Preservative treatment provides wood with added durability (against decay and insect attack). But, it’s a mistake to assume that all treated wood is the same. The level of preservative protection required depends on where it is to be used.

To ensure best value for money and long service life, follow the Ground Rules

The WPA Code of Practice for Industrial Wood Preservation (January 2021) groups the applications for treated wood into Use Classes, the main three being:

Interior: Use class 2

Exterior: Use class 3(u) and Use class 4

I'm interested in:

• builders
• Building
• Preservative Treatments
• Use Class 4