BS 5268-4.2(1990) : 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.