BS 5268-3:2006 2007
$191.13
Structural use of timber – Code of practice for trussed rafter roofs
| Published By | Publication Date | Number of Pages |
| BSI | 2007 | 74 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 7 | Introduction 1 Scope 2 Normative references |
| 8 | 3 Terms, definitions and symbols service class 1 service class 2 trussed rafter principal trussed rafter girder truss attic truss wind girder chord member |
| 9 | rafter member node bay fastener bite common production end metal plate fastener width 4 Assessment of structural adequacy 5 Materials 5.1 Timber |
| 10 | Species of timber |
| 11 | Modification factors for finger joint efficiency ratings 5.2 Plywood 5.3 Fasteners |
| 12 | 5.4 Adhesives 5.5 Preservative treatment 6 Trussed rafter design 6.1 General |
| 13 | 6.2 Limitations Maximum bay length of chord members |
| 14 | Maximum length of internal members 6.3 Permissible stresses, fastener loads and nail spacing Minimum nail spacing for metal to timber jointsa |
| 15 | 6.4 Loads Summary of rafter loads |
| 16 | Summary of ceiling tie loads |
| 17 | Example load combinations |
| 18 | 6.5 Method of design |
| 20 | Examples of joints |
| 21 | Examples of joints |
| 22 | Wall plate location for simplified analysis |
| 23 | Bending moment coefficients (Km) |
| 25 | Load-sharing factors for principal trussed rafters |
| 26 | (deleted) |
| 27 | Tension stress condition perpendicular to grain at joints Force modification factor (Ke) for joints in eccentrically loaded components subject to tension perpendicular to grain |
| 29 | 7 Roof design 7.1 Design responsibilities 7.2 Overall stability |
| 32 | 7.3 Wall plates 7.4 Plasterboard ceilings 7.5 Water tanks |
| 33 | Supports for water tanks |
| 34 | 7.6 Hatch, chimney and other openings 7.7 Roof environment |
| 35 | Spacing of trussed rafters to accommodate openings |
| 36 | Chimney opening |
| 37 | Hatch opening |
| 38 | 8 Fabrication 8.1 General 8.2 Assembly |
| 39 | 8.3 Marking |
| 40 | 9 Handling, storage and erection 9.1 Handling and transportation 9.2 Storage 9.3 Erection |
| 41 | 9.4 Modification and repairs |
| 42 | 10 Load testing 10.1 General 10.2 Testing authority 10.3 Information required by the testing authority 10.4 Quality and fabrication of trussed rafters for test 10.5 Tests on similar configurations 10.6 Acceptance |
| 43 | Modification factor (Kt) for strength tests on trussed rafters 10.7 Use of tested trussed rafters |
| 44 | 11 Exchange of information 11.1 Information required by the trussed rafter designer from the building designer 11.2 Information to be provided by the trussed rafter designer to the building designer |
| 46 | (normative) Roof bracing (normative) Roof bracing General Sarking materials Thickness and fixing of sarking materials |
| 47 | Non-standard roof bracing |
| 48 | Procedure for the design of roof bracing at rafter level |
| 49 | Procedure for the design of roof bracing at ceiling level |
| 51 | Standard bracing for rafter and web members of duopitch trussed rafters |
| 53 | Standard bracing for rafter and web members of monopitch trussed rafters |
| 54 | Limiting spans for standard bracing of trussed rafter roofs |
| 55 | Basic wind zones |
| 56 | Maximum allowable cumulative surface wind pressures (kN/m2) on windward and leeward gable walls for roofs constructed using the details of Figure A.8 Maximum allowable cumulative surface wind pressures (kN/m2) on windward and leeward gable walls for roofs constructed using the details of Figure A.9 and Figure A.10 |
| 57 | Permissible horizontal wind force (kN/m) at bottom chord level on 12.5 mm thick plasterboard ceiling diaphragms Permissible horizontal wind force (kN/m) at bottom chord level on 15 mm thick plasterboard ceiling diaphragms |
| 58 | Standard bracing for rafter members: detail C1 and D1 |
| 59 | Standard bracing for rafter members: detail C1 and D1 (continued) |
| 61 | Standard bracing for rafter members: detail C2 and D2 (continued) |
| 62 | Standard bracing for rafter members: detail C3 |
| 63 | Standard bracing for rafter members: detail C3 |
| 64 | Standard bracing for rafter members: detail D3 splice connection and D4 crossing connection |
| 65 | Standard bracing for rafter members: detail D3 splice connection and D4 crossing connection (continued) |
| 66 | (normative) Permissible spans (normative) Permissible spans General Internal members |
| 67 | Span limitations Modification to Fink configurations |
| 68 | Truncated Fink trussed rafters |
| 69 | Maximum permissible spansa for rafter members shown in Figure 11 |
| 70 | Maximum permissible spansa for rafter members shown in Figure 11 Maximum permissible spansa for ceiling ties shown in Figure 11 |
| 71 | Maximum permissible spansa for ceiling ties shown in Figure 11 |
