BS 4046:1991

Committees responsible
Foreword
Specification
1 Scope
2 Definitions
3 Classification
4 Test for performance and physical characteristics
5 Dimensional tolerances
6 Taper profile
7 Squareness
8 Mass
9 Moisture content
10 Modulus of elasticity
11 Bending strength
12 Resistance to impact
13 Screw holding
14 Thermal conductivity
15 Boron content
16 Dimensional changes associated with changes in
    relative humidities
17 Marking
Appendices
A Methods of test
B Guidance on the use of compressed straw building
    slabs
Tables
1 Summary of tests for performance and physical
    characteristics
2 Test levels for dimensional tolerances
3 Test levels for slab mass
4 Test levels for modulus of elasticity and bending
    strength
Figures
1 Typical arrangement of longitudinal voids
2 Profile of taper edged slabs
3 Positions for measurement of slab thickness and
    taper depth
4 Measurement of squareness of boards
5 Test apparatus for determining the modulus of
    elasticity and bending strength
6 Load deflection curve for determining the modulus of
    elasticity
7 Impact strength test rig

Classification of slab types for internal use in buildings, test methods, acceptance levels, marking requirements and methods of sampling and conditioning. Includes guidance on use.

This British Standard specifies requirements for compressed straw building slabs when used internally in buildings. The classification of slab types, their performance characteristics and physical properties, test methods and marking requirements are specified.

Appendix A gives methods of sampling, conditioning and preparation of test specimens and test pieces and methods of tests.

Appendix B gives guidance on the use of compressed straw building slabs. This includes particular reference to the need for proper sealing of the cut edges to provide continuity of the surface covering and protection from moisture, mould growth and insect pests.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.