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Valsir S.p.a
Waste and water
supply systems, underfloor heating system
and flush cisterns


Significant acoustic performance.


When a waste system is in use, noises are generated inside the pipelines causing it to vibrate from the fall of the liquid being discharged

Most of the noise generated spreads inside the pipe but the vibrations that are generated are transmitted from the walls of the pipe to the surrounding area and to the bracketing systems and consequently to the building structure.

To minimize noise levels in waste and drainage systems, not only should the system be properly designed and the waste circuit be mounted correctly, but it is also important to choose a system with an elevated soundproofing performance.

PP/PP3®  allows waste systems to be installed that guarantee excellent soundproofing performance, with 2 l/s (typical toilet flush) noise emissions of 17 dB(A) were measured.

Waste systems with excellent acoustic performances

17 dB(A) rumour levels with a 2 l/s WC flow rate.

The measurement of the soundproofing performance of waste systems

The reference standards used to evaluate the performance of waste systems in the laboratory and which specify the measurement methods are German Standard DIN 4109 (together with DIN 52219) and European Standard EN 14366.

Both standards require the use of a four-storey building with an inside wall in concrete to which the waste stack is anchored.

The measurement floors are divided into two rooms: the front room is where the waste stack is installed, the rear room has no pipes running through it but receives the sound vibrations in the partition wall. The values measured can be expressed with different indicators depending on requirements and the reference standards.

LSC,A is the indicator required by EN 14366 and indicates the structural-borne noise level transmitted whereas LIN is an indicator that also takes air-borne noise into consideration required by DIN 4109.

It doesn’t matter which indicator is more important, the aspect that needs to be taken into consideration is that in order to compare different waste systems the same indicator must be used.

The actual noise levels of a waste system can only be measured on site, in that noise emissions depend on numerous factors, such as the installation and the type of building; laboratory indicators are only to be used as a means of comparison.




Valsir provides complete support both during the planning phase and on site, thanks to a first-class technical office made up of a team of highly experienced engineers, capable of dealing with the most complex system requirements.

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