ACO Blue Roof Flow Restrictor
ACO BLUE ROOF FLOW RESTRICTOR
The ACO Blue Roof Flow Restrictor and overflow offer a means of controlling the rate of rainwater run-off from a blue or green roof without overloading the roof structure. The restrictor and overflow have been primarily designed for use with the ACO range of HP vertical spigot and screw, 45- and 90-degree roof outlets and accessories, however other types and make of roof outlet can be accommodated
The design of the restrictor is individually tailored to suit the site-specific requirements for each blue or blue green roof allowing the SuDS design to be optimised. The design of the flow restrictor(s) can be carried out with tailored roofs designed to BSEN12056-3:2000 and/or to attenuation sizing principles. The number and size of flow restrictors required is project specific, and Individual overflows should be provided to all roof outlets not fitted with a flow restrictor.
ACO’s in-house design team will calculate the size of restrictor required and provide technical advice and guidance throughout the life of your project.
ONE
Manufactured from from corrosion-resistant 304 grade stainless
TWO
Built-in overflow with vertical orifice option – provides a failsafe drainage solution
THREE
The orifice height can be positioned so water can be retained on the roof for passive irrigation of a green roof.
FOUR
Larger single orifice is less prone to blockages – applies to vertical and horizontal orifices if the system is designed using attenuation principles
FIVE
Wide flange allows a secondary liner (if needed) to be dressed and sealed around the outlet without disturbing the roofing membrane seal.
SIX
The position of the orifice ensures that the roof membrane clamp ring seal is not subjected to prolonged periods of hydrostatic pressure when surcharged.
SEVEN
Coded solid cover (with vent) ensures the restrictor position is easily identified and prevents debris from entering and potentially blocking the outlet.
Features
- Manufactured from corrosion resistant 304 grade stainless
- Built-in overflow with orifice control provides failsafe drainage solution
- Orifice height can be positioned so water can be retained on the roof for passive irrigation.
Benefits
- Larger single orifice is less prone to blockages
- Wide flange allows secondary liner (if required)
- Orifice position ensures the roof clamping seal is not subjected to prolonged periods of hydrostatic pressure
- Coded solid cover with vent for easy restrictor position identification
- Debris prevented from entering and blocking the outlet by coded solid cover
Recommended Applications
- Active and passive blue roof applications
- Green / 'living' roofs
- Blue/green roof applications with or without passive irrigation systems
- Roofing systems that form part of a podium deck or green roof system
Featured Downloads
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Read this guide about how Blue Green Roofs can be designed to drain slowly in normal use and quickly in extreme conditions, using ACO RoofBloxx
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A Design Guide to the ACO RoofBloxx system showing the build ups for a variety of roof types. Don't forget we can help with calculations for any roof.
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