Meeting Room Acoustic Design to NRA 2000
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.
Under NRA 2000, 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. French NRA sets acoustic requirements for workplaces including meeting rooms.
Specific Requirements
| Parameter | Target | Clause Reference | Notes |
|---|---|---|---|
| Reverberation Time (RT60) | ≤ 0.6s | Arrêté du 25 avril 2003 | 500-2000 Hz, Per NF S31-080:2006 |
| Background Noise Limit | ≤ 35 dBA (NF S31-080) | — | HVAC + building services, unoccupied |
| Frequency Range | 500-2000 Hz | — | Octave bands for compliance assessment |
Step-by-Step Compliance Calculation
- 1
Identify NRA conference room requirements
Confirm RT60 and noise targets from NRA and Code du travail for the meeting room space type.
- 2
Design acoustic treatment
Specify ceiling and wall treatments for 0.6s RT60 target within the room volume.
- 3
Assess sound insulation
Verify partition DnT,A between meeting room and adjacent spaces meets NRA minimum requirements.
- 4
Document in acoustic report
Include meeting room acoustic design in the workplace environmental assessment documentation.
Recommended Materials
| Surface | Material Category | Min NRC | Coverage % |
|---|---|---|---|
| Ceiling | Acoustic plaster or tile | 0.85 | 80% |
| Walls | Fabric-wrapped panel | 0.80 | 35% |
Browse the full acoustic materials database for absorption coefficients and product specifications.
Common Failure Modes
⚠️Heritage building partition limits
Existing masonry walls in converted Parisian offices may not achieve DnT,A targets without additional linings.
⚠️French window noise
Tall French windows in historic buildings admit significant external noise, exceeding 35 dBA background limit.
Frequently Asked Questions
What RT60 does NRA 2000 require for a meeting room?
NRA 2000 requires a reverberation time of ≤0.6s at 500-2000 Hz for meeting room spaces. French NRA sets acoustic requirements for workplaces including meeting rooms. RT60 of 0.6s or less is recommended for conference rooms with background noise not exceeding 35 dBA. Sound insulation between meeting rooms and adjacent spaces follows NRA specifications for DnT,A.
What is the maximum background noise level for a meeting room under NRA 2000?
NRA 2000 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 NRA 2000?
A typical meeting room (60-100 m³) requires Acoustic plaster or tile (NRC ≥0.85) covering 80% of the ceiling as the primary treatment. Additional wall absorption on 1 surface(s) is typically needed. Use the AcousPlan calculator with the pre-loaded dimensions (5.5m × 4m × 2.7m) to calculate the exact absorption deficit for your room.
Calculate NRA 2000 Compliance for Your Meeting Room
Pre-loaded with typical meeting room dimensions (5.5m × 4m × 2.7m) and an RT60 target of 0.6s per NRA 2000. Enter your actual dimensions, select materials, and verify compliance instantly.
Open Calculator with PresetRelated Guides
Meeting Room under other standards
Further Reading
Complete meeting room acoustic design guide with all applicable standards, failure modes, and material recommendations.
Full NRA 2000 standard overview: scope, key clauses, all room type requirements, and implementation guidance.
Browse 5,000+ acoustic materials with absorption coefficients, NRC ratings, and specifications from 115 manufacturers.
In-depth guides on RT60 calculation, acoustic treatment design, and compliance methodology.