How to Make An Acoustic Suspended Ceiling
makes a suspended ceiling an acoustic suspended ceiling? What does an acoustic
ceiling do? And is an acoustic suspended ceiling the same as a soundproof
suspended ceiling? In this guide, we’ll explain.
Why do acoustics matter?
If you’re designing a cinema, concert hall or recording studio, the acoustics are obviously going to matter – they’re a major part of the reason the building exists. But acoustics matter in everyday buildings too:
- The more sound is allowed to bounce around a room the more echo it creates. That can make a space feel cold and uncomfortable. For many people, it can also make it hard to concentrate and pick one sound source out from any other. That can be an issue in a wide range of spaces, from offices to classrooms to gyms.
- The more sound can escape from a room the harder it is to create private spaces, and the more disruptive sound elsewhere in a building can be. That can be a particular issue in offices and in healthcare and academic settings.
What are sound attenuation and sound absorption?
Sound absorption describes a surface’s ability to absorb the sound within a room and prevent it bouncing around. The better the sound absorption, the more comfortable a space will be and the easier it will be to concentrate when you’re in it.
Sound attenuation describes a surface’s ability to prevent sound escaping from a room. The better the sound attenuation capabilities of a meeting room, for example, the less risk there’ll be of someone outside the room overhearing what’s happening inside.
Can a suspended ceiling support sound absorption or sound insulation?
Yes. Most suspended ceilings will reduce echo and improve privacy within a room but some do the job better than others. Where ceiling tiles are manufactured from materials specifically designed to absorb sound or insulate a room to prevent sound escaping, they are known as acoustic ceiling tiles. The suspended ceilings they help create are known as acoustic suspended ceilings.
Is an acoustic suspended ceiling a soundproof ceiling?
It can be, although generally the level of acoustic performance most businesses need is not total soundproofing, which can be costly and impractical to achieve. It’s also worth noting that even the most soundproof ceiling won’t create a soundproof room unless you take the same rigorous approach to the walls and doors.
A high level of sound insulation and sound absorption, however, can make a room as effectively soundproof as most organisations need.
How to install and acoustic suspended ceiling
Installation-wise, there’s no difference between a regular and acoustic suspended ceiling. What differs is the materials you’ll use. Of greatest importance will be the ceiling tiles you choose which should be designed to deliver good or excellent levels of sound absorption and insulation.
What does ‘good’ attenuation and absorption sound like?
Not every ceiling tile manufacturer measures the insulation and absorption properties of their tiles in quite the same way, but the two most common measures are:
Aplha W (AW): This is a ‘weighted sound absorption coefficient’ which combines a range of sound absorption values into a single value for simplicity. The Alpha W coefficient ranges from 0 (no absorption) to 1 (total absorption).
What does that mean when applied to an acoustic suspended ceiling? Take these three examples:
- The Armstrong Zentia Bioguard is designed primarily for medical environments where bacterial control rather than acoustics are the main concern. For that reason, its Alpha W is 0.2.
- This Armstrong Zentia Ceramaguard has been designed as a high performing all-round ceiling tile. Its Alpha W is 0.6, towards the upper end of what might be considered ‘good’ absorption in general purpose spaces.
- This Armstrong Perla has an excellent Alpha W of 0.95 making it the natural choice for quiet environments like libraries.
Some of our tiles use the NRC (noise reduction coefficient) which also gives a figure between 0 and 1. Although calculated differently than Alpha W, the practical difference in terms of general performance is small. Where the performance of your acoustic ceiling is critical, however, talk to us.
Decibels (dB): Sound attenuation is measured according to the reduction in sound escaping from a room into adjoining areas or void spaces above the ceiling. As with sound absorption, the sound insulation of a room relies on more than the ceiling, but as a general rule of thumb, and assuming the rest of the room matches the sound insulating properties of the ceiling, a sound reduction of just 20db will mean regular speech is audible.
A sound reduction of 55dB, on the other hand, will mean even shouting will be inaudible. For a ‘good’ rating (meaning that loud speech is audible but not easy to make out), look for a sound attenuation (or Dnfw/Dncw) figure of at least 35dB or greater.
What else does an acoustic suspended ceiling need?
Acoustic ceiling tiles will, depending on the individual tile’s performance, help absorb sound within a room or prevent it escaping to other areas, but the tiles aren’t the only factor that can contribute to a ceiling’s acoustic performance.
To create an acoustic or soundproof suspended ceiling, you’ll also need the following:
Acoustic hangers: A traditional suspended ceiling is suspended from wires. Sound travels by waves and it’s easy for the soundwaves to travel along the wires in either direction. This means that using traditional suspended ceiling fixings could result in noise escaping your room along the wires or entering your room from the hard floor above.
Acoustic hangers replace some of the metal components with rubber, plastic or elastic. This breaks the path of vibration, preventing the soundwaves from using the hangers as a conduit. If you’re installing acoustic ceiling tiles, acoustic ceiling hangers are the obvious choice.
Soundblocker: What happens if you need a particular type of ceiling tile—perhaps one that offers high antimicrobial properties—but that tile offers limited acoustic performance? Soundblocker inserts provide the solution.
Designed to sit above the ceiling tile, they ensure your suspended ceiling can still deliver impressive sound attenuation performance even where the ceiling tiles don’t. Adding up to 53dB of sound reduction, they’ll be enough to ensure even the loudest, shoutiest conversation won’t transmit through your ceiling.
Create a better acoustic suspended ceiling with JCS
You’ll find a vast range of ceiling tiles - plus all the soundblockers and acoustic hangers you’ll ever need to create an acoustic or soundproof ceiling – for less at JCS. For help selecting the right products for your suspended ceiling, talk to us.