Timber preservation (natural solid timber)

3.3.6Compatibility 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.

Timber treated with copper containing preservatives should be re-dried to a moisture content of 20% for at least seven days before being in contact with metal fittings.