Defines methods of specifying the characteristics of external timber cladding products from which selection has to be made and for which values might have to be agreed between the purchaser and manufacturer.

This part of BS8605 describes methods of specifying the characteristics of external timber cladding products from which selection has to be made and for which values might have to be agreed between the purchaser and manufacturer.

This part of BS8605 complements harmonized standards BSEN14915 and BSEN13986. It lists all performance requirements that might apply to external timber cladding in the UK and provides a method of specifying those requirements that are outside the scope of those standards, but which are relevant to the UK’s climate and construction practices.

This part of BS8605 specifies characteristics of components at the time they are transferred to the purchaser. It is intended for use by specifiers of external timber cladding components.

NOTE1 Suppliers can refer to this British Standard for guidance when manufacturing external timber cladding components and preparing technical documentation.

This part of BS8605 applies to external timber cladding designed to function as a rainscreen. The types of external timber cladding components covered by this standard are boards, shingles and shakes, and wood-based panels. Requirements are listed separately for each of these product types.

NOTE2 BS8605‑2 gives guidance for designers of external timber cladding assemblies and installers of such products on site. It also gives guidance on the selection of other components in the external timber cladding assembly. These include, for example, cavity barriers, breather membranes, fasteners and flashings.

This part of BS8605 does not apply to components to be used as non-rainsceen cladding, roofing, solar shading, pressure equalized cladding, double skin facades, curtain walling or any kind of wall covering intended solely for interior use. Nor does it apply to cladding made of composite materials such as fibre cement board or wood-plastic composites.