Understanding Use Class 4 (UC4)

Understanding Use Class 4 (UC4)

Date Published

21 September 2021

Document Type

Category

Audience

Author

TDUK
Summary

Consumer and contract law require that any product offered for sale must be fit for its intended use and a wood product impregnated with preservative is no exception.

The minimum standards for the treatment of wood are set out in British Standard BS8417 (Preservation of Wood: Code of Practice). In this standard, the level of treatment is tailored to the application ‘Use Class’ of a wood product as defined in BS EN 335 (Durability of wood and wood-based products).

Use Class 4 is for end uses where wood is in contact with or very close to the ground and frequently wet.

Case studies

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