: Subscriptions typically include four quarterly updates to keep pace with evolving French and European standards and regulations Tiered Collections : CSTB offers various levels, from the Reef Collection DTU for basic requirements to the Reef Premium
| Property | CD Reef V4 (2021) | Generic EVA Foam (30 kg/m³) | Cork/Rubber Blend | | :--- | :--- | :--- | :--- | | Dynamic Stiffness | 18 MN/m³ | 55 MN/m³ | 35 MN/m³ | | Long-term creep (20 yrs) | < 2% | 15–25% | 8–12% | | Recycled content | 85% | 0–10% | 40% | | CSTB 2021 certified? | Yes | No | Varies | | Suitable for heated screed | Yes (≤60°C) | No (softens) | Yes (≤50°C) | cd reef v4 cstb 2021