ACO TECHNOLOGIES PLC - BUILDING DRAINAGE
Suppliers of: Internal and external drainage solutions, stainless steel floor drains, stainless steel gullies and channels, rainwater outlets, shower floor drains, bathroom and wet room floor drains, internal linear drainage channels, access covers, grease separators
ACO Building Drainage specialises in the development of corrosion resistant drainage systems and building products for applications across the internal and external built environments. Conceived to eliminate design risk, to optimise installation and to minimise lifetime ownership cost, every product in the range delivers exceptional levels of performance, finish and durability.
The technical expertise, global resources and fabrication capacity within the ACO Building Drainage division make it possible for architects, engineers and contractors to realise the highest quality and value when selecting from our standard products, or, when using our bespoke design service.
Indeed, whether you’re involved in designing or building a new project or upgrading an existing building, every aspect of the system must be carefully planned to meet the correct drainage requirements simply, quickly and within budget. Just call us for advice and help on the right system for your next project!
ACO BIM Files: This link will take you to the ACO BIM Library on the ACO website
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ACO Building Drainage’s extensive portfolio includes:
An extensive range of Wetroom products and shower drainage solutions.
Choice of ranges for different applications: Fixed Height and Telescopic gully systems, EG150 Eurogully range, Rodding Eyes, Micro Floor Gullies and Bespoke gullies.
Includes the Modular 125 stainless steel channel system and the Deckline 125 galvanized steel shallow invert drainage system.
ACO PIPE® presents a wide range of socketed waste pipework systems in thin-wall stainless steel for above and below ground drainage applications.
ACO HygieneFirst drainage systems fulfil the stringent hygienic requirements to minimise harmful bacteria and pathogen contamination of food arising from drainage elements by applying relevant hygiene design principles reserved for food contract surfaces
Products include FreeDeck - Level Access Flat Roofs and Terraces Drainage Systems & Watertight Rainwater Outlets.
Our engineers and designers can advise you on the right system to suit your project.
The range includes mobile grease separators, gravity grease separators, grease recovery units and grease traps. Visit our website to use our grease selector to find the right unit for your needs.
Products include the Uniface or UniTop range of aluminium or steel access covers.
Our ACO RoofBloxx rainwater attenuation system is designed specifically as a green roof drainage layer for use on blue, green and blue/green roof construction applications. Please contact us to discuss project requirements and for support with hydraulic calculations.
Anti-flood backflow valve systems, designed to prevent flooding resulting from sewer backflows. With models suitable for grey or black water applications, all systems are designed for reliable operation and long life.
Further technical information is available in the BPi download library or on the ACO Building Drainage website.
ACO RoofBloxx being installed at Chalk Farm
Blue Roof Solution for Chalk Farm
Two unique semi-detached dwellings have been constructed in Chalk Farm, London featuring an unusual roof design, the roof area covers a total of 46.03 square metres and is divided into six sections comprising two roof lights and three blue roof areas.
Single ply membrane manufacturer RENOLIT ALKORPLAN roofing products and their Approved Roofing contractor Paul Gribben of Gribben Solar Roofing Limited, approached ACO Building Drainage to provide an alternative blue roof solution to the one original proposed.
ACO was asked to provide a practical blue roof solution for the development.
ACO Building Drainage’s in-house technical design team designed an alternative ‘warm roof construction’ blue roof system comprising ACO RoofBloxx units and ACO blue roof flow restrictors.
The ACO team was able to produce hydraulic calculations for its blue roof system which satisfied planning requirements and the needs of the project architects.
The ACO team subsequently provided comprehensive on-site support to assist with and oversee the installation of outlets, flow restrictors and the ACO RoofBloxx units. The system was delivered to site on time and on budget.
Tony Brown, National Technical Manager for RENOLIT ALKORPLAN roofing products, comments: “ACO provided us with a cost-effective, high performance blue roof system and market-leading technical support throughout the project. The system they developed and the technical advice provided were absolutely critical to the success of this project and we are extremely happy with the service provided.”
ACO RoofBloxx is a complete roof attenuation system for blue, green and blue/green roofs. It enables engineers to create a drainage platform that gives architects the design flexibility required to create imaginative, multi-functional open green spaces at roof or podium level.
To learn more visit https://www.aco.co.uk/blue_green_roofs
ACO Blue/Green Roof Design Dilemma
Sustainable drainage systems (SuDs) are essential for effective rainwater management and blue/green roofs have an important role to play. Increasingly, their specification is being driven by regional guidance and planning requirements, with major cities, such as London, which already has 700 green roofs, wanting to increase their percentage of green cover further. When it comes to designing effective blue/green roof rainwater attenuation systems, it is essential to understand competing drainage requirements. This is what we call the design dilemma.
The design dilemma
This is a major challenge faced by architects, civil engineers, designers, and most notably MEP engineers. Blue/green roofs are flat, and as a result are required to be designed to the British Standard for gravity drainage on flat roofs, BS EN 12056-3:2000. However, the reality is that the primary drainage function of a flat roof and a blue/green roof are not the same. One requires the roof to drain very quickly in an extreme event (a conventional flat roof), and the other slowly. As a result, the design of a blue roof attenuation system is at odds with the British Standard. Unlike conventional flat roofs, blue roof attenuation systems are designed to retain water for up to 24 hours or longer. This creates a dilemma for the designer of any blue/green roof attenuation system. Put simply, do they design to BS EN 12056-3:2000 or to meet planning conditions and performance requirements? With standard blue roof systems it is very difficult to do both!
The current compromise
The roofing industry and its suppliers have developed solutions that offer a single roof waterproofing layer and a modified drainage system that aims to accommodate both drainage extremes. However this approach by its very nature involves a degree of compromise, and therefore also requires an acceptance of increased risk – a failed blue roof will not create a leak but a ‘flood’. For this reason, there is a reluctance to employ these systems over habitable and sensitive buildings, which limits the extent to which they can contribute towards the mitigation of climate change.
ACO believes that the solution to the design dilemma is to separate the competing requirements into distinct issues, with a specifically engineered blue roof attenuation system that simplifies design responsibility without compromising performance of the roof or the drainage. By creating a separate, but linked, attenuation system that sits above the standard roof waterproofing and flat roof drainage system, the ACO RoofBloxx system enables engineers to design to BS EN 12056-3:2000, and to meet planning conditions without compromising either requirement.
The ACO system also delivers the following additional benefits. The roof waterproof membrane is not compromised so there are no warranty issues. It can operate on half drain down time in 24 hours so it’s compatible with standard civil hydraulic calculations. Inverted roof designs – the most common type of blue, blue/green roof design – can be achieved without a reduction in U-values or potential buoyancy issues. They are also suitable for use above habitable areas due to the increased resilience of separate waterproofing layers. ACO’s in-house design team can assist with attenuation sizing and the design of blue roof drainage systems, including modelling the behaviour of the roof during various storm events.
The unique drainage requirements of blue/green roofs and the need for any blue/green roof rainwater attenuation system to form part of the wider SuDs scheme means that the initial hydraulic design of the system tends to be undertaken by a civils drainage specialist. However, the detailed design often falls to other design specialists, who are not usually equipped with the tools to undertake this process. While a blue/green roof is an integral part of any roof build up it is important to note that its primary function is that of a rooftop SuDS solution.
Surface water management systems for blue roof applications are fundamentally different to conventional drainage systems. It is therefore essential that any blue roof attenuation system is designed by a drainage specialist who understands the key differences with regards to functionality and design.
Collaboration is the key to success
The design requirements of a blue roof include everything from non-standard drainage flow rates to differing structural loads, fire break and wind lift considerations. Consequently, it is important that drainage companies, architects, engineers and roofing contractors work collaboratively and pool their specialist knowledge to ensure that every aspect of a blue/green roof design is fit for purpose. Only by adopting this approach, can the industry address the design dilemma and ensure that the blue/green roofs we create today meet the needs of tomorrow’s sustainable urban environments.