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Resilient Bars

Are Resilient Bars an Effective Means of Reducing Noise Transmission?

Resilient bar systems help soundproof and reduce noise of a ceiling or wall. Resilient bars are commonplace in suspended timber floors, especially for change of use schemes. They can be an essential part of achieving compliance with Part E of the building regulations requirement for noise control of a partition. They are often used in connection with other sound insulating materials, such acoustic membrane plasterboard systems, and create an effective acoustic break between the bottom of existing joists and ceilings.

A resilient bar is a thin metal channel designed to substantially improve the sound insulation of plasterboard walls and ceilings. The channel effectively isolates the plasterboard from the studwork, eliminating direct contact and dissipating sound which would normally be transferred through the frame.

Resilient bars work by decoupling the new suspended ceiling from the joists, creating a gap. This gap decreases sound transmission propagated through it, as sound vibrations travel less freely in open space than from material to material. The new ceiling is in effect floating off the joists via a light weight steel channel. The sound is reduced as it travels through the flexible flange of the resilient bars as seen below.

 

 

 

 

                Without Resilient Bars                                                  With Resilient Bars

The use of resilient bars significantly improves the acoustic performance of a wide array of projects from an impact and airborne perspective, they also provide a cost-effective solution. Furthermore, acoustic insulation (another low cost material) can be fitted between joists (as shown in pink in the image above), allowing for further attenuation of vibration and unwanted noise.

However, adopting a more complex solution also raises the issue of build quality and installation. Sound transmission is susceptible to flanking around structures, if they are not installed correctly. If resilient bars are not fitted to the joists properly, the effect of decoupling by the resilient bars will be compromised, however, with proper instruction the installation methodology of resilient bars is simple.

In conclusion, resilient bars provide a cost-effective means of reducing noise transmission through a ceiling or wall and they are simple to install. Air Tightness Solutions have a positive experience of partition systems that have incorporated resilient bars as being a highly effective way of reducing propagated noise transmission.

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