7 ways to improve architectural acoustics

Improving sound quality and architectural acoustics can have a positive impact on employee productivity in workplaces and increase the quality of life in residential buildings. Therefore, acoustic design is no longer a luxury reserved for high-end projects. This is a necessity that has a huge impact on projects of all sizes and types.

Acoustic control should be considered early in the project planning and design process. The acoustics desired for a space will determine what building materials should be used and where. Specifically, when designing a project that requires a quieter and acoustically more pleasant ambience, sound insulation will play a crucial role.

Read on to learn more about common acoustical challenges architects face, followed by seven strategic ways to use insulation to control sound.
 

Common challenges in architectural acoustics

Sound is a movement of energy. It is created when objects vibrate, touch each other, and cause the air around them to vibrate to produce the audible noises that the human ear will eventually be able to hear. In architectural acoustics, knowing how to direct or slow down this movement of energy to harmonize it with the purpose of a space is an essential task.
 
To complicate matters, the characteristics of a room influence how sound vibrations travel through space and affect the people who use it. Since there are so many variables that can affect the way sound travels in a space, there are many challenges to consider and address when designing a project.
 

Open concept spaces

More and more companies are turning to open concept spaces to foster collaboration and team unity. Unfortunately, in these open spaces, there is nothing to block or absorb airborne noise. Therefore, the impact of talking employees, phone conversations, and hallway traffic can create a disruptive environment if not managed properly.
 

Ambient noise

It is important not to underestimate the effect of ambient noise on the acoustics of a building. Elements such as vehicular traffic, foot traffic and other noises outside the building can also affect the noise level and acoustic quality of a building.
 

Adjacent rooms poorly insulated

When planning sound insulation, it is important to consider the sound profile of adjacent rooms. Think of an example of a conference room placed next to a break room. Maximum confidentiality of the conference room should be ensured and additional measures taken to prevent outside noise from being transmitted into the room.
 

Location of mechanical equipment

Mechanical equipment such as heating, ventilation and air conditioning systems are essential for the overall comfort of the office environment. Unfortunately, these devices can transmit noise throughout the building. Equipment location, mounting, and duct insertion loss should be considered when analyzing the selected system.
 

How to improve architectural acoustics with insulation

The use of absorbent or acoustic insulation is only one of many techniques to improve acoustics in a building. Additional techniques include sound masking and sound isolation. Many of these techniques are effective as stand-alone solutions, but for best results, consider using more than one of the following suggestions.
 

1.    Noise control in wall partitions

Wall partitions separate spaces in a building. The most common way to improve noise control in wall partitions is to add mass and insulation. The additional ground and insulation each add resistance to sound waves. Options for increasing mass include adding additional layers of drywall during assembly. In addition to adding mass, it is important to fill the empty wall space with sound absorbing insulation such as fiberglass or mineral wool. To minimize sound transmission, ground and insulation are required. The isolation of the bulkhead components by the use of profiles and elastic furring is also effective in reducing "acoustic short circuits".
 

2.    Sound absorption insulation for suspended ceiling systems

Sound enhancements can be made to ceiling systems by adding ceiling panels made of composite materials typically composed of mineral fibers or glass fibers. The noise reduction coefficient performance indices for molded mineral fiber boards range from 0.65 to 0.95. The noise reduction coefficient indices for dry felt fiberglass panels range from 0.95 to 1.0.
 

3.    Reduced sound transmission thanks to the mat insulation

Sound can bend and move around objects or “leak” into small spaces. Hand-laid fiberglass insulation (and sealants if applicable) can significantly reduce unwanted sound transmission passing through these voids. Filling in empty spaces can also help improve the sound transmission index.
 

4.    Absorb reflected sounds using sound insulation

Walls, ceilings, floors and furniture can reflect airborne sound like voices and music; they can also transmit impact sounds such as footsteps on the floor. Unwanted sound reverberation occurs when air vibrations strike an acoustically reflective surface in another medium, such as a wall, ceiling, or floor causing sound to return to the room.

 

Sound insulation helps absorb sound rather than making it reflect back into the room. Part of the absorbed sound is converted into heat and part of it is absorbed into the insulation

 

5.    Acoustic insulation panels

An easy and less invasive technique for controlling sound is to use acoustic panels in the finished space. The panels are made of fiberglass or other absorbent material covered with fabric. The panels are then attached to walls or ceilings or hung to help control the sound. In general, the greater the number of square feet of absorbent material exposed in the space, the less reverberation of sounds is reduced.

 

An example is a gymnasium with hard surfaces. Hard surfaces cause reverberation even after the source stops producing sound. Too much reverb results in an echo. Adding panels to a gymnasium can help prevent reverberation by diffusing sound.

6.    Reduce the noise of the heating, ventilation and air conditioning system using sound insulation panel

Noise pollution comes from a variety of places, but heating, ventilation and air conditioning systems are a common cause. Whether it is the transmission noise of the conduit (insertion loss) or the mechanical equipment itself, the resulting sound and vibration can disrupt office and home environments. Duct systems and open plenums

very often constitute a source of transmission of unwanted noise from one space to another.

 

The design and installation of black acoustical ceiling and wall coverings and fiberglass acoustical panels are very effective means of reducing noise in buildings with finished, structurally exposed spaces and in plenums. It can be detailed so as not to detract from the architectural design and can be incorporated in most conditions while being visible. It is also one of the cheapest.
 

7.    Use concave or convex insulation to improve acoustics 

The shape of a room and its corresponding insulation can greatly affect the way sound travels. Concave shapes tend to bring sound to a focal point, while convex shapes diffuse sound in several directions. Depending on the needs of a particular space, these shapes may or may not be beneficial.
 

Final thoughts

Sound insulation can greatly improve the sound quality in a building. Insulation combined with sound insulation and masking techniques can minimize unwanted noise and create a more pleasant environment.