AS/NZS 1720.4:2019
Timber structures - Part 4: Fire resistance of timber elements
Objective of this standard is to provide a method for determining the fire resistance for structural adequacy and insulation of solid sawn timber, timber in pole form, plywood, laminated veneer lumber (LVL), and glued-laminated structural timber elements as an alternative to a standard fire test specified in AS 1530.4 for Australia and New Zealand; and the NZS/BS 476 series and EN 1365 series for New Zealand only. This Standard also provides methods for protecting metal connectors from the effects of fire.
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AS/NZS 1720.4:2019 Timber structures Fire resistance of timber elements
Preface
Section 1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Materials
1.4.1 Timber materials
1.4.2 Structural adhesive
1.4.3 Non-structural adhesives
1.4.4 Non-fire-retardant treated timber
Section 2 Design method
2.1 General
2.2 Structural adequacy
2.3 Integrity
2.4 Insulation
2.5 Calculation of notional charring rate
2.5.1 Notional charring rate
2.5.2 Calculation of notional charring rate
2.5.3 Notional charring rate determined by test
2.6 Calculation of effective depth of charring
2.6.1 Charring of fire-exposed surfaces
2.6.2 Charring behind fire-resistant protective insulation
2.7 Determining the effective residual section
2.8 Barrier junctions
Section 3 Assessment of joints with metal connectors
3.1 Unprotected connectors
3.2 Protected metal connectors
3.2.1 General
3.2.2 Embedding
3.2.3 Fire-resistant protective insulation covering
3.2.4 Fire resistance testing
Appendix A (normative) Determination of notional charring rate by test
Appendix B (informative) Advanced calculation methods
Bibliography
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Related Information
Similar Standards
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AS/NZS 1530.3:1999
Methods for fire tests on building materials, components and structures - Simultaneous determination of ignitability, flame propagation, heat release and smoke release
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AS/NZS 3013:2005
Electrical installations - Classification of the fire and mechanical performance of wiring system elements
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BS 476-10:2009
Fire tests on building materials and structures, Guide to the principles, selection, role and application of fire testing and their outputs
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BS 476-11:1982
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AS/NZS 1720.4:2019 Timber structures Fire resistance of timber elements
Preface
Section 1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Materials
1.4.1 Timber materials
1.4.2 Structural adhesive
1.4.3 Non-structural adhesives
1.4.4 Non-fire-retardant treated timber
Section 2 Design method
2.1 General
2.2 Structural adequacy
2.3 Integrity
2.4 Insulation
2.5 Calculation of notional charring rate
2.5.1 Notional charring rate
2.5.2 Calculation of notional charring rate
2.5.3 Notional charring rate determined by test
2.6 Calculation of effective depth of charring
2.6.1 Charring of fire-exposed surfaces
2.6.2 Charring behind fire-resistant protective insulation
2.7 Determining the effective residual section
2.8 Barrier junctions
Section 3 Assessment of joints with metal connectors
3.1 Unprotected connectors
3.2 Protected metal connectors
3.2.1 General
3.2.2 Embedding
3.2.3 Fire-resistant protective insulation covering
3.2.4 Fire resistance testing
Appendix A (normative) Determination of notional charring rate by test
Appendix B (informative) Advanced calculation methods
Bibliography
AS/NZS 1720.4:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.