AS 4440-2004

1 - AS 4440-2004 INSTALLATION OF NAILPLATED TIMBER ROOF TRUSSES -
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 APPLICATION
8 - 1.3 REFERENCED DOCUMENTS
8 - 1.4 USE OF ALTERNATIVE MATERIALS OR METHODS
8 - 1.5 DEFINITIONS
8 - 1.5.1 Approved
8 - 1.5.2 Approved specification
8 - 1.5.3 Boxed eaves
8 - 1.5.4 Camber
9 - 1.5.5 Eaves
9 - 1.5.6 Gable-end truss
9 - 1.5.7 Galvanized steel
9 - 1.5.8 Girder truss
9 - 1.5.9 Nailplates
9 - 1.5.10 Truss overhang
9 - 1.5.11 Pitching point
9 - 1.5.12 Raking eaves
9 - 1.5.13 Raking truss
9 - 1.5.14 Regulatory authority
9 - 1.5.15 Reinforced-head nails
9 - 1.5.16 Spacing
9 - 1.5.17 Truss span
9 - 1.5.18 Station
10 - 1.5.19 Steelbrace
10 - 1.5.20 Structural fascia
10 - 1.5.21 Timber truss
10 - 1.5.22 Truss engineer
10 - 1.5.23 Valley (saddle) truss
10 - 1.5.24 Verge overhang
10 - 1.5.25 Waling plate
13 - 1.6 LOADS
13 - 1.7 DOCUMENTATION AT APPROVAL STAGE AND DELIVERY
13 - 1.8 NAILS
14 - SECTION 2 SUPPORTING STRUCTURES
14 - 2.1 GENERAL
14 - 2.2 WALLS
14 - 2.2.1 Loadbearing walls
14 - 2.2.2 Non-loadbearing walls
15 - 2.2.3 Fixing to top plates of non-loadbearing walls
17 - SECTION 3 TRUSS INSTALLATION
17 - 3.1 TRUSS LAYOUT
17 - 3.2 STABILITY DURING INSTALLATION
17 - 3.3 TEMPORARY BRACING
18 - 3.4 INSTALLATION TOLERANCES
18 - 3.4.1 General
18 - 3.4.2 Bow
18 - 3.4.3 Plumb
19 - 3.4.4 Spacing
19 - 3.5 PLASTERBOARD FIXED DIRECTLY TO BOTTOM CHORDS
19 - 3.6 INTERMEDIATE CEILING JOISTS
19 - 3.7 TIE-DOWN REQUIREMENTS
19 - 3.8 MULTIPLE (MULTI-PLY) TRUSS
19 - 3.9 TRUSS MODIFICATION
20 - 3.10 REJECTION CRITERIA
20 - 3.11 TRANSPORT, STORAGE, LIFTING AND HANDLING
21 - SECTION 4 ROOF BRACING
21 - 4.1 GENERAL
21 - 4.2 ROOF BATTENS
21 - 4.2.1 General
22 - 4.2.2 Intermediate and internal top chord ties
24 - 4.3 TOP CHORD BRACING
24 - 4.3.1 General
24 - 4.3.2 Steelbrace
24 - 4.3.3 Steelbrace for gable roof
31 - 4.3.4 Steelbrace for hip roof
33 - 4.3.5 Steelbrace for dual-pitched roof
34 - 4.3.6 Steelbrace for bell roof
34 - 4.3.7 Steelbrace for mono-pitched roof
35 - 4.3.8 Fixing
39 - 4.4 BOTTOM CHORD BRACING
39 - 4.4.1 General
39 - 4.4.2 Bottom chord lateral restraints
40 - 4.5 WEB BRACING
41 - SECTION 5 TRUSS CONNECTION
41 - 5.1 GENERAL
41 - 5.2 HIP ENDS
41 - 5.2.1 Hip-end connection for low wind area (wind classification N1, N2, N3, OR C1)
44 - 5.2.2 Hip-end connection for high wind area (wind classification N4, C2 or C3)
47 - 5.3 GIRDER TRUSSES
47 - 5.3.1 Girder brackets (truss boots)
48 - 5.3.2 Waling plates for Dutch-hip girder
49 - 5.4 VALLEY (SADDLE) TRUSSES
49 - 5.4.1 Valley truss connection for wind classification N1, N2, N3 or C1
50 - 5.4.2 Valley truss connection for wind classification N4, C2, OR C3
51 - SECTION 6 TRUSS OVERHANGS
51 - 6.1 STANDARD TRUSS-OVERHANGS
51 - 6.1.1 General
51 - 6.1.2 Raking eaves in hip corner
51 - 6.1.3 Boxed eaves
52 - 6.2 GABLE VERGE
52 - 6.2.1 Gable-end truss
53 - 6.2.2 Verge overhang
55 - 6.3 BOXED GABLE ENDS
55 - 6.4 VERANDAHS
55 - 6.5 PERGOLAS
56 - APPENDIX A - DOCUMENTATION AT APPROVAL STAGE AND ON DELIVERY
56 - A1 INTRODUCTION
56 - A2 APPROVAL STAGE
56 - A3 DELIVERY
56 - A4 CHECK LIST
58 - APPENDIX B - RECOMMENDED PRACTICE FOR TRUSS INSTALLATION
58 - B1 INTRODUCTION
58 - B2 CAMBERS
58 - B3 FIXING OF CORNICE
58 - B4 BEARING WIDTH
59 - APPENDIX C - RECOMMENDATIONS FOR TEMPORARY BRACING
59 - C1 GENERAL
60 - C2 HIP OR DUTCH-HIP END ROOF
60 - C3 GABLE-END ROOF
62 - APPENDIX D - INTERMEDIATE CEILING JOISTS AND HANGERS
62 - D1 GENERAL
62 - D2 SIZE
62 - D3 CONNECTION
63 - APPENDIX E - TRANSPORT, STORAGE, LIFTING AND HANDLING OF TRUSSES
63 - E1 GENERAL
63 - E2 TRANSPORT
63 - E3 STORAGE
63 - E4 LIFTING AND HANDLING
65 - APPENDIX F - TYPICAL SPECIFICATION FOR, AND EXAMPLE OF, A STEELBRACE
66 - APPENDIX G - FIXING DETAILS FOR TYPICAL GIRDER BRACKETS (TRUSS BOOTS)

Specifies basic requirements for the bracing, connection and installation of nailplated timber roof trusses. Requirements are given for supporting structures, roof truss installation, roof bracing, truss connection and overhangs. This edition incorporates provision for limit state design methods, requirement for fixing to non-loadbearing external walls, and provisions for intermediate ceiling joists and internal top chord ties for north-light (sky-light) trusses. Appendices provide guidance on temporary bracing, transport, storage, lifting and handling of roof trusses; typical specification for and example of steelbrace; fixing details for typical girder brackets (truss boots); and recommended practice for roof truss installation.

This Standard specifies requirements for the bracing, connection and installation of nailplated timber trusses in roof structures for typical application.

Originated as AS 4440-1997.
Second edition 2004.