There are two complaints about meeting rooms, and they are not the same problem.
The first is I can hear the meeting next door. The second is I cannot hear the person at the other end of this table. One is about sound getting in and out of the room. The other is about what sound does once it is inside. They have different causes and different fixes, and specifying the wrong one is the most common and most expensive mistake in workplace acoustics.
Acoustic panels on the wall - the usual first purchase - only address the second problem. If your complaint is the first one, panels will not help, and you will have spent the budget before you get to the thing that would have.
Problem one: sound getting through
This is a partition question, not a panel question, and it is decided in the build-up before anything is finished.
Four things control it, and they have to be right together rather than traded against each other.
Mass. Heavier layers stop more sound. Two layers of board on each face perform meaningfully better than one. This is the cheapest improvement available and the one most often value-engineered out.
Separation. Sound travels through the studs as vibration. A partition where both faces are fixed to the same studs has a direct mechanical path between rooms. An independent double frame breaks that path; resilient bars reduce it, provided nothing bridges them — a single screw into the stud behind the bar undoes the benefit, which is the commonest site failure with resilient framing.
Absorption in the cavity. Mineral wool between the studs is worth several decibels on its own in a standard metal-stud partition — often comparable to adding a second board layer — and more again in combination with mass and separation. It is cheap, and it is not optional.
Sealing. A partition is only as good as its worst gap, and this is where most real-world installations lose the performance they were specified for.
That last point is worth dwelling on, because it is the one that turns a well-specified wall into a disappointing one.
The gaps that undo everything
A partition tested in a laboratory at a given performance and installed on site at a fraction of it has usually failed at one of these:
The head detail. A partition that stops at the suspended ceiling instead of continuing to the soffit leaves the ceiling void as an open corridor between rooms. Sound goes over the top. This is one of the most common acoustic failures in fitted-out offices, and no amount of wall panelling addresses it. Where taking the partition to soffit is not possible, a rated plenum barrier or a high-attenuation ceiling tile is a legitimate alternative - but it has to be specified deliberately, not assumed.
Service penetrations. Sockets, switches and data outlets back-to-back in the same stud bay create a direct route through the wall. Offset them by at least one stud bay and back them properly. On a fire-rated partition that means intumescent putty pads or rated back-boxes — packing insulation around a back box does not restore fire integrity and may breach the rating.
The door. A rated partition with an unrated, unsealed door performs far closer to the door than to the wall. The composite is the area-weighted average of the two, so a 45 dB wall with an unrated door in it can land below 30 dB overall. The door does not simply set the number, but it dominates it — and doors are frequently specified separately from the partition and rarely coordinated with it.
Perimeter junctions. Where the partition meets the slab, the façade or a column, an unsealed gap of a few millimetres is enough to matter. Acoustic sealant at every junction is cheap; retrofitting it after handover is not.
Ductwork. A supply and return crossing between two rooms is a duct-shaped hole in the wall. It needs attenuation designed in, not discovered later.
Flanking paths. Sound also travels around a partition rather than through it — through a continuous raised access floor, along the slab, or via façade mullions running past the wall line. On a raised floor, a partition that sits on the finished floor rather than on the slab has a void beneath it doing the same job the ceiling void does above it.
None of these are exotic. They are all decided during construction, and all of them are far cheaper to get right than to fix afterwards.
Problem two: how the room sounds inside
If the complaint is that people cannot hear each other clearly, or that the room feels harsh and tiring, the issue is reverberation — sound bouncing off hard surfaces and arriving at the ear repeatedly, blurring speech.
Modern commercial interiors are unusually good at producing this. Glass partitions, plasterboard, hard flooring and an exposed or minimal ceiling give sound almost nothing to be absorbed by. A room can be perfectly isolated from its neighbours and still be unpleasant to hold a meeting in.
The ceiling is usually the first move. In most meeting-room-sized spaces it is the largest available surface, it faces the occupants directly, and it is the one surface nobody needs for anything else — which makes it the most cost-effective place to start. In tall or narrow rooms, where the ceiling is already absorbent, or where flutter between two parallel hard walls dominates, the walls do more of the work. Room geometry decides it, not a rule of thumb.
Height placement matters for clarity rather than for total absorption. A square metre of absorber reduces reverberation wherever it sits. But absorbers at seated head height also intercept the reflections that blur speech directly between talker and listener, which is why that band is worth prioritising when clarity is the complaint. Weigh it against damage and furniture obstruction at low level - high-level absorbers survive an office better.
Soft flooring, furniture and people all absorb. An empty room measured at handover will usually sound worse than the same room in use, which is why acoustic complaints often surface in the week a fit-out completes. If a complaint persists past the first weeks of occupation, though, it is a real problem and not a settling-in effect.
Rooms have different targets
This is where generic advice fails. The same treatment is wrong in different rooms because the rooms are doing different things.
Meeting and video rooms need short reverberation and good speech clarity. Video conferencing raises the bar further, because a microphone picks up reflections a human ear would have discounted. If a room is used for calls, treat it as a video room.
Open-plan floors are a different problem entirely, and rarely one of loudness. It is intelligibility — a conversation you can understand is far more distracting than one you cannot. Reducing intelligibility rather than volume is the objective, and the tools are absorption overhead, screens and separation between neighbourhoods, and sometimes deliberately raising the background level.
Training rooms and auditoria need speech to carry, so over-absorbing them is a real risk. Absorb the reflections that blur, keep the ones that project.
Quiet rooms and phone booths are mostly about isolation, but they still need internal absorption or they are boxy and unusable regardless of how well sealed they are. The usual weak points are the door seals, the panel joints and — most often overlooked — the ventilation path, which is a designed hole between the booth and the room around it.
Healthcare and consulting rooms carry a confidentiality requirement, which raises the isolation target well above ordinary office standards. A wall that would be fine between two offices is not necessarily adequate between two consulting rooms.
Specify in this order
Get the sequence right and the budget goes where it works.
One: decide the target per room before the layout is fixed. Which rooms need confidentiality, which need clarity, which need neither. Acoustic requirements should shape where rooms go - putting a quiet room next to a lift lobby is a planning decision, not an acoustic one, but it is the acoustic problem you will inherit.
Two: specify the partition build-up and take it to the soffit wherever the target requires it, or specify the plenum barrier that replaces it. This is decided before first fix and cannot be added later without taking the ceiling down.
Three: coordinate the door, seals and service penetrations with the partition, not separately from it.
Four: use the ceiling as the primary absorber in rooms where geometry supports it.
Five: add wall absorption where the room still needs it, weighing head-height placement against durability.
Six: leave headroom to adjust after occupation. Some rooms will need more; a few will need less.
Steps one to three do add cost - soffit-height partitions need more studs, board, deflection heads and fire-stopping, and rated doors are not cheap. But it is a fraction of what the same result costs as a retrofit, where fixing a head detail means taking the ceiling down and doing the room again. Steps four and five can be adjusted at any time. Most projects do these in exactly the wrong order - panels first, partitions never.
What to ask before signing anything off
- Does the partition go to the soffit, or stop at the ceiling — and if it stops, what is doing the work in the void?
- What is the rated performance of the wall, the door, and the two together as a composite?
- Are the sockets offset, and are they backed correctly for the fire rating?
- Has anything been specified for the ducts crossing between rooms?
- On a raised floor, does the partition sit on the slab or on the finished floor?
- Is the ceiling doing any acoustic work, or is it purely a finish?
- Have the video-conference rooms been treated as video-conference rooms?
If a specification cannot answer the first two, the rest is decoration.
The short version
Sound getting through a wall and sound bouncing around a room are separate problems with separate fixes. Isolation is decided in the partition build-up and lost at the gaps - the head detail, the door, the sockets, the ducts, the floor void. Room comfort is decided mostly by the ceiling, then by absorption where the room needs it. Panels on a wall are the last step, not the first, and they cannot fix a partition that stops at the ceiling grid.
Get the build-up right while the walls are still open. Everything after that is adjustment.
Planning a workplace project?
Tirupathi Balaji Traders - TBT Group supplies partition and ceiling systems, acoustic panels and baffles, flooring, access hardware and adhesives for commercial, healthcare and institutional interiors - with specification support from design through to handover, so the build-up is decided before it is closed up.
This article is general guidance on building acoustics and is not a substitute for project-specific advice. Acoustic performance depends on the tested system, the installation and the surrounding construction; where a specific performance target must be met, it should be set and verified by an acoustic consultant.