📊BS 8233:2014 · United Kingdom

Meeting Room Acoustic Design to BS 8233:2014

Meeting rooms require controlled reverberation for clear face-to-face and video-conference communication. The small volume and hard glass partitions common in modern offices make them prone to excessive reverberation and poor speech clarity.

TL;DR

Under BS 8233:2014, a meeting room of 60-100 m³ (typical dimensions 6m × 4m × 2.8m) requires an RT60 of ≤ 0.6s at 500-2000 Hz. Background noise must not exceed 35 dBA. BS 8233:2014 Table 4 recommends RT60 <= 0.

RT60 Target

≤ 0.6s

Noise Limit

35 dBA

STI Minimum

N/A

Frequency Range

500-2000 Hz

Specific Requirements

Parameter	Target	Clause Reference	Notes
Reverberation Time (RT60)	≤ 0.6s	§7.7	500-2000 Hz, Furnished, unoccupied
Background Noise Limit	≤ 40 LAeq,T	Table 4	HVAC + building services, unoccupied
Frequency Range	500-2000 Hz	—	Octave bands for compliance assessment

Step-by-Step Compliance Calculation

1
Set RT60 target
BS 8233 Table 4: meeting rooms RT60 <= 0.6s. For video conferencing rooms, consider targeting 0.4-0.5s.
2
Calculate absorption needed
Apply Sabine equation with room dimensions. Typical meeting room (60-80 m3) needs 20-30 m2 Sabins at mid-frequencies.
3
Design ceiling and wall treatment
Specify ceiling tiles (NRC >= 0.85) and rear wall panels. Avoid placing absorption behind the display screen.
4
Address flutter echo
If parallel glass walls exist, apply absorptive film or panels to one surface to eliminate flutter echo.
5
Verify background noise
Measure HVAC noise contribution at 35 dBA limit. Fan coil units in meeting rooms often exceed this without attenuation.

Recommended Materials

Surface	Material Category	Min NRC	Coverage %
Ceiling	Mineral wool ceiling tile	0.85	80%
Rear wall	Fabric-wrapped panel	0.80	50%
Floor	Carpet tile	0.30	100%

Browse the full acoustic materials database for absorption coefficients and product specifications.

Common Failure Modes

⚠️Glass wall reflections

Full-height glazed partitions to corridors create flutter echo between parallel reflective surfaces, degrading speech clarity.

⚠️AV system interference

Video conferencing microphones pick up room reflections, causing poor remote audio quality even when RT60 is nominally acceptable.

⚠️Partition STC inadequacy

Lightweight demountable partitions provide only STC 35-40, allowing confidential discussions to be overheard in adjacent spaces.

Frequently Asked Questions

What RT60 does BS 8233:2014 require for a meeting room?

BS 8233:2014 requires a reverberation time of ≤0.6s at 500-2000 Hz for meeting room spaces. BS 8233:2014 Table 4 recommends RT60 <= 0.6s for meeting and conference rooms with background noise not exceeding 35 dBA. The standard does not specify STI targets, but achieving 0.6s RT60 typically delivers STI >= 0.60 in rooms under 150 m3.

What is the maximum background noise level for a meeting room under BS 8233:2014?

BS 8233:2014 sets a maximum background noise level of 35 dBA for meeting room spaces. This includes noise from HVAC systems, building services, and external intrusion, measured with the room unoccupied. Exceeding this limit degrades speech intelligibility and occupant comfort.

How much acoustic treatment does a meeting room need to comply with BS 8233:2014?

A typical meeting room (60-100 m³) requires Mineral wool ceiling tile (NRC ≥0.85) covering 80% of the ceiling as the primary treatment. Additional wall absorption on 2 surface(s) is typically needed. Use the AcousPlan calculator with the pre-loaded dimensions (6m × 4m × 2.8m) to calculate the exact absorption deficit for your room.

Calculate BS 8233:2014 Compliance for Your Meeting Room

Pre-loaded with typical meeting room dimensions (6m × 4m × 2.8m) and an RT60 target of 0.6s per BS 8233:2014. Enter your actual dimensions, select materials, and verify compliance instantly.

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