Custom Audio Designs Ltd 



Basic Soundproofing Help and Advice

Acoustically Uprating Domestic Masonry Walls

How your walls approximately rate:-
Normal speech can be heard easily -
Normal speech audible but unintelligible -
Loud speech can be understood -
Loud speech can be heard but unintelligible -
Loud speech can be heard faintly -
Shouting can barely be heard -
Shouting cannot be heard


To increase your wall performance we offer two primary solutions.

The first is to use our CAD M20 wall panels and two additional sheets of 12.5mm (or thicker) plasterboard. The M20 panels 'isolate' the additional plasterboard from physical contact with the existing wall and damp the vibrations before they are transferred to the outer plasterboard. The whole assembly glues together and only takes up 50mm of space from the wall. An average 4" brick wall gives around 39dB and even a 100mm cavity brick wall only gives around 47dB of performance. M20 with only 25mm of additional plasterboard has a figure of 48dB DnT,W+Ctr. M20 is also much more efficient than standard mineral wool backed plasterboard liner board.

The second, much better option, is to build an isolated studwall in front of, and not touching, the existing wall. This ideally involves incorporating acoustic mineral wool or even better Tecsound 2FT80 Acoustic Quilt in the cavity space, resilient bars to hang additional plasterboard to the studs and soundproofing mat sandwiched in-between the two sheets of plasterboard. The more isolation and damping that is applied to the studwork and materials the better the performance will be. Tecsound Acoustic Membrane can also be applied across the entire bare framework first for even better performance. The deeper the cavity space the better the performance especially at the lower bass frequencies.


Acoustically Uprating Domestic Plasterboard Partition Walls

To increase the performance of a stud partition, that already has a plasterboard face, you can use our CAD M20 panels with 25mm of additional plasterboard on top.

If you are happy to remove the plasterboard that's already there you can fill the cavity space with Acoustic Mineral Wool or even better Acoustic Quilt before adding Resilient Bars then two layers of plasterboard with soundproofing mat sandwiched in the middle of the plasterboard sheets. Again Tecsound Acoustic Membrane can also be applied across the entire bare framework first for even better performance.

Care must be taken to avoid direct contact between the additional plasterboard sheets and the existing structure (floor/ceiling/side walls).

If you are building a new stud partition it's essential to do everything you can to damp and isolate the structure. You should add 2 strips of soundproofing mat around the periphery of the frame to help isolate the frame from the surrounding structure. You should mastic seal the frame airtight (around the edges) before adding the additional materials. Plasterboard should ideally be screwed to the studs rather than nailed.

If you are really limited to room space the most basic thing you can do is to add a strip of soundproofing mat to the front faces of the studwork which will help isolate the plasterboard from the face of the studs. You should then add 2 layers of 12.5mm plasterboard with a layer of soundproofing mat sandwiched inbetween. This will bring the wall face out only 30mm. You should still make sure that the additional plasterboard does NOT touch the surrounding structure, this small gap should be sealed with flexible mastic sealant.


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All information contained in these details is given in good faith but without warranty.
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