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David Barker, Soil & Waste Category Manager at Marley Plumbing & Drainage explores the importance of specifying drainage systems for hotels with high quality acoustic performance.





In buildings such as hotels, the need to minimise the sound of water gurgling through soil and waste pipes is essential in providing a quiet environment for guests.





building. Indeed, poor acoustic design can lead to all manner of health problems.


R


Sound is generated by almost all daily activity. Two main types of noise can be transmitted


throughout a building: airborne and structure-borne.


Airborne sound refers to noise produced from vibrating air particles, e.g. people talking, televisions and wastewater flowing inside a drainage pipe system. Structure-borne sound occurs when an object impacts on another, such as vibrations passing through brackets to the building’s structure, resulting in the transmission of noise. In buildings such as hotels, the need to minimise the sound of water gurgling through soil and waste pipes is essential in providing a quiet environment for guests.


Approved Document Part E of the Building Regulations – Resistance to the Passage of Sound – states that pipes and ducts that penetrate a floor separating habitable rooms should be enclosed or wrapped with an un-faced mineral fibre. Indeed, there are many reasons why indoor drainage systems could cause unnecessary noise, such as


HOTEL & LEISURE BSEE Noise. It’s a serious matter! educing noise


pollution is essential to promoting the well- being and comfort of people working, living or learning in a


the choice of the system, the brackets and the actual installation design of the soil and waste system. Therefore, it is crucial to select pipes with the appropriate acoustic performance.


Which pipes?


Deciding which pipes to install has long been a key issue but by using a lightweight push-fit plastic system, installation will be quick and easy. When it comes to choosing an acoustic drainage system, it is recommended that a layered plastic drainage pipe is specified. Each of the pipe layers has an individual function: the inner skin is resistant to high temperatures – up to 95°C (short term), while the central layer provides structural strength and noise reduction capabilities. The outer layer provides


exceptional impact resistance and protection against severe weather conditions. This layered construction absorbs sound waves and reflects them inwards, significantly reducing the transmission of noise to the system’s surroundings. It is also important to use pipe brackets designed specifically for acoustic systems to limit the acoustic vibrations passing into the building’s structure. New to the Marley dBlue system is the Phonoklip, a patented acoustic body bracket, encompassing a unique body section which absorbs


noise generated from pipework into the building structure.


When installing an acoustic system, it is recommended that the bracketing system is installed on the heaviest and thickest wall, which will reduce any residual contact noise and absorb sound further.


Triple‐layered


The Marley dBlue acoustic system consists of a triple-layered pipe that provides a quick and hygienic removal of sanitary wastewater. When used in conjunction with the Phonoklip, the system reduces acoustic vibrations to a level of 16dB at 4 l/s and to 10dB at 2 l/s. The noise generated by the flow of water is dramatically reduced – making it perfect for hotels that need a peaceful, calming and quiet environment.


It is also vital that the system is designed and installed in a manner that will further aid sound reduction. A supplier’s technical team, such as the one at Marley, will provide a full design service for customers who use their products, where CAD drawings or floor plans are used to produce schematic layouts in line with Building Regulations and British Standards.


These layouts are produced with all of the relevant product reference codes to make up the drainage design for a project. It will also help to reduce over ordering and on-site installation waste.


A collaborative approach to a project will result in design efficiencies and cost savings in line with best value principals, benefiting all involved.


www.marleypd.co.uk


VISIT OUR WEBSITE: www.bsee.co.uk


BUILDING SERVICES & ENVIRONMENTAL ENGINEER AUGUST 2017 9


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