Flats built in the last few decades often have partition walls that stop conversation from being intelligible and stop nothing else. People then buy foam panels, a sound machine and thick curtains, and are surprised when the neighbour’s television still comes through at eleven. The two approaches solve different problems, and confusing them is the most expensive mistake in this whole area.
The difference in one paragraph
Soundproofing reduces the energy that reaches your ear and requires mass, isolation and airtightness, which means construction work. Masking leaves the noise exactly as it is and raises the background so the intrusion stands out less. Masking is cheap, reversible and tenant-friendly. Soundproofing is none of those things, and the decorative foam sold for it does not do it at all.
What masking is genuinely good at
It works on noises that are quiet but distinct: a distant television, footsteps on a staircase, a fridge compressor, muffled voices. These wake people not because they are loud but because they are sudden against silence. A steady sound at a low level removes that contrast. Small machines from suppliers such as JALL do this without a network connection and without a phone screen in the bedroom, which is the practical reason to prefer one over an app.
Volume is the part people get wrong
The instinct is to turn it up until the neighbour disappears. That level is too loud, it becomes its own sleep disturbance, and there is a legitimate criticism of running loud continuous sound all night, particularly in a room with a baby. Keep it low, keep the unit at a distance rather than beside the head, and never place it inside or on the edge of a cot. If you find yourself raising your voice over it, it has stopped being masking.
Cheap measures that do more than foam
- Seal the gap under the door, which often carries more noise than the wall does.
- Put a full bookcase against the shared wall, which adds mass at no acoustic cost to you.
- Move the bed head away from the party wall, even by half a metre.
- Fit heavy lined curtains, which help the mid and high frequencies and nothing lower.
- Lay a thick rug if the noise comes from below, since your floor is somebody’s ceiling.
Why decorative acoustic foam disappoints
Those tiles are designed to absorb reflections inside a room, which is a recording studio problem. They have almost no mass, so they do nothing to stop sound passing through a wall. Gluing them to a partition improves the acoustics of your own bedroom slightly and does not reduce what arrives from next door by any amount you will notice. Renters also lose deposits over the adhesive.
The conversation that comes first
If one identifiable person is causing the problem at specific times, deal with that before buying anything. Most noise between neighbours is unintentional and stops once somebody mentions it. Buying a device to avoid an awkward five-minute conversation is a poor trade, and it leaves you masking a noise that did not need to exist.
When building work is actually justified
Owners who are staying put, in a flat where the party wall is genuinely inadequate, may reach the point where independent wall linings on resilient bars are worth the cost. It is disruptive, it takes space off the room, and it should follow a proper assessment rather than an internet thread. For everyone else, and for all renters, masking plus sealing gaps is where the sensible money stops.