⛪ISO 3382-1:2009 · International

Worship Space Acoustic Design to ISO 3382-1:2009

Worship spaces present the highest acoustic design complexity because speech and music have fundamentally conflicting reverberation requirements. Speech intelligibility demands RT60 below 1.

TL;DR

Under ISO 3382-1:2009, a worship space of 2,000-4,000 m³ (typical dimensions 25m × 15m × 10m) requires an RT60 of 1–3s at 500-1000 Hz. A minimum STI of 0.45 is required for speech intelligibility. ISO 3382-1:2009 provides the measurement framework for worship space acoustics.

RT60 Target

1–3s

Noise Limit

N/A

STI Minimum

≥ 0.45

Frequency Range

500-1000 Hz

Specific Requirements

Parameter	Target	Clause Reference	Notes
Reverberation Time (RT60)	1.5–3s	—	500-1000 Hz, Informative, varies by denomination and volume
Frequency Range	500-1000 Hz	—	Octave bands for compliance assessment

Step-by-Step Compliance Calculation

1
Plan measurement campaign
Coordinate access with religious leadership. Plan measurements during scheduled closure or maintenance periods.
2
Measure ISO 3382-1 parameters
Record RT60, EDT, C80, D50, and STI at multiple source-receiver positions representative of worship activities.
3
Assess occupancy variation
If possible, measure at both empty and partially occupied conditions to quantify congregation absorption effect.
4
Report and recommend
Compare measured parameters to published benchmarks for the worship type. Identify areas for improvement.

Recommended Materials

Surface	Material Category	Min NRC	Coverage %
Selective surfaces	Targeted absorption	0.60	25%
Congregation seating	Upholstered or cushioned	0.50	80%

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

Common Failure Modes

⚠️Measurement in sacred spaces

Access restrictions, service schedules, and cultural sensitivities can limit measurement opportunities in worship spaces.

⚠️Variable congregation size

RT60 varies significantly between empty and full worship spaces due to the large absorption contribution of the congregation.

Frequently Asked Questions

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

ISO 3382-1:2009 requires a reverberation time of 1–3s at 500-1000 Hz for worship space spaces. ISO 3382-1:2009 provides the measurement framework for worship space acoustics. Parameters including RT60, EDT, C80, and STI are essential for characterising the acoustic quality of churches, mosques, synagogues, and temples. The standard enables objective comparison and benchmarking of sacred space acoustics.

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

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

A typical worship space (2,000-4,000 m³) requires absorptive ceiling tiles covering 70–85% 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 (25m × 12m × 10m) to calculate the exact absorption deficit for your room.

Calculate ISO 3382-1:2009 Compliance for Your Worship Space

Pre-loaded with typical worship space dimensions (25m × 12m × 10m) and an RT60 target of 1.8s per ISO 3382-1:2009. Enter your actual dimensions, select materials, and verify compliance instantly.

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