3.3 Timber preservation (natural solid timber)

3.3.6 Compatibility with metal

Measures shall be taken to prevent adverse effects from incompatibility between metal components and treated timber.

Copper-containing treatments can cause corrosion between mild steel and aluminium. Where moisture is expected, the following fittings should be used when in contact with timber treated with copper-containing preservatives:

  • occasional dampness ­­­­– galvanised fittings
  • likely wetting – austenitic stainless steel fittings.

Preservative treated timber should be re-dried to a moisture content of 22% or less before being in contact with metal fittings.

Last updated: 2nd January 2024

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