Restaurant Acoustic Design to ISO 3382-1:2009
Restaurant acoustics must balance conversation intelligibility with ambient atmosphere. Excessive reverberation triggers the Lombard effect, where diners progressively raise their voices, creating an escalating noise spiral that can reach 85+ dBA at peak service.
Under ISO 3382-1:2009, a restaurant of 300-500 m³ (typical dimensions 15m × 10m × 3.5m) requires an RT60 of ≤ 1s at 500-2000 Hz. ISO 3382-2:2008 provides the measurement methodology for restaurant reverberation assessment.
Specific Requirements
| Parameter | Target | Clause Reference | Notes |
|---|---|---|---|
| Frequency Range | 500-2000 Hz | — | Octave bands for compliance assessment |
Step-by-Step Compliance Calculation
- 1
Measure RT60 per ISO 3382-2
Conduct measurements in furnished, unoccupied condition with music and extraction systems off.
- 2
Assess spatial decay
Optionally measure spatial sound decay per ISO 3382-3 to quantify conversation privacy between tables.
- 3
Monitor during service
Log LAeq during peak service to correlate RT60 with experienced noise levels and conversation comfort.
- 4
Report findings
Document RT60, spatial decay, and in-service noise levels per ISO 3382 reporting requirements.
Recommended Materials
| Surface | Material Category | Min NRC | Coverage % |
|---|---|---|---|
| Ceiling | Acoustic treatment | 0.75 | 55% |
| Soft furnishings | Upholstery and drapes | 0.55 | 25% |
Browse the full acoustic materials database for absorption coefficients and product specifications.
Common Failure Modes
⚠️Measurement during closure only
Restaurant RT60 measured when empty does not represent the acoustic experience during service with patron absorption.
⚠️Background music masking results
Background music systems interfere with RT60 measurement accuracy if not switched off during testing.
Frequently Asked Questions
What RT60 does ISO 3382-1:2009 require for a restaurant?
ISO 3382-1:2009 requires a reverberation time of ≤1s at 500-2000 Hz for restaurant spaces. ISO 3382-2:2008 provides the measurement methodology for restaurant reverberation assessment. Restaurant acoustics increasingly use spatial decay measurements from ISO 3382-3 to quantify speech privacy between dining zones and conversation comfort at individual tables.
Does ISO 3382-1:2009 set a background noise limit for a restaurant?
ISO 3382-1:2009 does not specify a background noise limit specifically for restaurant spaces. For noise criteria, refer to complementary standards such as BS 8233 or ASHRAE Handbook Chapter 49, which provide recommended background noise levels for this room type.
How much acoustic treatment does a restaurant need to comply with ISO 3382-1:2009?
A typical restaurant (300-500 m³) requires Acoustic treatment (NRC ≥0.75) covering 55% 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 (15m × 10m × 3.5m) to calculate the exact absorption deficit for your room.
Calculate ISO 3382-1:2009 Compliance for Your Restaurant
Pre-loaded with typical restaurant dimensions (15m × 10m × 3.5m) and an RT60 target of 0.8s per ISO 3382-1:2009. Enter your actual dimensions, select materials, and verify compliance instantly.
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Further Reading
Complete restaurant acoustic design guide with all applicable standards, failure modes, and material recommendations.
Full ISO 3382-1:2009 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.