Acoustic Treatment

Acoustic Treatment

Standard Acoustical Treatments :-

Wall treatment –

1) Gypsum based
Existing walls would be acoustically treated using gypsum based acoustical treatment The treatment shall consist of12.5mm thick gypsum acoustical aperture boards and GI framework as per IGL’s specifications with glasswool / Rockwool or equivalent as insulation material.

2) Fabric based
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.

3) Perforated Hardboard based:
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 the panels of size 2ft x4ftand for low frequency/ Non resonating acoustical treatment, plywood is used as surface material for the panels of size 2ft x 3ft.

Comparative note of various acoustic treatments.

S.N.

Specification

Gypsum

Fabric

Perforated hard board

1

Economy

Moderate

Very Cheap

Expensive

2

Durability

Good

Good

Excellent

3

Repairs & Replacement

Easy: Need not depend on main supplier. Locally can be repaired

Difficult: Have to depend totally on main supplier

Moderate

4

Painting

Easy: Can be repainted in any colour.

No choice once installed. Fabric fades. Repainting impossible

Can be repainted in any colour.

5

Aesthetic

Excellent

Moderate

Moderate

6

Acoustics

Multiple frequency room

Usually single frequency room

Multiple frequency room with frequency balancing.

7

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.

8

Thermal Conductivity

Very low
Low electricity bill

High

Moderate

9

Dimensional stability

Exceptionally stable

Not Stable, Develops sag.

Stable. High Acoustical integrity

10

Termite & Rodent

Absolutely free

Partial attack on fabric and doors

Need regular anti-termite treatment

11

Light reflectance

Excellent

Not good

Excellent

Pros And Cons of Various Acoustic Treatments :-

Fabric based treatment

Pros:
1. This is very inexpensive treatment and having less installation period as painting is no necessary.
2. The panels are made in plywood and now a days in steel sheets also.

Cons:
1. As this treatment retains water, wrinkles are formed.
2. Develops sag over period of time due to natural reaction to environmental changes.
3. Fabric has tendency to shrink as it is not resilient.
4. Various frequency absorbing panels are not possible hence room treated using this treatment is single frequency rooms.
5. Fabric usually fades and have to rely on supplier for repairs. Also colour won’t match after repairs.
6. As fabric is attached to panel either by nails or by rivets, it starts tearing from holes.
7. GI sheet used to wrap fabric starts reacting with the rust at the place where rivet is formed.

Gypsum based treatment

Pros:
1. Mainly easy installation and any labour can repair.
2. Customer need not depend on supplier for his price and time.
3.  Repainting, refurbishing can make installation appear very new room at very meagre cost.
4. Any huge room corner can be converted to room of desired size.

Cons:
1. comparatively brittle to heavy impact.

Perforated Hard Board based treatment

Pros:
1. Technically very correct room as acoustic aperture is suitable.
2. The panels like low frequency panel, high frequency panel and non resonating panels can be formed.
3. High performance multiple frequency panels create frequency balanced room.
4. The perforated hard board will not split or crack and very resilent.
5. Impeccable acoustic integrity and long life.

Cons:
1. The boards are not easily available.
2. Construction is difficult and hence installation takes more time.
3. Expensive treatment.
4. Anti-termite is essential.

Other Acoustical treatments:

Ceiling treatment

The ceiling treatment would consist of galvanized iron channels and high sound absorption treatment would be provided using acoustic ceiling tiles. The special suspension would be provided to suppress the structure born noise to offer good CTC.

Sound treated Door

Door of desired size would be created using multiple layers of mediums created using fiber material, Plywood, Air gaps, etc. The closing mechanism consists of heavy-duty door closer and compression material having more than 30% compression ratio is provided across the closing edge of the door. A supporting flush door will be provided to create a micro sound lock.

Acoustically treated window

The breathing window consists of two glass panes (bubble free) of variable thicknesses fixed using plywood and compression material having minimum of 30% compression ratio and moisture-absorbing chemicals provided to restore good viewfor long time.