Soundproofing walls and floors

This week, we provide a guide outlining ROCKWOOL products that can be used with the advice given in Building Regulations, for remedial works to a typical separating wall and floor scenario.

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Soundproofing Separating Walls

Using a combination of isolation, absorption and mass, a plastered 100mm blockwork wall can be upgraded to meet the Building Regulations. Here, we talk you through the process, using ROCKWOOL products.

• Isolation - an independent timber or stud frame should be constructed at least 10mm away from the existing wall. This clear cavity means that there is no structural path for sound to transfer directly through the wall from one side to the other.

• Absorption - the frame should be filled with 50mm ROCKWOOL Flexi® or ROCKWOOL Sound Slab. As sound tries to pass through the air trapped within the wool structure of ROCKWOOL, it gets absorbed by friction, as the individual fibres are made to move back and forth. In addition, the random orientation of these fibres makes it very difficult for sound to find a path from one side to the other.

• Mass - the frame should then be faced with two layers of 15mm standard plasterboard. The greater the mass of the wall, the more difficult it is for sound to pass through.

Learn more about ROCKWOOL products for Separating Walls here


Soundproofing Separating Floors

Separating timber floors need to be treated to reduce the transfer of airborne noise (speech, televisions, music), as well as structure-borne noise from impacts and vibration (footfalls, washing machines). As with separating walls, this is achieved through isolation, absorption and mass.

• Isolation - a floating floor should be created with 18mm chipboard spot-bonded to 15mm acoustic plasterboard, which is laid on ROCKWOOL Rockfloor 25mm, on 15mm OSB.

• Absorption - ROCKWOOL Sound Slab 100mm should be laid between the joists.

• Mass - the mass of the ceiling should be upgraded to at least 20 kg/m2, e.g. two layers of 15mm standard plasterboard.

Learn more about ROCKWOOL products for separating floors here

Next week, we will conclude our four part series on flat conversions.