Q&A: Party Wall Soundproofing: What You Need to Know

Noisy neighbours and unwanted sound transmission through party walls remain a frequent concern, generating about 15-20 weekly enquiries at Hush Acoustics alone. Nationally, noise complaints are a substantial issue, with approximately 400,000 reported annually to local councils across the UK, highlighting the scale and importance of addressing this problem.

Q. Can You Reduce Sound by Treating Only a Party Wall?

We received a common enquiry that illustrates this challenge:

Hello,

I’m after some advice, please. I am considering soundproofing due to new neighbours moving in.

The noises we are experiencing are significant and disruptive.

The party wall and general noises are causing distress.

The party wall is constructed of breezeblock.

Can I achieve a decent sound reduction by only treating the party wall?

A. The Reality of Treating Only the Party Wall

Yes, it is possible to achieve sound reduction by treating only the party wall; however, it’s crucial to have realistic expectations. Eliminating noise is typically unattainable in existing buildings due to indirect sound paths, known as flanking noise.

We recently published a quick blog on the incorrect use of the term soundproofing (read it here). If you only treat the wall you are only reducing the direct sound that will be passing through the wall itself.

Flanking noise occurs when sound travels indirectly through ceilings, floors, adjoining walls, and even service penetrations such as electrical sockets or gaps. Addressing only the direct noise transmission through the party wall without considering these indirect paths will result in only partial noise reduction.

Research from Churchill Insurance (2022) showed that about one-third (31%) of UK residents experience significant disruption from noisy neighbours, though anecdotal evidence suggests the true scale may be even larger.

Party Wall Sound Insulation Solutions

Two highly effective acoustic wall systems recommended by Hush Acoustics to address sound pollution through party walls include:

HD1041 Acoustic Wall Lining: Ideal for spaces with limited room for additional insulation, this system offers a tangible airborne sound reduction of 48 dB (DnT,w + Ctr). It features a slim profile consisting of a 25mm layer of Hush Slab, Hush Multi-Panel, resilient bars, and a 15mm plasterboard, balancing performance and minimal intrusion into room space.

HD1055 Independent Stud Wall System: For those able to accommodate slightly greater depth, this system significantly improves sound isolation, offering an impressive 64 dB (DnT,w + Ctr). It includes a timber stud frame filled with a 100mm Hush Slab mineral wool sound absorber, and a double-layer Soundbloc plasterboard, creating optimal acoustic separation.

Robert Crampton, Managing Director of Hush Acoustics, states:

“Homeowners are becoming increasingly aware of the potential of today’s sound insulation products. Still, it’s important to highlight that addressing only the primary wall won’t solve flanking noise issues entirely.

For optimal results, consider additional acoustic treatments in adjacent ceilings, floors, and walls.”

Further Resources

For more comprehensive advice on soundproofing, see our dedicated mini-brochure here.

To learn more about flanking noise and how to manage it effectively, read our detailed guide on flanking noise here.

For bespoke recommendations and advice, reach out directly to our expert team at Hush Acoustics.