BS 8417:2011+A1:2014

This British Standard gives recommendations and guidance for the preservative treatment of wood to provide protection against biodeterioration in end-use situations. It gives recommendations for determining the need for treatment and specifying the type of treatment.

It also recommends levels for the penetration and retention requirements of preservatives tested to BSEN599‑1 and for boron and creosote preservatives, using the terminology used in BSEN351‑1, for different timber components and takes into account the natural durability and treatability of the wood employed, the use class as defined in BSEN335 and the desired service life. It also provides guidance on establishing whether a specified level of treatment has been achieved.

This British Standard does not include precise treatment parameters to achieve the recommended penetrations and retentions. It is the responsibility of the treater to use wood in an appropriate condition and to use an appropriate treatment schedule to achieve the recommended values.

This British Standard applies only to solid wood, including glued laminated wood. It does not apply to panel products, as no European standards have been published on the preservation of these products. This British Standard does not apply to wood, which has been modified by physical, biological or non-biocidal chemical techniques in order to enhance its performance.

This British Standard does not apply to curative treatments.

NOTE Only preservatives approved under the Control of Pesticides Regulations 1986 (as amended) [2] or authorized under the Biocidal Products Regulations 2012 [3] are permitted for the treatment of wood in the United Kingdom.