Understanding Use Class 4 (UC4). Preservative treated wood
Guidance Note TW8
Document Status
Current
Supplement
Building Supplement
Series
Guidance Note
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.
History
Issue 3: February 2023. Supersedes Issue 2: December 2020. Supersedes Issue 1: June 2020.
Subjects
- Coverings and surface finishes
- Surface finishes
- Wood preservatives
Publisher History
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.
Information
NBS
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
Accuris
We connect trusted knowledge to customers' workflows – mitigating risk, increasing efficiency and accelerating innovation For more than 60 years, leading R&D and engineering-intensive organizations have relied on us to achieve on-time, on-budget delivery of complex projects and new products. We deliver an unparalleled combination of technical content and Artificial Intelligence (AI) technologies to surface answers from the vast universe of technical knowledge, both inside and outside the organization. In a single interface, we connect the dots between information scattered across many different sources, allowing technical professionals to make better, more informed decisions faster.