Wall System

Q140

Dual-Cavity Acoustic Wall System

STC 41OITC 30Rw 41 dB ±5 dB70–90 mm

The Q140 Dual-Cavity Acoustic Wall System is a free-standing acoustic partition for situations where there is no solid base wall to line. Deep Main 112MS and Sub 114SS cassette keels frame a wide dual cavity around a central partition board, giving two independent air gaps that break the airborne transmission path.

Filled with mineral / synthetic wool and finished with composite insulation board and plasterboard, the Q140 delivers STC 41 / Rw 41 dB as a complete stand-alone wall — suitable for new room divisions and back-of-house separation.

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Exploded Mounting Structure

9 layers · top to bottom

Layer Build-up

1
Concrete Wall
2
Min. 80 kg/m³ Mineral / Synthetic Wool
600 × 1200 × 50 mm
3
Partition Board
4
Main Cassette Keel 112MS
Cassette Keel →
5
Sub Cassette Keel 114SS
Cassette Keel →
6
SG-DM452 Vibration Damping Tape
45 × 6000 × 2 mm
SG-DM452 →
7
Composite Sound Insulation Board
1220 × 1220 × 17–18 mm
SG-E17 SG-C10 SG-CN10 SG-F8
8
Plaster Board
9
AcousPanel or Other Finishes
AcousPanel →

Layer Specifications

Q140 layer specifications
Layer	Product	Specification	Application
Damper	Built-in Shock Damper	20 × 20 × 10 mm	Break sound bridges
Absorption	Mineral Wool / Synthetic Wool	600 × 1200 × 50 mm	Uses sound absorption to enhance insulation
Structure	Cassette Keel	Main: 112 mm \| Sub: 114 mm	Secure fit with preserved acoustic decoupling
Damper	Vibration Damping Tape	45 × 6000 × 2 mm	Minimized rigid connections
Insulation	Composite Sound Insulation Board	1220 × 1220 × 17–18 mm	Greatly improves sound insulation performance

System Description

Panel 1

1 × 100 mm Concrete

Frame

Rubber isolation clip on metal stud (37 mm × 26 mm), spacing 600 mm, cavity width 150 mm + 50 mm Mineral Wool (80 kg/m³)

Panel 2

1 × 8 mm Fibre Cement + 1 × 1.3 mm Rubber + 1 × 6 mm Plasterboard

Details

Panel size 2.4 m × 2.4 m · Partition surface mass 24.5 kg/m² · Mass-air-mass resonant frequency 138 Hz

Acoustic Performance

STC 41OITC 30Rw 41 dB ±5 dB70–90 mm

Sound Insulation Prediction

Simulated with

Q140 sound insulation prediction chart — STC 41, OITC 30, Rw 41 dB

All STC, OITC and acoustic performance figures are estimated / simulated values (INSUL Sound Insulation Prediction v9.0.22, © Marshall Day Acoustics 2017) intended solely as design references — not guaranteed field performance. Final results depend on site conditions, construction details and installation quality, beyond the control of INSUL.