AS 4440-1997

1 - AS 4440-1997 INSTALLATION OF NAILPLATED TIMBER TRUSSES
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 APPLICATION
7 - 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
8 - 1.5.5 Eaves
8 - 1.5.6 Gable-end truss
8 - 1.5.7 Galvanized steel
8 - 1.5.8 Girder truss
8 - 1.5.9 Nailplates
8 - 1.5.10 Overhang
8 - 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 Span
9 - 1.5.18 Station
9 - 1.5.19 Steel-brace
9 - 1.5.20 Structural fascia
9 - 1.5.21 Timber truss
9 - 1.5.22 Truss engineer
9 - 1.5.23 Valley (saddle) trusses
9 - 1.5.24 Verge overhang
9 - 1.5.25 Waling plate
13 - 1.6 LOADS
13 - 1.7 DOCUMENTATION AT APPROVAL STAGE AND DELIVERY
14 - SECTION 2 SUPPORTING STRUCTURES
14 - 2.1 GENERAL
14 - 2.2 WALLS
14 - 2.2.1 Load-bearing walls
14 - 2.2.2 Non-load-bearing walls
15 - 2.2.3 Fixing to top plates of non-load-bearing walls
17 - SECTION 3 TRUSS INSTALLATION
17 - 3.1 TRUSS LAYOUT
17 - 3.2 TEMPORARY BRACING
18 - 3.3 INSTALLATION TOLERANCES
18 - 3.3.1 General
18 - 3.3.2 Bow
18 - 3.3.3 Plumb
18 - 3.3.4 Spacing
19 - 3.4 PLASTERBOARD FIXED DIRECTLY TO BOTTOM CHORDS
19 - 3.5 TIE-DOWN REQUIREMENTS
19 - 3.6 MULTIPLE (MULTI-PLY) TRUSS
19 - 3.7 TRUSS MODIFICATION
19 - 3.8 REJECTION CRITERIA
19 - 3.9 TRANSPORT, STORAGE, LIFTING AND HANDLING
20 - SECTION 4 ROOF BRACING
20 - 4.1 GENERAL
20 - 4.2 ROOF BATTENS
20 - 4.2.1 General
20 - 4.2.2 Intermediate battens for valley intersection
21 - 4.3 TOP CHORD BRACING
21 - 4.3.1 General
21 - 4.3.2 Steel-brace
22 - 4.3.3 Steel-brace for gable roof
27 - 4.3.4 Steel-brace for hip roof
30 - 4.3.5 Steel-brace for dual-pitched roof
30 - 4.3.6 Steel-brace for bell roof
31 - 4.3.7 Steel-brace for mono-pitched roof
31 - 4.3.8 Fixing
34 - 4.4 BOTTOM CHORD BRACING
34 - 4.4.1 General
34 - 4.4.2 Ceiling battens
35 - 4.4.3 Bottom chord ties
35 - 4.5 WEB BRACING
37 - SECTION 5 TRUSS CONNECTION
37 - 5.1 GENERAL
37 - 5.2 HIP ENDS
37 - 5.2.1 Hip-end connection for low wind (design wind speed up to 41 m/s, non-cyclonic area)
40 - 5.2.2 Hip-end connection for high wind (design wind speed from 41 m/s to 60 m/s, cyclonic area)
43 - 5.3 GIRDER TRUSSES
43 - 5.3.1 Girder brackets (truss boots)
44 - 5.3.2 Waling plates for Dutch-hip girder
45 - 5.4 VALLEY (SADDLE) TRUSSES
45 - 5.4.1 Valley truss connection for low wind (design wind speed up to 41 m/s, non-cyclonic area)
46 - 5.4.2 Valley truss connection for high wind (design wind speed from 41 m/s to 60 m/s, cyclonic area)
47 - SECTION 6 OVERHANGS
47 - 6.1 STANDARD OVERHANGS
47 - 6.1.1 General
47 - 6.1.2 Raking eaves in hip corner
47 - 6.1.3 Boxed eaves
48 - 6.2 GABLE VERGE
48 - 6.2.1 Gable-end truss
49 - 6.2.2 Verge overhang
51 - 6.3 BOXED GABLE ENDS
51 - 6.4 VERANDAHS
51 - 6.5 PERGOLAS
52 - APPENDIX A - DOCUMENTATION AT APPROVAL STAGE AND ON DELIVERY
52 - A1 INTRODUCTION
52 - A2 APPROVAL STAGE
52 - A3 DELIVERY
52 - A4 CHECK LIST
54 - APPENDIX B - RECOMMENDED PRACTICE FOR TRUSS INSTALLATION
54 - B1 INTRODUCTION
54 - B2 CAMBERS
54 - B3 FIX OF CORNICE
54 - B4 BEARING WIDTH
55 - APPENDIX C - RECOMMENDATIONS FOR TEMPORARY BRACING
55 - C1 GENERAL
55 - C2 HIP OR DUTCH-HIP END ROOF
56 - C3 GABLE-END ROOF
57 - APPENDIX D - TRANSPORT, STORAGE, LIFTING AND HANDLING OF TRUSSES
57 - D1 SCOPE AND GENERAL
57 - D2 TRANSPORT
57 - D3 STORAGE
57 - D4 LIFTING AND HANDLING
59 - APPENDIX E - TYPICAL SPECIFICATION FOR, AND EXAMPLE OF, A STEEL-BRACE
60 - APPENDIX F - PERMANENT BOTTOM CHORD TIES
63 - APPENDIX G - FIXING DETAILS FOR TYPICAL GIRDER BRACKETS (TRUSS BOOTS)

Specifies basic requirements for the bracing, connection and installation of nailplated timber trusses. Requirements are given for supporting structures, truss installation, roof bracing, truss connection and overhangs. Appendices provide guidance on temporary bracing; transport, storage, lifting and handling of trusses; typical specification for and example of steel-brace; fixing details for typical girder brackets (truss boots); recommended sizes and spacings for permanent bottom chord ties; and recommended practice for truss installation.

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

First published as AS 4440-1997.