Weighted Sound Reduction Index Explained
When it comes to designing a soundproof space, there are a few measurements to keep in mind, such as the Weighted Sound Reduction Index.
In this blog, we explain what it is and how it’s used.
What is the weighted sound reduction index?
The Weighted Sound Reduction Index (Rw) is a rating to measure and convey how effective a soundproofing material or system is. This rating is expressed in decibels (dB).
As you can see in the table below, the higher the Rw rating, the better the sound insulation.
For example, according to the figure, at 30 Rw some speech will be intelligible, but at 48 Rw loud speech will be audible but unable to be deciphered.
What is Rw + Ctr?
When designing a space and considering its acoustics, you may also see the rating Rw + Ctr.
The Ctr is an adjustment factor for low-frequency noise, because in some cases the Rw rating does not account for all noises (think low-frequency bass noise generated from home theatre or sound systems.)
The low-frequency sound correction factor (Ctr) is always a negative number, which means the Rw value will always be greater than the Rw + Ctr figure.
The Rw + Ctr performance figure is determined by the material properties used and includes factors such as weight, stiffness, thickness and type of cavity insulation.
What Acoustic Rating Should I Look for When Trying to Reduce Sound?
So, if you’re looking for a wall system that is effective at reducing sound transmission, you’re looking for a high Rw rating and a high Rw + Ctr rating.
And just remember that some buildings require a minimum Rw + Ctr value be achieved.
Bris Aluminium Products and Achieving Desired Rw
When you’re picking the Bris Aluminium partitions for your project and you want to reach a certain level of sound insulation, remember it’s the combination of materials that give you acoustic performance and soundproofing.
So always consider the range of other materials you need to get your desired rating, such as plasterboard, soundproofing glues and seals.
Do you have questions about our products and acoustic ratings? We’re more than happy to take your call and answer your queries, so please get in touch on 1300 274 407.
Bris Aluminium is a locally owned and operated company which supplies Australia’s best aluminium partitions, door frames and windows. You can easily shop our product range online.
Our high-quality products are affordable, great value for money and customisable. We can help with superior office fit outs for a variety of businesses and can assist with a range of residential space saving solutions as well. To make things easier, detailed design drawings are also available online for every product we stock.
Bris Aluminium’s quality assured certified products have a high level of adaptability and meet Australian standards including access requirements relating to disabilities.