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BS 5268-3:1985

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Structural use of timber Code of practice for trussed rafter roofs
Available format(s)

Hardcopy , PDF

Superseded date

15-10-1995

Language(s)

English

Published date

29-03-1985

Foreword
Committees responsible
Code of practice
Section one. General
0 Introduction
1 Scope
2 Definitions and symbols
3 Assessment of structural adequacy
Section two. Materials
4 Timber
5 Plywood
6 Fasteners
7 Adhesives
Section three. Functional requirements
8 Environment
9 Loading
10 Deflection
11 Preservative treatment
Section four. Design of trussed rafters
12 General
13 Limitations
14 Permissible stresses, fastener loads and nail
    spacings
15 Loads
16 Method of design
Section five. Design of trussed rafter roofs
17 Design criteria
18 Compression buckling
19 Overall roof stability
20 Wall plates
Section six. Fabrication
21 General
22 Moisture content
23 Assembly
24 End joints
25 Camber
26 Marking
27 Inspection
Section seven. Handling, storage and erection
28 Handling and transportation
29 Storage
30 Erection
31 Modification and repairs
Section eight. Load testing
32 General
33 Testing authority
34 Information required by the testing authority
35 Quality and fabrication of trussed rafters for test
36 Testing equipment
37 Test conditions
38 Test procedure
39 Acceptance
40 Test report
41 Use of tested trussed rafters
Section nine. Permissible spans
42 General
43 Internal members
44 Span limitations
45 Modification to Fink configurations
Section ten. Information required
46 Designer, fabricator and client
Appendices
A Standard bracing for domestic roofs
B Erection
Tables
1 Species of timber
2 Modification factors for finger joint efficiency
    ratings
3 Minimum ventilation openings
4 Maximum bay length of rafters and ceiling ties
5 Maximum length of internal members
6 Minimum nail spacing for metal to timber joints
7 Summary of rafter loads
8 Summary of ceiling tie loads
9 Bending moment coefficients (Km)
10 Load-sharing factors for principal trussed rafters
11 Maximum deviation from vertical
12 Modification factors for test on similar trussed
    rafters
13 Maximum permissible spans for rafter members shown
    in figure 6
14 Maximum permissible spans for ceiling ties shown in
    figure 6
Figures
1 Examples of common joints
2 Supports for water tanks
3 Spacing of trussed rafters to accommodate openings
4 Chimney opening
5 Hatch opening
6 Common trussed rafter configurations
7 Location of wall plate
8 Truncated Fink trussed rafters
9 Limits of basic wind speed zones
10 Limits of standard bracing for trussed rafters
11 Standard bracing for rafter members and web members
    of duopitch trussed rafters
12 Standard bracing for rafter members and web members
    of monopitch trussed rafters
13 Method of erection for domestic roofs
14 Procedure for determining bracing design
    requirements
Index

Provides guidance on the design, fabrication and use of trussed rafters for pitched roofs. It is intended primarily for dwellings but it is also applicable to other buildings where the environment or service conditions are similar.

Committee
B/525/5
DevelopmentNote
REPLACES CP 112:PART 3:1973
DocumentType
Standard
Pages
58
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

BS 8103-3:1996 Structural design of low-rise buildings Code of practice for timber floors and roofs for housing
BS 5268-6.1(1988) : 1988 STRUCTURAL USE OF TIMBER - CODE OF PRACTICE FOR TIMBER FRAME WALLS - DWELLINGS NOT EXCEEDING THREE STOREYS
BS 5268-2:1991 Structural use of timber Code of practice for permissible stress design, materials and workmanship
BS 8000-10:1995 Workmanship on building sites Code of practice for plastering and rendering
BS 8000-8:1994 Workmanship on building sites Code of practice for plasterboard partitions and dry linings
BS 5268-2(1989) : LATEST STRUCTURAL USE OF TIMBER - CODE OF PRACTICE FOR PERMISSIBLE STRESS DESIGN, MATERIALS AND WORKMANSHIP
BS 8002:1994 Code of practice for earth retaining structures
BS 7566-2:1992 Installation of factory-made chimneys to BS 4543 for domestic appliances Specification for installation design
BS 8212:1988 Code of practice for dry lining and partitioning using gypsum plasterboard
BS 8000-5:1990 Workmanship on building sites Code of practice for carpentry, joinery and general fixings
BS 5268-7.5:1990 STRUCTURAL USE OF TIMBER - PART 7: RECOMMENDATIONS FOR THE CALCULATION BASIS FOR SPAN TABLES - SECTION 7.5: DOMESTIC RAFTERS
BS 7566-3:1992 Installation of factory-made chimneys to BS 4543 for domestic appliances Specification for site installation

BS 6100-4.1(1984) : 1984 GLOSSARY OF BUILDING AND CIVIL ENGINEERING TERMS - FOREST PRODUCTS - CHARACTERISTICS AND PROPERTIES OF TIMBER AND WOOD BASED PANEL PRODUCTS
BS 6399-3(1988) : 1988 LOADING FOR BUILDINGS - PART 3: CODE OF PRACTICE FOR IMPOSED ROOF LOADS
BS 5268-4.1:1978 STRUCTURAL USE OF TIMBER - PART 4: FIRE RESISTANCE OF TIMBER STRUCTURES - SECTION 4.1: RECOMMENDATIONS FOR CALCULATING FIRE RESISTANCE OF TIMBER MEMBERS
BS CP3:CH5-2(1972) : AMD 7908 CODE OF BASIC DATA FOR THE DESIGN OF BUILDINGS - LOADING - WIND LOADS
BS 5534-1:1978 Code of practice for slating and tiling. Design
BS 6100-4.3:1984 Glossary of building and civil engineering terms. Forest products Wood based panel products
BS 8103-1:1986 Structural design of low-rise buildings Code of practice for stability, site investigation, foundations and ground floor slabs for housing
BS 6100-4.5:1984 Glossary of building and civil engineering terms. Forest products Cork
BS 6399-1:1984 Loading for buildings Code of practice for dead and imposed loads
BS 6100-4.4(1985) : 1985 GLOSSARY OF BUILDING AND CIVIL ENGINEERING TERMS - FOREST PRODUCTS - CARPENTRY AND JOINERY
BS 6100-4.2:1984 Glossary of building and civil engineering terms. Forest products Sizes and quantities of solid timber

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