Guidance Note TW8 Understanding Use Class 4 (UC4). Preservative treated wood
Publication Year
2023
Document Status
Current
Abstract
The correct treatment specification for Use Class 4 levels of protection, as required by BS 8417 and the WPA Code of Practice - Industrial Wood Preservation, for wood in permanent ground or fresh water contact, or providing exterior structural support.
Document History
Issue 3: February 2023. Supersedes Issue 2: December 2020. Supersedes Issue 1: June 2020.
Publisher Information
Wood Protection Association
The Wood Protection Association (WPA) is a not-for-profit timber trade organisation. The WPA champions and provides advice on industrial wood treatment technologies that enhance the performance of softwood products. Covering: preservative treatments, wood modification and factory applied flame retardant treatments.
