In most cases, acoustic nuisance from pipes is due to:
- Architectural design,
- Poor acoustic insulation of the walls,
- Failure to respect standard practice in the installation of pipes,
- Choice of pipe materials.

In buildings, pipe noise is generated by use of the pipes and is then transmitted through air or is transmitted through the structural elements onto which they are fixed.

Therefore, noise is propagated in 2 ways:
Airborne:  direct sound is transported through air.
Solid-borne:  sound is transmitted through materials.

Most noise in pipes is due to:
- dropping noise in vertical pipes,
- impact noise at direction changes between horizontal segments and vertical columns.

Pipes with the lowest possible acoustic power (Lw) should be used as part of the effort to effectively reduce acoustic nuisance in pipes.  Thus, the intrinsic nature of the tube is of overriding importance, and a tube with a higher acoustic quality reduces noise at the source.

The nature of connections between tubes also needs to be taken into consideration because they can oppose noise propagation.  The quality of pipe attachment collars to surfaces to prevent loosening is very important because these collars reduce noise transfer from the pipe to the wall (the pipe being isolated from the wall).

Regulations:
The acoustic level of collective equipment such as valves and fittings, drops and down pipes for waste water, foul water or rain water must be as follows:

The GIRPI SOLUTION:

This is the context in which GIRPI decided to provide an efficient solution to the noise problem...by developing a complete system to limit noise propagation and perfectly satisfying regulatory requirements in force:

FRIAPHON, SILENT DRAINAGE SOLUTION                                                                                

Girpi's FRIAPHON system provides a complete solution to handle the acoustic problem as a whole (airbone noise, solid-borne noise). FRIAPHON can act firtsly on vertical drops and also on horizontal header pipes.