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BS 5268-4.2(1990) : 1990

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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 - FIRE RESISTANCE OF TIMBER STRUCTURES - RECOMMENDATION FOR CALCULATING FIRE RESISTANCE OF TIMBER STUD WALLS AND JOISTED FLOOR CONSTRUCTIONS

Available format(s)

Hardcopy , PDF

Superseded date

30-03-2010

Language(s)

English

Published date

01-01-1990

Foreword
Committees responsible
Recommendations
1 Scope
2 Definitions
3 Fire resistance criteria
4 Materials
5 Construction details
6 Calculation method
Appendix
A Worked examples
Tables
1 Internal walls required to provide a fire resistance
    performance of 30:30:30 min. Single leaf walls of
    symmetrical/asymmetrical construction exposed to
    fire from one side at a time
2 Internal walls required to provide a fire resistance
    performance of 60:60:60 min. Single leaf walls of
    symmetrical/asymmetrical construction exposed to
    fire from one side at a time
3 Internal walls required to provide a fire resistance
    performance of 60:60:60 min. Double leaf walls of
    symmetrical/asymmetrical construction exposed to
    fire from either side
4 External walls required to provide a fire resistance
    performance of 30:30:15 min. Single leaf walls of
    symmetrical/asymmetrical construction exposed to
    fire from the inside only
5 External walls required to provide a fire resistance
    performance of 30:30:30 min. Single leaf walls of
    symmetrical/asymmetrical construction exposed to
    fire from one side
6 External walls required to provide a fire resistance
    performance of 60:60:60 min and 60:60:15 min. Single
    leaf walls of symmetrical/asymmetrical construction
    exposed to fire from one side at a time
7 Specification of materials and conditions of fixings
    for walls
8 Timber floors, concealed joists, required to provide
    fire resistance performance of 30:15:15 min and
    30:30:30 min
9 Timber floors, concealed joists, required to provide
    a fire resistance performance of 60:60:60 min
10 Timber floors, exposed joists, required to provide a
    fire resistance performance of 30:30:30 min
11 Specification of materials and conditions of fixing
    for floors
Figures
1 Diagram showing depth x breadth of stud and breadth
    of joist
2 Profiles for tongued and grooved ceiling boards
3 Methods of fixing insulation materials in walls
4 Methods of fixing insulation materials in floors
5 Method of fixing ceiling linings to exposed joists

Gives recommendations for calculating the fire resistance of timber framed walls and partitions and joisted floors as an alternative to testing. Applies to double and single leaf walls and partitions; and to floors in which the joists are partly or fully concealed. Applies to non-loadbearing wall and partition constructions where the actual stud sizes are not less than 48 mm x 37 mm (depth x breadth) and to loadbearing wall and partition constructions where actual stud sizes are not less than 62 mm x 37 mm (depth x breadth). Also applies to joisted fire floor constructions where there is a 37 mm actual joist breadth. Only covers constructions with a fire resistance requirement of 1 hour or less. Includes detailed definitions.

Committee
B/525/5
DevelopmentNote
Supersedes 86/14933 DC. (07/2005) Reviewed and confirmed by BSI, November 2007. (10/2007)
DocumentType
Standard
Pages
28
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

BS EN 1995-1-2 NA : 2004 UK NATIONAL ANNEX TO EUROCODE 5: DESIGN OF TIMBER STRUCTURES - PART 1-2: GENERAL - STRUCTURAL FIRE DESIGN
07/30147204 DC : 0 BS 476-10 - FIRE TESTS ON BUILDING MATERIALS AND STRUCTURES - PART 10: GUIDE TO THE PRINCIPLES, SELECTION, ROLE AND APPLICATION OF FIRE TESTING AND THEIR OUTPUTS
BS 5588-8:1999 Fire precautions in the design, construction and use of buildings Code of practice for means of escape for disabled people
BS 5268-2:1991 Structural use of timber Code of practice for permissible stress design, materials and workmanship
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
BS 5268-2:2002 Structural use of timber Code of practice for permissible stress design, materials and workmanship
PD 7974-3:2003 Application of fire safety engineering principles to the design of buildings Structural response and fire spread beyond the enclosure of origin (Sub-system 3)
PD 6686:2006 Guidance on directives, regulations and standards related to prevention of fire and explosion in the process industries
BS 5588-11:1997 Fire precautions in the design, construction and use of buildings Code of practice for shops, offices, industrial, storage and other similar buildings
BS 5268-6.1:1996 Structural use of timber Code of practice for timber frame walls - Dwellings not exceeding seven storeys
I.S. 444:1998 THE USE OF STRUCTURAL TIMBER IN BUILDINGS

BS 476-23:1987 Fire tests on building materials and structures Methods for determination of the contribution of components to the fire resistance of a structure
BS 1142-2:1971 Specification for fibre building boards Medium board, medium density fibreboard (MDF) and hardboard
BS 3536-1:1962 Specification for asbestos insulating boards and asbestos wallboards. Imperial units
BS 473(1971) : AMD 3695 SPECIFICATION FOR CONCRETE ROOFING TILES AND FITTINGS
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 3536-2:1974 Specification for asbestos insulating boards and asbestos wallboards Metric units
BS 4471:1987 Specification for sizes of sawn and processed softwood
BS CP112(1967) : LATEST PRESERVATIVE TREATMENTS FOR TIMBER USED IN BUILDINGS
BS 5669:1979 Specification for wood chipboard and methods of test for particle board
BS 1142-3:1972 Specification for fibre building boards Insulating board (softboard)
BS 476-20:1987 Fire tests on building materials and structures Method for determination of the fire resistance of elements of construction (general principles)
BS 476-21:1987 Fire tests on building materials and structures Methods for determination of the fire resistance of loadbearing elements of construction
BS 6214:1982 Specification for jointing materials for plasterboard
BS 1191-1:1973 Specification for gypsum building plasters Excluding premixed lightweight plasters
BS 5803-1:1985 Thermal insulation for use in pitched roof spaces in dwellings Specification for man-made mineral fibre thermal insulation mats
BS 550(1971) : AMD 3695 SPECIFICATION FOR CONCRETE ROOFING TILES AND FITTINGS
BS 1230-1:1985 Gypsum plasterboard Specification for plasterboard excluding materials submitted to secondary operations
BS 5268-6.1(1988) : 1988 STRUCTURAL USE OF TIMBER - CODE OF PRACTICE FOR TIMBER FRAME WALLS - DWELLINGS NOT EXCEEDING THREE STOREYS
BS 1369:1947 Specification for metal lathing (steel) for plastering
BS 402:1979 Specification for clay plain roofing tiles and fittings
BS 1191-2:1973 Specification for gypsum building plasters Premixed lightweight plasters
BS 476-8:1972 Fire tests on building materials and structures Test methods and criteria for the fire resistance of elements of building construction
BS 4422-2:1971 Glossary of terms associated with fire Building materials and structures
BS 476-22:1987 Fire tests on building materials and structures Method for determination of the fire resistance of non-loadbearing elements of construction

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