The acronym stands for Recueil des Eléments Factuels et Réglementaires (Collection of Factual and Regulatory Elements). For decades, the CSTB has packaged this regulatory material into digestible, searchable software databases.
The current, web-based evolution of the physical products, which has completely replaced the CD and DVD formats. This is the reference tool used by professionals today. It boasts a database of , including more than 5,000 in full text and over 1,700 standards. It covers a wide range of topics: from legal frameworks and urban planning rules to public and private contracts, construction insurance, building pathologies, energy efficiency, BIM (Building Information Modeling), and acoustic performance. Access is via a paid subscription, with options like "Collection DTU" or "Premium," ensuring real-time, expert-curated updates.
With RE2020 emphasizing energy efficiency, the 2021 evaluation added a mandatory declaration of thermal resistance. For CD Reef V4, the R-value per 10mm thickness is approximately 0.025 m²K/W. While minimal, this contributes to lower thermal bridging in floating floor systems. cd reef v4 cstb 2021
The 2021 iteration of CD-Reef is known for containing over 10,000 regulatory and technical documents. These documents are organized logically, ensuring that users can find specific rules relevant to their trade. Key areas covered include:
Decrees, laws, and orders regarding fire safety, accessibility, and environmental performance. The CSTB 2021 Turning Point: What Changed? The acronym stands for Recueil des Eléments Factuels
The ultimate "rules of the art" ( règles de l'art ) in France. They dictate precise installation parameters for insulation, roofing, masonry, plumbing, and carpentry.
refers to the Centre Scientifique et Technique du Bâtiment (France’s scientific and technical center for building), which led the physical modeling trials. In 2021, their wave flume—one of Europe’s largest—ran three months of storm simulations on a 1:10 scale model of CD Reef V4. This is the reference tool used by professionals today
Users can export relevant sections for inclusion in technical briefs or print them for on-site reference. Professional Use Cases User Profile Primary Benefit Architects
Before diving into the 2021 certification, it is essential to dissect the nomenclature.
is a fourth-generation resilient acoustic underlayment, primarily manufactured for use under cementitious and anhydrite screeds. Unlike traditional foam or rubber underlays, the "Reef" series utilizes a high-density recycled elastomer matrix, often incorporating granulated rubber bonded with polyurethane resins. The "V4" designation signifies the fourth version of this product line, incorporating improvements in compression resistance, thermal conductivity, and long-term creep behavior based on feedback from prior installations.