, E, F, I, M, or R-1 use as defined by Chapter 3 of the Building Code when there are tenant improvements of the building that meet the following criteria:
    1. when there is tenant improvement project for the interior of the building, and
    2. the gross square footage of the interior space designated for Employee only use (i.e., space not designated for public use) and included in the project is at least 15,000 square feet, and
    3. the estimated cost of the project stated in the building application is over $1,000,000.

      If these three requirements are met, the project shall include a Lactation Room(s), as follows:

      Employee Occupancy Load of Building Number of Lactation Rooms or Stations
      50-150 1
      151-300 2
      301-500 3
      501-1000 4
      1001-2000 8
      2001-4000 11
      For each additional 900 Employees in excess of 4000 1

      If the tenant improvement project contains existing Lactation Rooms that comply with this Section, such rooms may fulfill the requirements of this subsection (b).
  3. The requirement for a Lactation Room to have a sink, as specified by subsection (a) of this Section shall not apply where the project does not involve plumbing work.
  4. Lactation Stations. Where multiple Lactation Rooms are required for a project under subsection (b), the Project Sponsor may fulfill the requirement by merging the required rooms and the square footage specified under subsection (a) and providing one room with multiple lactation stations or multiple rooms with multiple lactation stations. The total square footage provided must meet the minimum for the number of rooms required by subsection (b). The room(s) must otherwise satisfy the requirements of this Section 1209.5, except that only one sink is required in a room with multiple lactation stations.
  5. Other Requirements of Lactation Rooms. Any Lactation Room required by this Section shall be designated for purposes of lactation and shall not be converted for any other use. Each room shall have a sign outside the door indicating that it is a Lactation Room. The sign shall comply with Section 11B-216.2 of the Building Code. The room may be temporarily used for purposes other than lactation only when the room is not being used by any employee to accommodate the employee's request for lactation accommodation under Article 33I of the Police Code. Each lactation station shall have an electrical outlet and each Lactation Room shall have one additional electrical outlet to accommodate a refrigerator for purposes of storing breastmilk.
  6. For purposes of this Section 1209.5, "Project Sponsor" means the party that constructs the tenant improvements for an end user's occupancy.

Section 1210 [HCD 1 & HCD 2] Garage Door Springs

AMENDMENT
This section has been amended at the state or city level.

1210.1 General

AMENDMENT
This section has been amended at the state or city level.
This section shall apply to applications listed in Sections 1.8.2.1.1 and 1.8.2.1.3 regulated by the Department of Housing and Community Development.

1210.1.1 Garage Door Extension Springs

AMENDMENT
This section has been amended at the state or city level.
Every garage door extension spring sold or offered for sale, whether new or as a replacement, or installed in any garage or carport which is accessory to an apartment house, hotel, motel or