Airborne and Impact Noise Question and Answer

Question

I live in a Victorian flat 1868 on the floor.. The people on the ground floor have lovely cornices.+ lathe and plaster ceiling.    As I am having rewiring,  we would both like to put in sound insulation. I especially want to reduce airborne noise but also impact.  I have a timber floor.  Joists 8″ with 14″ between joists.   We cannot hear normal conversation between the floors, but we can hear loud radio (around 70dB and loud walking.  Kitchen and bathrooms (32m2 ) will have lino and the rest (100m2) will have carpets. I have been offered mineral wool in the joists, Acoustilay, Screed 28 and Quattor 45. I would be most grateful if you could please advise.  Many thanks for your help.

Answer

Thank you for your enquiry.  It sounds as though whoever advised the acoustic solution is talking along the correct lines by installing a sound absorbing mineral wool between the joists with a floating floor on top of the existing floor and on top of this a heavy, acoustic underlay on which a carpet should be fitted for best results.  However, I cannot see where the Quattro 45 would be used because this is a sound absorbing plasterboard and is usually applied to ceilings and clearly, this would not normally be wanted on a ceiling with decorative cornices.  The only reason I can think of why this is being suggested is because lathe and plaster ceilings become unstable after a time, so it might be considered prudent to screw on an additional layer of plasterboard, working around the cornices to stabilise the ceiling.  If this is the case the plasterboard would have to be screwed through to the supporting joists and the screw heads filled to hide them before decorating.

With regard to the rest of the acoustic treatment, I can find no fault except there may not be enough mass being added to give effective sound blocking performance against airborne noise.

Normally, a maximum of 100mm of AMW100 acoustic mineral wool should be installed as a loose fit between the joists with the original floorboards (if required) screwed back down.  To add more mass I suggest our system will be more effective and is as follows.

1.  Overlay floorboards with 2mm thick SBM5, a 5kg per square metre soundproofing mat.

2.  On top of this lay 10mm thick R10, a recycled rubber resilient layer to absorb impact noise.

3.  A floating floor of 18mm QuietBoard, a high density (25kg per sq. mtr.) tongued and grooved acoustic flooring

4.  The Acoustic Underlay would be our 15mm thick QuietFloor with a mass of 15kg per sq. mtr.

Carpet can be installed directly on top of the QuietFloor without the need for additional underlay.

This system will be adding 45kg per sq. mtr. of mass to the floor surface that is essential to help control airborne noise and the fact it incorporates a decoupled floor, reduction ofimpact noise will also be catered for.

More information on the products of ours mentioned above can be viewed on our web site via the following links

AMW100                    –           http://www.soundservice.co.uk/acoustic_mineral_wool_AMW.html

SBM5                         –           http://www.soundservice.co.uk/soundproofing_mat_SBM5.html

R10                             –           http://www.soundservice.co.uk/R10_index.htm

QuietBoard                –           http://www.soundservice.co.uk/QuietBoard.htm

QuietFloor Plus        –           http://www.soundservice.co.uk/quietfloor_plus.html

In the kitchen and bathroom, I would suggest the floor covering to be a Cushionfloor type Vinyl on top of moisture resistant ply which in turn is on top of 5mm Linoroll recycled resilient layer which is on top of three layers of 2mm SBM5.  The SBM5 can be loose laid but the Linoroll and ply should be glued down using a latex adhesive supplied by the vinyl fitters and the vinyl fitted as normal onto the ply.  More information on the Linoroll can be viewed on our web site via this link http://www.soundservice.co.uk/Linoroll_5.html

Links to current prices can also be found on the rhs of each product page or you could call us on 01993 704981 for more information.

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About Sound Service (Oxford) Ltd

UK Stockists and suppliers of a wide range of soundproofing and acoustic insulation materials for blocking and absorbing noise. We have been specialists in soundproofing and sound absorption since 1969 so one of the longest established businesses in the noise control industry.
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