ABG blueroof - Blue Roof VF HD+ 108mm - HD Void Former - Vehicle Access & HVAC-R

The ABG blueroof VF HD+ 108mm build-up provides stormwater attenuation capacity at source within the ballasted, paved roof or podium deck construction of a development.

The system comprises:

1) Restrictor chamber: The control function that restricts the outflow of water from the roof or podium areas to within the agreed discharge rates.

2) Attenuation and drainage void: Water falling on the roof surface percolates through the roof build up to the geocomposite layer. In periods of low rainfall, it simply flows through the attenuation void to the restrictor chamber and down into the roof outlet. When rainfall exceeds the maximum permissible discharge rate the void is utilised to attenuate the excess water and the discharge rate is controlled via the restrictor chamber.

3) Up to three geotextile filtration / separation layers wrapped around drainage & attenuation layers: Water passing through this layer is filtered to prevent any debris from entering the system.

Features and benefits:

• Controlled storage and release of stormwater in line with SuDS best practice / legislation
• Reduction in the number of roof penetrations and rainwater outlets (RWOs) required
• Zero fall; no need to screed to fall
• SuDS schemes; provides source control
• Contributes to BREEAM / LEED ratings
• Improves quality of discharged stormwater.
• Overall time and cost savings versus traditional methods
• Often no need to install underground attenuation tanks and the associated:

- Removal of excavated material required

- Transport and site traffic disruption

- Additional carbon footprint

Important note about specifying:

• The ABG blueroof system is compatible with inverted, warm and uninsulated roofs and waterproofing membranes accredited to zero falls (e.g. BBA accredited or similar)
• Loadings to be verified with ABG & the structural engineer, with a minimum 250mm of load bearing finish required for emergency vehicle access
• For specific advice / SuDS attenuation project calculations during the planning & design stages, please contact the ABG design department.