Copyright

Preface

Dedications

Acknowledgements

Chapter 1 Administration

Chapter 2 Definitions

Chapter 3 Use and Occupancy Classification

Chapter 4 Special Detailed Requirements Based on Use and Occupancy

Chapter 5 General Building Heights and Areas; Separation of Occupancies

Chapter 6 Types of Construction

Chapter 7 Fire and Smoke Protection Features

Chapter 8 Interior Finishes

Chapter 9 Fire Protection Systems

Chapter 10 Means of Egress

Chapter 11 Accessibility

Chapter 12 Interior Environment

Chapter 13 Energy Efficiency

Chapter 14 Exterior Walls

Chapter 15 Roof Assemblies and Rooftop Structures

Chapter 16 Structural Design

Chapter 17 Structural Tests and Special Inspections

Chapter 18 Soils and Foundations

Chapter 19 Concrete

Chapter 20 Aluminum

Chapter 21 Masonry

Chapter 22 Steel

Chapter 23 Wood

Chapter 24 Glass and Glazing

Chapter 25 Gypsum Board and Plaster

Chapter 26 Plastic

Chapter 27 Electrical

Chapter 28 Mechanical Systems

Chapter 29 Plumbing Systems

Chapter 30 Elevators and Conveying Systems

Chapter 31 Special Construction

Chapter 32 Encroachments Into the Public Right-Of-Way

Chapter 33 Safeguards During Construction or Demolition

Chapter 34 Reserved

Chapter 35 Referenced Standards

Appendix A Reserved

Appendix B Reserved

Appendix C Reserved

Appendix D Fire Districts

Appendix E Supplementary Accessibility Requirements

Appendix F Rodentproofing

Appendix G Flood-Resistant Construction

Appendix H Outdoor Signs

Appendix I Reserved

Appendix J Reserved

Appendix K Modified Industry Standards for Elevators and Conveying Systems

Appendix L Reserved

Appendix M Supplementary Requirements for One- And Two-Family Dwellings

Appendix N Assistive Listening Systems Performance Standards

Appendix O Reserved

Appendix P Type B+NYC Unit Toilet and Bathing Rooms Requirements

Appendix Q Modified National Standards for Automatic Sprinkler, Standpipe, Fire Pump and Fire Alarm Systems

Appendix R Acoustical Tile and Lay-In Panelceiling Suspension Systems

Appendix S Supplementary Figures for Luminous Egress Path Markings

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Where required by Section 808 of this code, the provisions of ASTM C 635 and ASTM C 636, as modified by this appendix, shall govern the design and installation of ceiling suspension systems used to support acoustical tiles, or acoustical lay-in panels weighing less than 4 pounds per square foot (191.5 Pa), not contributing to the fire-resistance rating of a floor or roof assembly and not used for meeting the noise control requirements of the building code. Refer to the rules of the department for any subsequent additions, modifications or deletions that may have been made to this standard in accordance with Section 28-103.19 of the Administrative Code.
Modify section 3.1 as follows:

3.1.1.4 carrying channel ‒ The term "carrying channel" shall mean the three sided or "[" shaped-metal sections that support the entire structural grid network (Figure 1A, 1B, and 1C). The carrying channels are suspended by hangers from the existing structure and main runners are then attached to the channels.

3.1.1.6 cross runner ‒ The term "cross runner" shall mean the secondary or cross beams of a mechanical ceiling suspension (Figure 1A). The cross runners normally support only the acoustical tile. In some forms of suspension systems, the cross runners also provide support for other cross runners.

3.1.1.7 hanger ‒ The term "hanger" shall mean the member employed to suspend the acoustical ceiling from the existing structure (wood joists, steel bar joists, steel beams, concrete slabs, etc.) (Figure 1A, 1B, and 1C).

3.1.1.10 main runner ‒ The term "main runner" shall mean the primary or main beams of the type of ceiling suspension system in Figure 1A and Figure 1B. The main runners provide direct support for cross runners, and they may support lighting fixtures and air diffusers. In addition, the acoustical tile may also be directly supported by the main runners. The main runners are installed perpendicular to the carrying channels and are supported by specially designed sheet metal or wire clips attached to the carrying channels (Figure 1A, 1B).
Add section 4.5 as follows:

4.5 Splines shall not be considered as providing nor shall be used for providing structural support for the ceiling material.
Delete Section 2.1.3 and replace as follows:

2.1.3 Hangers shall be spaced a maximum of 4 ft 6 in (1372 mm) on center. Each hanger shall be capable of supporting the suspended load in accordance with the provisions of this code. If local situations require greater center distances between hangers, the load-carrying capacity of the ceiling suspension system shall be reduced commensurate with the actual center-to-center hanger distances used.
Delete Section 2.1.4 and replace as follows:

2.1.4 Hangers shall be designed to support the suspended loads and shall be a minimum 1/4 inch (6.4mm) diameter galvanized steel rods or 1 inch×1/8inch thick (25 mm ×3.2 mm) flat steel bars. The use of steel wire as a hanger shall not be permitted.
Delete Section 2.1.5 and replace as follows:

2.1.5 Each connection of a hanger to a structural member of the building shall be in accordance with Section 2.1.5.1 or 2.1.5.2 as applicable.

2.1.5.1 Construction Types I and II. In buildings of Types I and II construction, hangers shall be attached to the structure of the building in accordance with the applicable structural systems indicated in Figures 1A and 1B.

2.1.5.2 Construction types III, IV, and V. Every other hanger supported from wood structural members of the building shall be attached by two 1/4 inch (6.4 mm) diameter through bolts or clinched nails. However, every other hanger shall be permitted to be attached by two 1/4 inch (6.4 mm) diameter barbed anchor nails 21/4 inches (57 mm) long with oval heads. All bolts and nails shall be inserted at least 2 inches (51 mm) above the bottom of the wood members.
Delete Section 2.1.6 and replace as follows:

2.1.6 Existing hangers shall not be used unless they comply, or are made to comply, with all of the provisions of this code relating to hangers.
Delete Section 2.1.7 and replace as follows:

2.1.7 Carrying channels shall be attached to hangers in a manner that will prevent any vertical movement or rotation. If hangers are secured to special attachment devices that support the carrying channels, such devices shall have certified load test data from an approved testing agency and shall be capable of carrying four times the design load.
Delete Section 2.2.3 and replace as follows:

2.2.3 Local kinks or bends shall not be made in hangers as a means of leveling the carrying channels.
Delete Section 2.2.4 and replace as follows:

2.2.4 Carrying channels shall be designed to support the suspended loads, and shall be a minimum 11/2 inches deep (38 mm) cold-rolled steel channel weighing 0.457 pounds per linear foot (0.707 kg/m) and shall be given an electro-galvanized, hot dipped galvanized cadmium coating, or zinc coating.
Delete Section 2.3.1 and replace as follows:

2.3.1 Main runners shall be installed such that they are level within 1/8 inch vertical in 12 feet horizontal (1-percent slope) when the main runner is in firm contact with the carrying channel.
Delete Section 2.3.2 and replace as follows:

2.3.2 Main runners shall be supported from the carrying channels. Direct hung suspension systems where the main runners are supported directly to the existing structure shall not be permitted indirect hung or furring bar suspension systems designed and installed in accordance with this code and utilizing carrying channels shall be permitted.
Delete Section 2.3.3 and replace as follows:

2.3.3 Main runners shall be attached to the carrying channels in a manner that will prevent any vertical movement or rotation.
2.3.4 If the main runners are supported from the carrying channels by special devices, such devices shall be capable of carrying four times the design load. The devices shall be load tested by an approved testing agency that shall certify the devices are in compliance with this code. Such certifications shall be made available to the department and the applicant of record upon request.
Modify Section 2.7.2 to read as follows:

2.7.2 Fixtures shall not be supported from main runners if the weight of the fixture causes the total dead load to exceed the deflection capability of the ceiling suspension system. Fixtures exceeding 80 lbs (36 kg) in weight shall be supported independent of the ceiling suspension system. Fixtures weighing 80 lbs (36 kg) or less may be supported from the carrying channels. Fixtures weighing 50 lbs (23 kg) or less may be supported from the main runners. Cross runners shall not be used to support fixtures.
Add Section 2.7.5 to read as follows:

2.7.5 The construction documents shall show the necessary details of the acoustical ceiling to identify the number, size, spacing, location, weights, and types of fixtures and means employed to comply with these requirements.



FIGURE 1A INDIRECT HUNG SUSPENSION SYSTEM



FIGURE 1A HANGER CONNECTION DETAILS FOR CONSTRUCTION GROUPS I AND II



FIGURE 1B INDIRECT HUNG SUSPENSION SYSTEM



FIGURE 1B HANGER CONNECTION DETAILS FOR CONSTRUCTION GROUPS I AND II



FIGURE 1C FURRING BAR SUSPENSION SYSTEM
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