T90Double
Dual Acoustic Ceiling Damper System
The T90Double Dual Acoustic Ceiling Damper System pairs the cassette-keel frame with a double-skin finish — a composite insulation board plus a twin plasterboard-and-rubber panel bonded through an SG-DM612A Vibration Damping Pad. The added mass and constrained-layer damping give exceptionally steep high-frequency roll-off, with sound reduction climbing beyond 70 dB in the upper octaves.
While its weighted rating is STC 44 / Rw 44 dB, the dual-panel construction delivers the strongest treble isolation of the lightweight ceiling range, making it well-suited to music and home-theatre rooms where high-frequency containment matters most.
Exploded Mounting Structure
11 layers · top to bottom
Layer Build-up
- 1
Concrete Slab
- 2
Min. 80 kg/m³ Mineral / Synthetic Wool
600 × 1200 × 50 mm
- 3
M8 × 80 Expansion Bolt
- 4
Edge Cassette Keel 20EB
- 5
Main Cassette Keel 37MB
- 6
Sub Cassette Keel 50SB
- 7
Composite Sound Insulation Board
1220 × 1220 × 17–18 mm
- 8
SG-DM452 Vibration Damping Tape
45 × 6000 × 2 mm
- 9
SG-DM612A Vibration Damping Pad
610 × 610 × 2 mm
- 10
Plaster Board
- 11
AcousPanel or Other Finishes
Layer Specifications
| Layer | Product | Specification | Application |
|---|---|---|---|
| Damper | Vibration Damping Tape | 45 × 6000 × 2 mm | Minimized rigid connections |
| 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: 28 mm | Sub: 50 mm | Secure fit with preserved acoustic decoupling |
| Damper | Vibration Damping Pad | 610 × 610 × 2 mm | Break sound bridges |
| 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 + 1 × 2 mm Rubber + 1 × 9 mm Plaster Board
Details
Panel size 2.4 m × 2.4 m · Partition surface mass 30.2 kg/m² · Mass-air-mass resonant frequency 337 Hz
Acoustic Performance
Sound Insulation Prediction
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.
Products Used in This System
Specify the T90Double System
For Your Project
Our technical team can adapt this system to your site conditions and provide a full installation specification and quotation.
