3.3 Timber preservation (natural solid timber)

Also see:

2.1

3.3.1 Compliance

Timber preservative treatments and processes shall comply with the Technical Requirements and reasonably ensure that the timber is safely and satisfactorily protected against fungal decay and insect attack for the Use Class and Desired Service Life of the component.

Timber and external joinery should either:

  • have adequate natural durability against fungal decay and insect attack, or
  • be treated with preservative in accordance with BS 8417 and this chapter.

It is important that treatment of timber and joinery is carried out to appropriate standards which are both suitable and safe. Treatments in accordance with procedures set out in British Standards, Codes of Practice, or which have been satisfactorily assessed by an independent authority in accordance with Technical Requirement R3, will generally be acceptable.

The treatment specification should state the:

  • component type, and
  • Use Class, and
  • Desired Service Life, and
  • may also include the timber species, specific treatment and standard required where appropriate.

Preservatives used in England, Scotland and Wales should meet the requirements of The Biocidal Products (Health and Safety) (Amendment) Regulations 2022 or The Control of Pesticides Regulations (1986 as amended) administered by the Health and Safety Executive. Preservatives used in Northern Ireland should be authorised under the EU Biocidal Products Regulation. The safety instructions published by the manufacturers should be followed.

Last updated: 2nd January 2024

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