Due to the high density of cast iron and the buffer effect of the rubber lining in the couplings, sound
transmission is reduced to a minimum so that the system is a grant for silent drainage.
This provides the basis for general well-being in both, homes and offi ces, which is required by law and
laid down in DIN 4109
The bottom row in the table below shows the sound level, if the downpipe is not attached to the wall – that is to say it is installed independently. This test has been carried out to isolate the airborne sound from the structure-borne sound. The tests also have demonstrated that the cast iron drainage system with rapid couplings as a freestanding system emits a very low level of noise. The crucial point in sound insulation lies in the pipe
clamps for wall and ceiling installation, that is to say, in the connections of the pipe system to wall and / or ceiling. If a vibration-decoupling element is used, the sound level can be reduced even more signifi cantly (see corresponding table) until a sound level is reached which is not longer audible for human ears.
The tests focused on simulating common, real-life situations to show that those fi gures can be reproduced in both, a laboratory environment and in everyday installation on site. Hence, PREIS® SML proved to be the best choice to fulfi l the provisions of sound protection using standard products without any additional, costly measures.