Standard
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AS/NZS 2785:2020
[Current]Suspended ceilings — Design and installation
This Standard sets out the minimum requirements for the design, construction, installation, maintenance, and testing of internal and external non-trafficable suspended ceiling systems of dry construction with suspension systems attached to a supporting structure. It is intended for use in commercial and industrial applications. This Standard also applies to domestic structures designed in accordance with AS 1170.4 in Australia.
Published: 29/05/2020
Pages: 85
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Notation
2 Design requirements
2.1 Design
2.1.1 Aim
2.1.2 Requirements
2.1.3 General design considerations
2.1.4 Ductility
2.2 Actions
2.2.1 General
2.2.2 Requirements
2.2.3 Other actions
2.3 Ultimate limit state
2.3.1 General
2.3.2 Design criteria
2.3.3 Combinations of actions for ultimate limit state
2.3.4 Fasteners and hangers
2.3.5 Wind actions and internal pressures
2.3.6 Earthquake
2.3.6.1 General
2.3.6.2 Requirements
2.3.6.3 Ultimate inter-storey drift deflections
2.4 Serviceability limit state
2.4.1 General
2.4.2 Method
2.4.3 Combinations of actions for serviceability limit state
2.4.4 Serviceability inter-storey drift deflections
2.4.5 Deflection limits
2.5 Fire reaction and resistance
2.5.1 General
2.5.2 Method
2.5.2.1 Reaction to fire (early fire hazard properties)
2.5.2.2 Resistance to fire
2.6 Acoustic requirements
2.6.1 General
2.6.2 Method
2.6.2.1 Sound absorption
2.6.2.2 Sound transmission
2.6.2.2.1 Ceiling attenuation
2.6.2.2.2 Airborne sound insulation
2.6.2.3 Impact sound insulation
2.6.3 Laboratory versus field measurements
2.7 Ceiling movement considerations
2.7.1 General
2.7.2 Thermal
2.7.3 Hygroscopic
2.8 Durability (for New Zealand only)
3 Construction, installation and maintenance
3.1 Pre-construction
3.2 Site conditions and installation
3.2.1 Site conditions
3.2.2 Installation
3.3 Setting out
3.4 Ceiling systems
3.5 Top fasteners
3.5.1 General
3.5.2 Fixing into concrete
3.5.3 Fixing into steel
3.6 Hangers, struts and ties
3.7 Partitions
3.8 Bulkheads and upstands
3.9 Tiles and infill panels
3.10 Luminaires
3.11 Finish
3.12 Joints
3.12.1 General
3.12.2 Control joints
3.12.3 Building movement joints
3.13 Protection of installed ceiling
3.14 Inspection of installed ceiling
3.15 Maintenance
4 Detailing, ceiling restraint and services interaction
4.1 Ceiling layout
4.2 Services and other attachments
4.2.1 General
4.2.2 Services including air conditioning and ventilation
4.2.3 Electrical services
4.2.4 Sprinklers
4.2.5 Other
4.3 Seismic restraint of the ceiling
4.3.1 General
4.3.2 Joint types
4.3.2.1 Fixed end perimeter joints
4.3.2.2 Floating/free perimeter joints
4.3.2.3 Seismic joints
4.3.3 Seismic restraint types
4.3.3.1 General
4.3.3.2 Perimeter restrained ceilings
4.3.3.3 Perimeter fixed with seismic separation joints ceilings
4.3.3.4 Floating/free ceiling with back bracing
4.3.3.4.1 Back bracing in two directions
4.3.3.4.2 Back bracing in one direction
4.3.3.4.3 Back bracing
4.3.3.5 Floating ceilings (Australia only)
4.4 Ceiling and services interaction
5 Materials
5.1 General
5.2 Aluminium
5.3 Copper
5.4 Zinc-coated and aluminium/zinc-coated steel
5.5 Steel sections
5.6 Stainless steel
5.7 Timber
5.8 Protective coatings
5.9 Paints
5.9.1 Paint for metal protection
5.9.2 Paint for protection and decoration
5.9.3 Pre-painted post-formed metal sections
5.9.4 Finishes
5.10 Powder coated sections
5.10.1 Aluminium substrate
5.10.2 Metal substrate other than aluminium
5.11 Colour and texture
5.11.1 General
5.11.2 Colour texture and gloss
5.12 Adhesion and resilience
6 Testing
6.1 Testing methods
6.1.1 General
6.1.2 Sub-assemblies
6.1.3 Grid ceiling systems
6.1.3.1 General
6.1.3.2 Diaphragm action
6.1.4 Other ceiling grid systems
6.2 Testing
6.2.1 Testing for material properties
6.2.2 Testing for determining section or member properties
6.2.2.1 Testing for determining section properties
6.2.2.2 Static tests for flexural strength
6.2.2.3 Static tests for serviceability
6.2.2.4 Testing for axial capacity
6.2.3 Testing of connections
6.2.3.1 Static tests for connections
6.2.3.2 Testing of single point fasteners
6.2.4 Dynamic testing
6.3 Testing protocol
6.3.1 Test specimen
6.3.2 Number of tests
6.3.3 Pre-loading test samples
6.3.4 Criteria for acceptance
6.3.5 Determination of design capacities
6.3.6 Reporting of results
6.4 Fire reaction and resistance
6.4.1 Testing for early fire hazard properties
6.4.2 Testing for resistance to fire
6.4.3 Testing for flammability (Australia only)
6.4.4 Test method reporting
6.5 Acoustic testing
6.5.1 Sound absorption
6.5.2 Airborne sound insulation
6.5.3 Impact sound insulation
6.5.4 Test method reporting
6.6 Alternative test methods
Appendix A
Appendix B
B.1 Basic design criteria
B.2 Seismic design and performance criteria
B.2.1 General
B.2.2 For Australia
B.2.3 For New Zealand
B.3 Wind design and performance criteria
B.4 Design drawings and documentation for tender
B.5 Interaction of ceiling system and building services
B.6 Construction drawings and documentation
B.7 Ultimate limit state seismic drift deflections for ceilings
B.8 Seismic actions on walls restraining the ceilings
B.9 Seismic actions on back bracing or plenum braces
B.10 Colour and texture
B.10.1 Limitation
B.10.2 Purchasing
B.10.3 Non-standard colour or texture
B.11 Documentation requirements for New Zealand
B.11.1 General
B.11.2 Producer’s statement (PS)
B.11.3 Construction Monitoring (CM)
B.12 Considerations for design
B.12.1 General
B.12.2 Specific Engineering Design (SED)
B.12.2.1 General
B.12.2.2 Application of Specific Engineering Design (SED)
B.12.3 Seismic considerations — For Australia
B.12.4 Seismic considerations — For New Zealand
B.12.5 Wind considerations
Appendix C
C.1 Construction program and site details
C.2 Site conditions and time of installation
C.3 Construction drawings
C.4 Inspection
C.4.1 General
C.4.2 Support hangers
C.4.3 Back bracing or plenum bracing of ceilings
C.4.4 Fastening of support hangers
C.4.5 Ceiling perimeter fastening
C.4.6 Access hatches
C.4.7 Joints
C.5 Certificates and reports
Appendix D
Appendix E
Appendix F
F.1 Function
F.2 Performance
F.3 Normal maintenance
F.4 General
F.5 Application
F.6 Corrosion protection
F.7 Stress corrosion
F.8 Crevice corrosion
F.9 Aggressive atmospheres
F.10 Condensation
F.11 Sacrificial coatings
Appendix G
G.1 Fasteners
G.2 Top fasteners
G.2.1 Purlin fasteners
G.2.2 Concrete fasteners
G.2.3 Aerated/lightweight concrete fasteners
G.2.4 Structural steel
G.2.5 Timber
G.2.6 Metal deck roofing
G.2.7 Screw fasteners
G.2.8 Fasteners over swimming pools
G.2.9 Example calculation
G.3 Corrosion protection
Appendix H
Appendix I
I.1 Sheeted or flush ceiling grids
I.1.1 General
I.1.2 Plasterboard
I.1.3 Primary, cross rail or strongback
I.1.4 Furring channel/tee grid
I.1.5 Connection furring channel to primary, cross rail or strongback
I.2 Exposed grids (including exposed one-way and two-way)
I.2.1 General
I.2.2 Primary rail, cross rail or strongback
I.2.3 Main runners
I.2.4 Cross-runners
I.3 Concealed grids
I.4 Metal linear ceilings
I.5 Cell ceilings
I.6 Metal plank ceilings
I.7 Baffles and grids
Appendix J
J.1 Tiles and infill panels
J.2 Metal tiles
J.3 Hold-down clips
Appendix K
Bibliography
Cited references in this standard
[Withdrawn]
Acoustics — Measurement of sound insulation in buildings and of building elements, Part 7: Field measurements of impact sound insulation of floors (ISO 140-7:1998, MOD)
[Pending Revision]
Acoustics — Rating of sound insulation in buildings and of building elements, Part 2: Impact sound insulation
[Current]
Structural design actions, Part 1: Permanent, imposed and other actions
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