How to reduce drain pipe noise

Noise reduction is increasingly a factor in residential and commercial construction. Multi-occupancy homes, hotels, hospitals and libraries are just some of the buildings where noise reduction is paramount. This need for soundproofing has placed a demand on the construction supply chain to design in good noise reducing practices both in the construction of a building and the building fit-out. In endeavouring to meet sound controls within Building Regulations part E, additional materials and labour are required, increasing the cost and time on site.

Noise from drainage pipes is just one area where the right product can make a huge difference in soundproofing the pipework within a building.

What causes excessive waste and drain pipe noise?

The sound from soil and waste pipes can transfer into the occupied space: directly from the surface of the pipe as airborne sound; through the building structure where the pipe is not isolated from the adjacent surfaces (either through pipe supports or by direct interference); or along the pipe to and from a connected appliance. Using the correct fixing for the waste pipe can dramatically reduce these noise levels.

Introducing Walraven BISMAT® 1000 – the ‘whispering clamp’

Walraven offers a unique solution for soil and drain pipe noise in the form of the Walraven BISMAT® 1000 pipe clamp. The design and construction of this pipe clamp produce an unrivalled level of residual sound insulation – providing better soundproofing than the minimum recommended levels – as tested and documented by the well-renowned Fraunhofer Institute in Germany. Several pipe manufacturers have used the Fraunhofer Institute to test their drainage pipe systems with the Walraven BISMAT® 1000 including Pipelife and Wavin. Click here to see their test reports:

How does the Walraven BISMAT®  1000 reduce drain pipe noise?

The construction of the ‘whispering clamp’ is based on a simple yet very effective principle. It combines two pipe clamps with a specially developed sound insulation profile. A loose guidance clamp is combined with a second clamp that takes the weight of the pipe. The Walraven BISMAT® 1000 does not have a direct connection between the pipe and the structure. This is in contrast to a conventional pipe fixing which would carry the pipe weight and be directly fastened onto the structure. As a result, residual noise levels far below the recommended guidelines are achieved with the Walraven BISMAT®  1000.

best pipe clamp
best pipe clamp
best pipe clamp

Part of a system

The Walraven BISMAT® 1000 only needs to be used at certain intervals along the length of the drainage pipe, so can be used in combination with our other noise reducing clamps in the Walraven BISMAT® range to support the entire pipe system effectively, as demonstrated in the above drawing.

Find out more about our solution

To find out more about this range of noise reducing waste pipe clamps, take a look at the product pages here:

Learn more about the Walraven BISMAT 1000 product range


If you have any questions you can contact our technical team on 01295 753400 or email [email protected]

Do you want to learn more about pipe clamps?

If you’re looking for more information on pipe clamps, we recently published a complete guide to pipe clamps. The guide includes 10 sections to give an overview of types of clamps available and how to select the right one for your needs.

Learn more about pipe clamps

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