This Technical Specification gives test methods for prefabricated timber stairs. These stairs are made from timber and/or wood-based materials.The methods included in this document can also be used for single components used in stairs (e.g. steps, handrails, balusters, ...).This document does not consider the overall structure design of these elements. Stairs that are designed to contribute to the overall stability of the works or to the strength of the structure are not covered by this standard.The surfaces of the timber elements may be exposed or covered by finishes.NOTE 1 Where stairs are supplied with a finish or covering, some basic characteristics wil