When a conflict is found, the assistant would provide direct links to the relevant CSTB Guide or a video demonstration from the Reef Media Library showing the correct installation method.

For professionals involved in stormwater management, infiltration systems, or subsurface retention, understanding this specific certification is not merely a technical detail—it is a legal and functional necessity. This article provides a comprehensive breakdown of the CD Reef V4, its CSTB (Centre Scientifique et Technique du Bâtiment) appraisal from 2021, and why this combination of letters and numbers dictates specification choices for major infrastructure projects.

From "Architecture and Urbanism" to "Building Physics," the tool covers the entire lifecycle of a project. How to Get Started

The V4 iteration represents the transition toward more dynamic, online-compatible services. While originally distributed as physical media, the Reef product line now emphasizes quarterly updates (4 per year) to ensure professionals are never working from obsolete code.

The year 2021 saw the acceleration of the Règlement Environnemental 2020 (RE2020) in France. The CD Reef V4 aligns perfectly with these goals: