If this refers to a specific paper or presentation titled along the lines of "CD Reef v4" (or perhaps "CD" referring to a specific location or variable like "Carbon Dioxide" or "Coral Diversity"), here is why it typically generates interest in the scientific community:
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.
Before diving into the 2021 certification, it is essential to dissect the nomenclature. cd reef v4 cstb 2021
The CD Reef V4 is typically used as a subsurface stormwater detention/retention system or as an infiltration cassette. It allows developers to meet zero-discharge requirements without taking up valuable surface land for ponds or swales.
If you are a civil engineer submitting a Permis de Construire (Building Permit) or a Lotissement (Subdivision) plan in France, Belgium, or Switzerland, local water agencies (like the Agence de l'Eau) often reference the CSTB database. If this refers to a specific paper or
A product certified prior to 2021 (e.g., V3 from 2018) may not comply with the latest Zonage Pluvial (Pluvial Zoning) requirements. The 2021 certification ensures:
The 2021 revision of the CSTB evaluation for CD Reef V4 introduced several critical updates compared to prior versions (V1, V2, V3). The construction industry was shifting toward the RE2020 environmental regulation. Therefore, the 2021 dossier focused on: The CD Reef V4 is typically used as
As of 2025, the construction industry is moving toward RE2025 (the next environmental regulation). However, the CD Reef V4 CSTB 2021 remains highly relevant because it incorporates:
Forward-thinking specifiers are still using the 2021 evaluation as the baseline for projects completing in 2026-2027 because no fundamental acoustic norm has changed.