Neighbour Noise Through Windows
If you can hear your neighbour's TV or conversation, the sound is almost never coming through the party wall — it's flanking around it, out of their window and into yours.
Why the party wall isn't the culprit
Modern building regs mandate around 45 dB DnT,w through a party wall — enough to drop TV noise to inaudible. Windows without secondary glazing typically leak sound at 25–30 dB, which is why flanking dominates the experience.
The mid-frequency spec
Conversation and TV noise centre around 500–2,000 Hz — the mid-frequency band that a 6.4 mm laminated secondary pane damps most heavily. Typical improvement 15–22 dB.
Practical suggestions
In flats, target the bedroom window first. In terraces, target the front reception and the main bedroom. Most owners report the neighbour is inaudible within 24 hours of install.
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