🏫NCC 2022 / AS/NZS 2107:2016 · Australia / New Zealand

Classroom Acoustic Design to NCC 2022 / AS/NZS 2107:2016

Classrooms are the most acoustically critical room type in education buildings, where speech intelligibility directly determines learning outcomes. A well-designed classroom achieves an unoccupied RT60 of 0.

TL;DR

Under NCC 2022 / AS/NZS 2107:2016, a classroom of 150-300 m³ (typical dimensions 10m × 7m × 3m) requires an RT60 of ≤ 0.6s at 500-2000 Hz. Background noise must not exceed 40 dBA. NCC 2022 Section F5 references AS/NZS 2107:2016 for recommended internal noise levels and reverberation times.

RT60 Target

≤ 0.6s

Noise Limit

40 dBA

STI Minimum

N/A

Frequency Range

500-2000 Hz

Specific Requirements

Parameter	Target	Clause Reference	Notes
Reverberation Time (RT60)	≤ 0.5s	AS 2107 Table 1	500-2000 Hz, Furnished, unoccupied, primary school per AS 2107
Background Noise Limit	≤ 35 LAeq	AS 2107 Table 1	HVAC + building services, unoccupied
Frequency Range	500-2000 Hz	—	Octave bands for compliance assessment

Step-by-Step Compliance Calculation

1
Identify NCC classification
Confirm the school is Class 9b under NCC 2022 and that Section F5 acoustic provisions apply.
2
Apply AS/NZS 2107 targets
Use AS/NZS 2107 Table 1 to determine the recommended RT60 and internal noise level for classroom spaces.
3
Design acoustic treatment
Specify ceiling and wall treatments to achieve RT60 <= 0.6s using Sabine calculation methodology.
4
Assess noise ingress
Model external and HVAC noise contribution to verify compliance with 35-40 dBA background noise limit.
5
Commission and certify
Engage an acoustic consultant to verify compliance post-construction as required by the NCC performance solution pathway.

Recommended Materials

Surface	Material Category	Min NRC	Coverage %
Ceiling	Mineral wool ceiling tile	0.85	80%
Rear wall	Fabric-wrapped panel	0.80	40%
Floor	Carpet tile	0.25	100%

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

Common Failure Modes

⚠️Thermal mass vs acoustics conflict

Australian schools using exposed concrete for passive cooling conflict with absorption requirements for RT60 compliance.

⚠️External noise from traffic or aircraft

Schools near arterial roads or airports struggle to meet background noise limits even with closed windows.

Frequently Asked Questions

What RT60 does NCC 2022 / AS/NZS 2107:2016 require for a classroom?

NCC 2022 / AS/NZS 2107:2016 requires a reverberation time of ≤0.6s at 500-2000 Hz for classroom spaces. NCC 2022 Section F5 references AS/NZS 2107:2016 for recommended internal noise levels and reverberation times. Classrooms should achieve RT60 <= 0.6s with background noise of 35-40 dBA. This is mandatory for Class 9b buildings in Australia.

What is the maximum background noise level for a classroom under NCC 2022 / AS/NZS 2107:2016?

NCC 2022 / AS/NZS 2107:2016 sets a maximum background noise level of 40 dBA for classroom 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 classroom need to comply with NCC 2022 / AS/NZS 2107:2016?

A typical classroom (150-300 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 (9m × 7m × 3m) to calculate the exact absorption deficit for your room.

Calculate NCC 2022 / AS/NZS 2107:2016 Compliance for Your Classroom

Pre-loaded with typical classroom dimensions (9m × 7m × 3m) and an RT60 target of 0.6s per NCC 2022 / AS/NZS 2107:2016. Enter your actual dimensions, select materials, and verify compliance instantly.

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