QB, Quality first
QB, the certification mark of CSTB, is for any stakeholder who puts quality assurance first, to ensure that construction works incorporate reliable products with technical characteristics certified by third-party bodies like the CSTB.
Serving professionals, QB is intended for all stakeholders - manufacturers, contractors, dealers or distributors, standards organizations and project owners - to guide them in their choices.
QB is a mark of the quality, performance and reliability of products and systems used in construction. QB also covers the certification of tools and services.
This certification promotes the know-how of construction industry stakeholders, in France and abroad.