As a member of the Timber Development UK, we want to ensure our buyers get the best from our timber so understanding the classifications is vital.
The preservative treatment provides the wood with added durability. However, it’s a mistake to assume that all pressure-treated wood is the same. Whilst one piece of treated wood may look very much like any other, the level of preservative protection could be very different.
That’s because national technical standards for wood preservation require that the loading and penetration of preservatives, impregnated into the wood, is tailored to the desired end-use.
What class should you use?