Expert solutions for challenging installations |
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Where external constraints demand under-structure attenuation systems, specialised expertise for design, installation, and maintenance is required. That’s because under structure systems, especially those sited in the building’s foundations, raise complex questions relating to structural integrity, water management, inspection, and maintenance. It’s therefore essential to work with experienced, knowledgeable partners. ADS are globally recognised as technical experts in this field. Our recent Technical Note gives further details. |
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Start with the car park
Where possible, design the car park on the lowest level of the building, directly above the attenuation system. This is because the underlying soil is likely to have already been evaluated for both the structure’s foundation system and the required load bearing capacity. Crucially, the car park also allows for easy access for inspection and maintenance, which is essential for maintaining the performance of the system. It is important that such systems are installed above the seasonal high groundwater level, even if buoyant conditions can be managed.
ADS StormTech is ideally suited to car park applications as the standard installation guidance relates to hgv traffic loads.
No standard specifications
Currently, there are no standard specifications for installing stormwater attenuation systems beneath buildings. Pipe manifolds and connections into the attenuation system should conform to standards such as BS EN 752 and BS EN 16933-1, with additional guidance from relevant pipe and attenuation system manufacturers.
Structural integrity and loading
It is vital that the attenuation system does not adversely affect the structural integrity of the building, and that no structural loads – however minimal - are transferred from the building, whether through piers, columns, footings, or walls etc. Proof rolling and temporary shoring may also exceed the allowable loading on the attenuation system, and never use a mat or raft foundation, as a continuous slab will transfer the weight to the underlying soil.
With their flexibility and structural integrity, StormTech chambers are suitable for under structure applications, provided they are designed and installed correctly. |
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Liners
To create a fully contained system, liners may be necessary to prevent water exfiltration into the soil or foundations. Common liner materials include PVC, LLDPE, EPDM, or geosynthetic clay liners. If a liner is not used, geotechnical and structural engineers should evaluate soil conditions and foundation impacts to ensure water does not adversely affect the structure.
Inspection
Inspection is recommended during installation, backfilling, and 30 days post-installation. Construction activities, such as foundation work and crane operations, must be carefully managed to avoid placing excessive loads on the buried system.
Global expertise
Under-structure attenuation is a specialized solution best suited for parking areas at the lower levels of buildings. A properly designed and installed StormTech system is ideal for these applications, particularly given its capacity to handle heavy vehicle loads. In all circumstances, designers and contractors should consult ADS to review loading and proximity to the attenuation system.
ADS offers comprehensive technical support for design, installation and maintenance, 24/7, 365 days a year. And for further information, why not try our highly rated CPD programme – simply call 0203 442 0607 or email |
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No wonder that ADS StormTech is the world’s leading proprietary subsurface stormwater attenuation system. Compared to the alternatives, the benefits are substantial. |
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ADVANCED DRAINAGE SYSTEMS |
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StormTech is manufactured by ADS, America's largest manufacturer of thermoplastic corrugated drainage pipes and a specialist in water management systems. StormTech has a long and successful track record with over 50,000 system installations using in excess of 3 million units. |
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To book a CPD seminar or to contact ADS UK call 0203 442 0607 or click here |
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