The Timber Pressure Treatment process forces a copper-based treatment fluid into the timber. When the wood has dried, the treatment is locked into the wood. It is safe to touch, although we recommend wearing gloves and washing hands well before eating or smoking. Please read our guide to the safe handling of treated timber.

Treated timber that has been crosscut, notched or drilled must be retreated using a good quality Endseal to reinstate the protective layer.

Most of our timber is pressure treated with a “Tanalith ” preservative.

Timber is treated to different Use Classes (UC) depending on what end-use the Timber is intended for.

The Timber we stock is treated to UC 3 or 4.

  • UC 3 is for external use above ground
  • UC 4 is for external use in ground contact

  • Timber pressure treatment infographic

      The pressure Treatment Process