The open-plan office was meant to encourage collaboration. Instead, for millions of workers — including those in Bangkok's rapidly expanding corporate districts — it has become an exercise in distraction management. The real culprit isn't the design philosophy. It's acoustics, and it's almost entirely preventable.
Businesses investing hundreds of thousands of baht in ergonomic furniture, lighting upgrades, and team-building programmes are often ignoring the single environmental factor most strongly linked to employee performance, wellbeing, and retention: the sound environment. This guide explains what's actually happening acoustically in your office, what the research says about its impact, and what a practical, cost-effective solution looks like.
The modern open-plan office is, from an acoustic engineering perspective, a very hostile environment. Hard floors (polished concrete, tile), glass partitions, suspended ceilings with minimal absorption, and the absence of full-height walls all create a space where sound travels far, reflects repeatedly, and builds up into a continuous low-level roar.
Three mechanisms are at work simultaneously:
Hard surfaces (glass, concrete, tile) reflect sound energy rather than absorbing it. A single conversation bounces off walls, ceilings, and floors, reaching every corner of the space.
Sound energy lingers in hard-surfaced rooms, causing speech to overlap itself. The result is increased listening effort, faster fatigue, and reduced comprehension.
When you can clearly make out words from a nearby conversation, your brain partially processes that content — even when you're trying to focus elsewhere. This is involuntary and unavoidable.
As ambient noise rises, people unconsciously raise their voices to be heard — which increases the ambient noise further. A self-reinforcing spiral that commonly adds 10–15 dB to noise levels over a working day.
The business case for acoustic treatment is not just intuitive — it's well-documented. Research from the University of Sydney found that the loss of privacy and the inability to concentrate are consistently rated as the top two complaints in open-plan offices worldwide. A study published in the Journal of Applied Psychology found that workers exposed to open-office noise showed reduced motivation and elevated stress hormones.
In practical terms, research suggests that it takes an average of 23 minutes to fully return to a task after a distraction. In an open-plan office where distracting sounds occur multiple times per hour, deep, focused work becomes nearly impossible without some form of acoustic intervention.
"We had invested heavily in our new office space — the design, the furniture, the layout. When we moved in, within a week we realised that the noise was a serious problem. Two teams couldn't be on calls simultaneously without constant interference. The acoustic treatment project paid for itself in the first quarter through reduced rework and faster project timelines." — Operations Director, financial services company, Bangkok CBD
This is a distinction that confuses many facility managers and architects, and it matters a great deal for how you approach a solution:
Acoustic treatment addresses the behaviour of sound within a space — reverberation, echo, sound distribution. Panels that absorb sound energy (Varitone™ panels, fabric-wrapped panels, acoustic baffles) do this work. They make a room feel quieter, speech more intelligible, and the general sound environment more comfortable.
Soundproofing addresses sound transmission between spaces — preventing sound from passing through walls, floors, and ceilings from one room or zone to another. This requires mass, decoupling, and sealing — the role of mass loaded vinyl like BlastBlock BB830, acoustic doors, and acoustic windows.
Most open-plan office noise problems require both: treatment within the open plan (absorption panels, baffles, soft furnishings) plus soundproofing between zones (meeting rooms, phone booths, executive offices, sensitive departments).
Ceiling-mounted acoustic baffles and wall absorption panels (such as IAC's Varitone™ system) reduce reverberation time. Target RT60 (reverberation time) below 0.5 seconds for speech-dominant spaces. Acoustic furniture screens add localised absorption at workstations.
Full-height partitions with BlastBlock BB830 MLV in the wall assembly prevent conversation from leaking to adjacent spaces. Acoustic doors (STC 43–64 rated) and double-glazed acoustic windows complete the acoustic envelope. Aim for STC 50+ between a meeting room and open-plan area.
Pre-fabricated acoustic booths or purpose-built enclosed phone booths using high-STC wall assemblies provide individual quiet zones without full room construction. IAC modular soundproof rooms offer a turnkey solution that can be dismantled and relocated.
Where speech privacy is critical (HR discussions, legal conversations, executive meetings), wall assemblies need to achieve STC 55+ with careful attention to flanking through floor, ceiling, and ductwork penetrations. IAC acoustic louvres and duct attenuators address HVAC transmission paths.
When fitting out or retrofitting meeting rooms, the most common failure point is the wall assembly. Standard plasterboard partitions typically achieve STC 35–40 — well below the STC 50 minimum needed for speech privacy. Adding BlastBlock BB830 between wall layers increases this substantially without requiring a full rebuild.
The cost of acoustic treatment varies significantly depending on the scope: treating an entire open-plan floor for reverberation is a different investment from soundproofing a single meeting room. However, when compared to the documented productivity losses from noise, the numbers typically look compelling.
Research from academic and corporate studies consistently shows that even a 10% improvement in focus and concentration — a conservative estimate for well-executed acoustic treatment — represents a significant return when applied across a team's annual salary cost. For a team of 50 employees at average Bangkok professional salaries, a 10% productivity improvement represents millions of baht in recovered output annually.
| Space Type | Primary Problem | Solution Priority | Typical Acoustic Target |
|---|---|---|---|
| Open-plan general area | Reverberation, distraction | Absorption panels / baffles | RT60 < 0.5s |
| Meeting room (standard) | Sound leakage out / in | Wall STC treatment + door | STC 48–52 |
| Executive / HR office | Speech privacy | High-STC wall + flanking control | STC 55+ |
| Training / presentation room | Echo, clarity | Absorption + distribution | RT60 0.3–0.5s |
| Reception / lobby | Echo, brand perception | Ceiling baffles + soft surfaces | RT60 < 0.8s |
Several acoustic product brands are available in the Thai market for office applications. Rockwool and Owens Corning offer mineral wool and fibreglass batt products that work well as cavity infill and provide good mid-high frequency absorption — they're commonly specified by architects in new construction. SCG produces acoustic plasterboard and ceiling tile systems that improve reverberation in finished spaces.
What distinguishes IAC Acoustics Thailand's offering is the combination of engineered acoustic products (including BlastBlock BB830 for blocking, Varitone™ for absorption, and the full acoustic door and window range) with genuine acoustic engineering expertise. Selecting the right product for the right application — and installing it correctly — matters as much as product selection. IAC offers consultation, specification, supply, and installation support.
If you're managing a corporate space in Thailand and dealing with noise complaints, reduced focus, or poor meeting privacy, the starting point is understanding which problem you're actually solving. Reverberation within a space requires absorption. Transmission between spaces requires mass and decoupling. Flanking noise through ducts, pipes, and structure requires specialist treatment.
A brief acoustic consultation with IAC Acoustics Thailand will identify the dominant issues in your specific space and outline a prioritised, budgeted plan — from quick wins (ceiling absorption panels) through to comprehensive treatment (STC-rated meeting room assemblies).
IAC Acoustics Thailand works with corporates, co-working spaces, and institutional clients across Bangkok and Southeast Asia to create productive, comfortable acoustic environments.
Request an Office Acoustic Assessment →Common questions about office acoustic treatment, soundproofing meeting rooms, and improving workplace noise in Bangkok and Thailand.
Reducing open-plan office noise requires two separate approaches: reducing reverberation within the space, and blocking sound transmission between areas. For reverberation, ceiling-mounted acoustic baffles and wall absorption panels (such as IAC's Varitone™ system) reduce the build-up of reflected noise. For transmission between zones, high-STC partition walls and acoustic doors prevent sound from crossing between open and enclosed areas.
IAC Acoustics Thailand can assess your specific office layout and recommend a prioritised solution — typically starting with the highest-impact, lowest-disruption measures first.
The minimum recommended STC for a general meeting room (where conversations should not be heard in adjacent open-plan space) is STC 48–50. For HR discussions, legal consultations, boardrooms, and any space where speech privacy is critical, STC 55+ is required. Most standard Bangkok office partition walls achieve only STC 35–42 — well below these thresholds.
Upgrading with BlastBlock BB830 MLV in a decoupled wall assembly, combined with an acoustic door, is the standard approach to reach STC 50+ in existing offices.
Meeting room noise leakage is usually caused by wall assemblies with insufficient STC ratings and doors without acoustic seals. The fix is adding BlastBlock BB830 MLV to the wall assembly (boosting STC by 8–12 points), fitting resilient channels, and replacing the door with an acoustic door (STC 43+). IAC Acoustics Thailand can specify and supply the complete solution.
Office acoustic treatment costs in Thailand vary widely depending on scope: adding ceiling absorption baffles to an open-plan area is a fraction of the cost of fully retrofitting meeting room walls. A single meeting room wall upgrade (adding BB830 MLV with decoupled drywall, plus an acoustic door) typically represents a modest fraction of standard office fit-out budgets — and the productivity and confidentiality benefits are measurable.
IAC Acoustics Thailand provides free consultations and project-specific quotations. Contact us to discuss your space.
Acoustic treatment controls how sound behaves within a space — reducing reverberation, echo, and the build-up of ambient noise. It makes a room sound clearer and quieter without changing what goes in or out. Products: absorption panels, baffles, soft furnishings.
Soundproofing prevents sound from passing between spaces — between a meeting room and open plan, between floors, or from outside the building in. It requires mass and decoupling. Products: MLV (BlastBlock BB830), acoustic doors, high-STC wall assemblies.
Most Bangkok offices need both — treatment for the open plan and soundproofing for enclosed rooms.
IAC Acoustics Thailand supplies a full range: BlastBlock BB830 MLV for partition walls, Varitone™ absorption panels for open-plan ceiling and wall treatment, acoustic doors (STC 43–64), acoustic windows (Rw 47–68), and duct attenuators for HVAC noise. Competitors in the Thai market include Acoustiblok (MLV), Rockwool (mineral wool batts), and SCG (acoustic gypsum board) — each suited to specific parts of an acoustic solution rather than the complete system IAC provides.
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