Maintenance & Refurbishment
Drainage, Plumbing & Water Management Feature
A Positive Air Pressure Attenuation system with an air admittance valve provides a drainage ventilation system that helps control nuisance air pressure regimes which otherwise would establish themselves within the soil and waste system as water building, often from great heights
Controlling the air fluctuations also has the added benefit of considerably
reducing the noise created throughout the system whenever water from WCs baths, showers, sinks and kitchen appliances is released. Together, the positive air pressure reduction device and the air attenuator
As water descends down the single stack drainage system, it creates a
negative pressure that if interrupted, or is approaching a change of direction, causes the negative pressure to change to a positive pressure which then travels back up the pipe and can create knocking or jolting noises as it passes through the drainage system. The positive air pressure reduction device acts as an attenuator tackling
positive air pressure fluctuations, and the air admittance valve tackles negative air pressure fluctuations. Therefore by installing these two components into a single stack it is possible to significantly reduce pressure fluctuations, and eliminate the requirement for secondary ventilation. Designing the secondary vent pipework out of the system saves
material and labour, creates space in the living area, reduces core drilling of the slab and means no venting through the roof, thus reducing the risk of leaks.
form a highly effective alternative solution for controlling the air fluctuations and the noise pollution within the single stack drainage system and soil stack, thereby protecting the water trap seals of appliances within the building.
HOLISTIC SOLUTIONS Employing a single stack system allows for the use of less pipework, while maximising the available floor space within the building structure. As the quality standard of residential tall buildings rises, it is important to
look for holistic solutions designed to reduce acoustic disturbances. If you liaise with an experienced and reputable manufacturer, you will be able
to receive technical and specification guidance, ensuring a high-quality, properly engineered installation.
Adam Cafer is Advantage technical manager at Polypipe Building Services
32 | HMM February/March 2021 |
www.housingmmonline.co.uk
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