![]() ![]() ![]() These are described in our dedicated interactive catalogue on spiral staircases that you can download from our website: click here We offer a wide range of finishes and technical solutions. PBM offers a diverse range of precast spiral staircases The precast concrete stairs NF mark came into force in 2008.guarantees the buyer that the stairs are designed for building structures in accordance with good professional practice and, specifically, with the French DTU code of practice.guarantees that the product performance requirements have been audited by an independent body and that the manufacturer has been found to comply with these requirements in a sustainable and continuous manner.certifies that the stairs meet a performance level conform to NF certification rules.This means that not all CE-marked products necessarily have the level of performance required to conduct building work in accordance with good professional practice such as defined in the French DTU code of practice. Where harmonised features are involved (requirements given in Annex ZA of standard NF EN 14843), CE marking requires a manufacturer to declare performance values but does not enforce minimum values. Some staircases have both CE and NF marking as extra evidence of their quality. Why have both NF and CE marking and what is the added value?
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