Comprehensive guide to acoustic treatments and their specifications
Existing walls would be acoustically treated using gypsum based acoustical treatment. The treatment consists of 12.5mm thick gypsum acoustical aperture boards and GI framework as per IGL's specifications with glasswool/Rockwool or equivalent as insulation material.
Existing walls would be acoustically treated using fabric based acoustical treatment. The panel shall be formed with highest quality RB slabs of Rockwool/glasswool or equivalent, stretched acoustic fabric for acoustical aperture, Hardboards, Hardware, etc as demanded by design.
Existing walls would be acoustically treated using panel based acoustical treatment. The panel shall be formed with highest quality RB slabs of Rockwool/glasswool or equivalent, PHB for acoustical aperture, Plywood, Hardboards, Hardware, etc as demanded by design.
For high frequency acoustical treatment, perforated hard boards are used as surface material providing acoustic aperture for panels of size 2ft x 4ft. For low frequency/Non resonating acoustical treatment, plywood is used as surface material for panels of size 2ft x 3ft.
| Specification | Gypsum | Fabric | Perforated Hardboard |
|---|---|---|---|
| Economy | Moderate | Very Cheap | Expensive |
| Durability | Good | Good | Excellent |
| Repairs & Replacement | Easy: Need not depend on main supplier. Locally can be repaired | Difficult: Have to depend totally on main supplier | Moderate |
| Painting | Easy: Can be repainted in any colour. | No choice once installed. Fabric fades. Repainting impossible | Can be repainted in any colour. |
| Aesthetic | Excellent | Moderate | Moderate |
| Acoustics | Multiple frequency room | Usually single frequency room | Multiple frequency room with frequency balancing. |
| Acoustical stability | Excellent: Multiple frequency absorbers can be made | Not very stable. Only single band absorbers. Not very good | Excellent: Any absorption can be achieved. |
| Thermal Conductivity | Very low Low electricity bill | High | Moderate |
| Dimensional stability | Exceptionally stable | Not Stable, Develops sag. | Stable. High Acoustical integrity |
| Termite & Rodent | Absolutely free | Partial attack on fabric and doors | Need regular anti-termite treatment |
| Light reflectance | Excellent | Not good | Excellent |
The ceiling treatment consists of galvanized iron channels with high sound absorption treatment provided using acoustic ceiling tiles. Special suspension is provided to suppress structure-borne noise and offer good CTC (Ceiling to Ceiling) performance.
Doors of desired size are created using multiple layers of mediums including fiber material, Plywood, and Air gaps. The closing mechanism consists of heavy-duty door closer and compression material with more than 30% compression ratio provided across the closing edge. A supporting flush door provides a micro sound lock.
The breathing window consists of two bubble-free glass panes of variable thicknesses fixed using plywood and compression material with minimum 30% compression ratio. Moisture-absorbing chemicals are provided to maintain good view for extended periods.