🏐ISO 3382-1:2009 · International

Gymnasium Acoustic Design to ISO 3382-1:2009

Gymnasiums are among the most acoustically challenging room types due to their large volume, all-hard surfaces, and requirement for both physical activity and verbal instruction. Untreated gymnasiums commonly have RT60 of 3–5 seconds, rendering speech intelligibility for physical education instruction and emergency announcements unacceptable.

TL;DR

Under ISO 3382-1:2009, a gymnasium of 1,500-2,500 m³ (typical dimensions 30m × 18m × 7m) requires an RT60 of ≤ 1.5s at 500-2000 Hz. A minimum STI of 0.45 is required for speech intelligibility. ISO 3382-2:2008 provides the measurement methodology for gymnasium reverberation assessment.

RT60 Target

≤ 1.5s

Noise Limit

N/A

STI Minimum

≥ 0.45

Frequency Range

500-2000 Hz

Specific Requirements

Parameter	Target	Clause Reference	Notes
Frequency Range	500-2000 Hz	—	Octave bands for compliance assessment

Step-by-Step Compliance Calculation

1
Account for non-diffuse field
In large gymnasiums, consider Eyring or ray-tracing methods rather than Sabine for more accurate RT60 prediction.
2
Measure per ISO 3382-2
Use multiple source-receiver positions distributed across the floor area to capture spatial variation.
3
Report T20 and T30
Report both T20 and T30 as double-slope decays may cause significant differences between the two measures.
4
Assess PA STI
Measure STI at worst-case positions for the PA system per IEC 60268-16 methodology.

Recommended Materials

Surface	Material Category	Min NRC	Coverage %
Ceiling	Acoustic baffles	0.80	40%
Walls	Impact-resistant absorber	0.70	25%

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

Common Failure Modes

⚠️Non-diffuse sound field

Large rectangular sports halls with absorption concentrated on the ceiling create non-diffuse fields that complicate Sabine predictions.

⚠️Double-slope decay curves

Concentrated ceiling absorption produces dual-slope decay curves where early and late RT60 differ significantly.

Frequently Asked Questions

What RT60 does ISO 3382-1:2009 require for a gymnasium?

ISO 3382-1:2009 requires a reverberation time of ≤1.5s at 500-2000 Hz for gymnasium spaces. ISO 3382-2:2008 provides the measurement methodology for gymnasium reverberation assessment. Large sports halls present measurement challenges due to non-diffuse sound fields and the influence of suspended equipment on decay curves.

Does ISO 3382-1:2009 set a background noise limit for a gymnasium?

ISO 3382-1:2009 does not specify a background noise limit specifically for gymnasium 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 gymnasium need to comply with ISO 3382-1:2009?

A typical gymnasium (1,500-2,500 m³) requires Acoustic baffles (NRC ≥0.8) covering 40% 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 (30m × 18m × 8m) to calculate the exact absorption deficit for your room.

Calculate ISO 3382-1:2009 Compliance for Your Gymnasium

Pre-loaded with typical gymnasium dimensions (30m × 18m × 8m) and an RT60 target of 1.5s per ISO 3382-1:2009. Enter your actual dimensions, select materials, and verify compliance instantly.

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