The Additional Costs of Using Resilient Channel
Acoustics are an important consideration in construction to make sure that the impact of airborne noise and impact noise is minimised in transfer between spaces. A common usage would be in multiple dwellings such as housing conversions and large apartment blocks – where sound transfer can be most problematic, and the requirement of Part E Building Regulations determines whether a property can be rented.
Resilient Channels (RC) are very common in the construction industry to improve acoustic performance in soundproofing walls and soundproofing ceilings by creating separation and suspending the mass away from the structure. They are usually chosen for their relatively cheap market price per m2 and promise of an increased performance in both airborne and impact.
To make you aware of the potential issues and additional costs RC can leave within the project, we have provided some brief points to review before proceeding with this method.
Whether you are soundproofing your home, a recording studio, an office or even an events space, iKoustic want to make sure the project is right every time by we specifying and supply the GenieClip System, which we will give more detail on later under 'What Is My Alternative'.
Using the Resilient Channel and its inherent issues with installation
When fixing RC, there are common issues which take place that can compromise performance overall
- When fixing the screws into the plasterboard, it is very easy to fix through the RC and into a stud or into the brick and block work, leaving a direct path of sound to travel through the screw and compromising the overall performance.
- If the RC is extended too far and has contact with the adjacent surfaces, this will cause the wall or ceiling to be short circuited, leaving a direct path of contact for the sound to travel back through - compromising performance.
- If the RC is installed the incorrect way up, the weight of the Acoustic Plasterboard and any other attachments will cause the wall to push closer to the stud work rather than further away, leaving the wall short circuited.
- Exceeding the weights of RC by adding too much product to the bar will cause the wall to sag, leaving the mass in hard contact with the flooring resulting in a poor performance.
- If the screws are over tightened into the wall, this can pull the RC in, causing it to bend and warp. This would then need to be removed, along with the RC and replaced (also now leaving a potentially damaged plasterboard)
What would these incorrect fixings cost me?
When investigating previous projects which appear to be failing Building Regulations or unexpected poor results, we have found Resilient Channels fixed in the above methods lead to very poor performance.
With the incorrections above, this could leave a large performance dip of around 10dB in some cases and remember – 10dB is a 50% loss in performance of perceived loudness (so with 10dB reduction you would perceive this as being halved)
If the wall is left to sag overtime, this could pass Part E Building Regulations as a starter and over time decrease in performance by making hard contact with the flooring, leading to costly remedial works being passed over to the contractor who carried out the work.
Additional reading for Guidance on Passing the Sound Test
We have created a blog post that gives guidance on passing the sound test - click on our icon below!
What is my alternative?
Our GenieClip System has performed above Part E Building Regulations time and time again.
The engineering and design of the GenieClip and Furring Channel (FC) has led to a full proof acoustic system which is near on impossible to fix incorrectly for the following reasons;
- With a simple spacing configuration, you only require one screw per GenieClip, this can be fitted direct to brick and block work, metal frame work and timber stud work
- The Furring Channel easily clips into the GenieClip, this means that there is an increased suspension from the rubber mounting within the clip
- Materials are fitted then on to the FC which then all your self-tapping screws will sit within the cavity
- When fastening Acoustic Plasterboard, it would not be possible to overtighten because of the above point, it would not meet anything – nor would the Furring Channel buckle.
GenieClip System also provides an increased performance in low frequencies compared to the Resilient Channel.
GenieClip Performance on Impact Noise
With Ln,w you are looking for a lower number, as you can see on the graph below - both single and double layer plasterboard are performing greater than the Resilient Channel.
- 4-6dB increase depending on the final layers
GenieClip Performance on Airborne Noise
With Rw you are looking for a higher number, as the graph shows below - we can see an increased performance across the board with the GenieClip System over the Resilient Channel
- 6dB increase over resilient channel
How is it installed?