VF HD+ 150 Void Former
The high density 150mm deep void former (700kpa) works in tandem with a restrictor chamber, which controls the final discharge rate into the building’s drainage outlets.
The void former acts as an “attenuation and drainage void” within the roof buildup.
- Controlled Storage: During heavy rain, it temporarily holds excess water that cannot immediately be discharged due to site-specific flow restrictions
- Source Control: By managing water at the roof level, it helps meet Sustainable Drainage Systems (SuDS) requirements and often eliminates the need for expensive underground storage tanks
- Structural Support: It provides a stable base for various surface finishes, including green roofs, paving, and even vehicle-access areas
- Material Design: Typically high-density geocomposite structures with high compressive strength.
- Void Capacity: Offers over 90% void space for maximum water storage efficiency.