BS DD239(1998) : 1998

Committees responsible
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Use of these recommendations
Annex A (normative) Timber components grouped according
to service environments
Annex B (informative) Decision process for using preservative
treatment
Annex C (informative) Design factors in Table 9
Bibliography
Table 1 Service factors based on safety and economic
          considerations
Table 2 Natural durability recommendations for timber
          components
Table 3 Summary of penetration classes and analytical zones
          for determination of retention in accordance with
          BS EN 351-1
Table 4 Treatment recommendations for copper/chromium/arsenic
          (CCA) preservatives conforming to BS 4072-1
Table 5 Treatment recommendations for creosotes conforming
          to BS 144
Table 6 Treatment recommendations for organic solvent-based
          preservatives conforming to BS 5707
Table 7 Treatment recommendations for aqueous solutions
          of boron compounds applied by diffusion to
          green timber
Table 8 Treatment recommendations for aqueous solutions
          of boron compounds applied to dry timber
Table 9 Treatment recommendations for preservatives for
          which an appropriate CV as described in
          BS EN 599-1 is available
Table A.1 Examples of timber components within each component
          group listed in Table 2 and Tables 4 to 9
Table B.1 Stages of the decision process for using wood
          preservative treatment

Provides information and guidance for specification of treated timber in order to provide protection from biodeterioration in certain defined end-use situations in the UK.