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ACOUSTIC CONSULTANTS - SOUND AND NOISE MEASUREMENT TESTING AND REPORTING

About Us

We specialise in the installation of soundproofing treatments to Party Walls in houses and apartments throughout Ireland. Our aim is to offer the most professional service, of the highest standards & Integrity to the Homeowner, on the basis of “Honesty is the best policy”. Soundproofing a Home is a once off opportunity and requires the understanding of someone who is fully trained in noisy neighbour’s issues, party wall problems, not just pick a soundproof material and apply it!     

 

Our Management firmly believe that due to the very nature of sound being subjective to each specific individual, it is very important every individual / prospective Client, be fully informed at a Consultancy level before any soundproofing treatment should be carried out.

CHOOSING OUR SOUNDPROOFING SERVICES mean that;

•Only the Highest available “Tested” solutions will be forwarded as a specification.

•All consultations will be with a Qualified Acoustic Consultant.

•All quotations will be in writing and deemed “all inclusive” unless specifically stating otherwise, for a period of 3 months from date of quote.

•All work will be carried out with absolute professionalism in the Client’s Home.

•Only fully trained applicators will be used to install systems.

•All Vehicles will be unmarked & free from signwriting!

 

PHONE AN ACOUSTIC CONSULTANT: 087 2609544 - Domestic Soundproofing Specialist

 

ACOUSTIFIRE – is a registered tradename of E. J. Dalton & Associates Ltd. owned & managed by Mr. Ted Dalton. Ted Dalton took the”Institute of Acoustics” Diploma examinations in 1998 with specialist modules in Noise Control & Architectural / Building Acoustics. In 2005 he was elected to the status of Corporate Member within the Institute, affording him the title of Senior Acoustic Consultant. He has been referred to in articles by the Sunday Tribune as a “Walking Encyclopaedia in Acoustics” & currently provides the Sunday Times “Ask the Expert” answers on soundproofing problems. His background is an Honours Science Degree (B.Sc.) in Surveying, with an experience of 20 years in Surveying, Fireprotection & Sound.

Tech Stuff

 

Loudness- the loudness of a sound depends upon the size of the pressure changes in the medium. The basic measure of loudness is the Sound Pressure Level, which is recorded in decibels (dB). 140 dB is the threshold of pain!

Transmission of Sound - Sound is transmitted between different parts of buildings and between adjacent building in two ways, Airborne & Impact.

Airborne: When sound generated within a room reaches the boundary surfaces some of the energy is reflected back into the room and some generates vibrations within the structure of the building. If there is sufficient energy those vibrations will produce sound on the other side of the structural element. Eg. Televisions, talking, stereos etc…

Impact: direct impacts upon the building structure – such as footsteps, hammering, or door slamming – cause the structure to vibrate and produce sound waves on both sides of the surface impacted. Impact from neighbouring structures is almost impossible to deal with.

 

DnT’w: (Weighted Standardised Sound Level Difference) a single figure measure of the reduction in sound between one room and another – higher values denote better performance. Commonly used to describe the acoustic insulation performance of an item of structure.

The Building Regulations 1997 Technical Guidance Document E – “Sound” state that A wall which –

1.  separates a dwelling from another dwelling or from another building

2.  separates a habitable room within a dwelling from another part of the same building which is not used exclusively with the dwelling, shall have reasonable resistance to airborne sound.

The accepted standard mean average measurement representing reasonable resistance as per the TGD Section E is taken at 53dB (DnT’w), “it may be argued that by todays standards of modern sound equipment and televisions etc. this should be higher”.

 
THE DEGREE OF SOUND INSULATION FROM WALLS & FLOORS
 
AVERAGE SOUND REDUCTION APPROXIMATE EFFECT
20dB Normal speech easily heard
25dB Loud speech easily heard
30dB Loud speech can generally be overheard
35dB (min. desirable standard for acoustic privacy between rooms) Loud speech overheard but not easily distinguished
40dB Loud speech heard only faintly & not distinguished
49dB & Over (min. standard required For separating walls between dwellings) Shouting heard only with difficulty
 
BUILDING REGULATIONS TGD SECTION E - SOUND TRANSMISSION VALUES
 
Type of performance Individual values
Mean Values
Test in at least four pairs of rooms Test in at least eight pairs of rooms
Airborne Sound*
(minimum) 49dB (walls) 53dB (walls) 52dB (walls)

Parti-Walls

From experience it has been found that the majority of parti-walls requiring treatment are of “Plaster Dab” type finish. This type of finish is used for it’s speed in installation & cost effectiveness by Contractor’s. The Building Regulations TGD. Section “E” provided details, recommend that this type of detail ie. forming air cavities should no longer be used, as they are recognised to be problematic acoustically.

The system currently recommended by Acoustifire as being most effective at Parti-Wall soundproofing relies on 3 main acoustic principles, Resilience, Absorption & Mass.

Resilience - The ability of a material or object to return to it’s original shape after an imposed load has been removed.

Absorption - The conversion of acoustic energy to heat energy when incident into a porous material.

Mass - The weight of a material, measured by its cubic metre. In this instance it is specifically the weight of the material dictates it’s inertia ie. it’s resistance to movement due to it’s own weight.

All of the above are frequency or pitch dependent! And give different results dependent on the varying circumstances, often a combination of the three criteria.

Remove plaster dab finish where necessary & expose parti-wall masonry. Supply & fit acoustic batten system @ 600cc/s, infilled with 23kg/M3 density mineralwool rollbatt. Finished layer of 2 No. 12.5mm thick plasterboard, joints staggered, filled and taped left ready for light sanding and redecoration by others. All abbutmets acoustically sealed with flanking strip and specialist sealant.

isostrip-t_1a.gif

Typical Acoustic Detail to Parti-Wall

 

* The complete thickness of the system is 81mm, dependent on the existing wall finish this may be reduced down to as little as 55mm approx.

 

Irish Construction Wall Tests: Data Sheet

A     215mm Thick masonry block wall with 9.5mm thick plaster dab on each side.

BAs above, except 9.5mm dab one side & Acoustic Batten system on treated side.

 

Laboratory results for a recommended system are based on testing to the”Building Acoustics Frequency range” as follows for;

1/3rd. Octave Band Analysis 100Hz – 3150Hz ie. Building Acoustics frequency range.

 

Frequency 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150
Measurement R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB) R(dB)
A Test 47 47.8 43.9 44.5 41.1 39.4 39.6 45.5 52 56.1 63.1 66 69.7 72.3 73.3 72.3
B Test 43.4 50.3 54.3 55 59.1 56.6 58.2 64.6 68.1 70.7 73.7 74.9 75.4 76.5 76.5 74.1
Improvement -3.6 2.5 10.4 10.5 18 17.2 18.6 19.1 16.1 14.6 10.6 8.9 5.7 4.2 3.2 1.8

 

A - overall = 54dB DnT’w

B - overall = 70dB DnT’w

The majority of “Sound Power” in the Human voice is concentrated between 500Hz and 2KHz (or. 2000Hz), the average improvement in the wall’s performance within this frequency range is 11dB approx., this would typically represent an approximate 50% performance increase, perceived by the human ear.

Only latest technology / acoustic highest performance will be specified as there can be no absolute guarantee of subjective satisfaction due to the individual nature of each installation.

 

Every installation is governed by;

    1.    Noise sources are never constant in level.

    2.    Integrity of each wall to be treated is different..

    3.    Reflective sound in each receiving room differs..

    4.    The subjectivity / sensitivity of the Client’s are not measurable.

 

Acoustifire is in no way affiliated to any manufacturer of Acoustic products and does not act as an agent for any product or Manufacturer of same, Acoustifire is wholly independent to select the acoustic upgrade / soundproof solution which will provide maximum performance in each instance.

Faq

Q     I can hear televisions, talking & stereos etc… next door! What can be done for me?

A     The acoustic performance of the Parti-Wall can be increased by the installation of a Proprietary Acoustic Upgrade System.

 

Q     Could I install one of these systems myself?

A      It would not be recommended as the method of installation is critical to the overall performance of the system, in certain instances incorrect installation could increase the original problem.

 

Q     Will I then be soundproof?

A     There is no absolute soundproof in these types of situations, only various levels of sound resistance dependent on the nature of the sound ie. It’s volume (Sound Pressure Level), It’s pitch (Frequency) and many other parameters of the building itself. All of these as far as possible are explained at initial consultation during survey.

 

Q     I can hear doors banging and people walking around next door etc… what can be done for me?

A     Unfortunately very little, as these are impact noises (carried by the structure) and must be treated at the point of source of the impact, therefore they are not treatable from the complainant’s side of the parti-wall. Only Airborne noise is treatable using a parti-wall upgrade system although the nature of the system means it will not resonate due to impact noise it’s surface is small compared to those generally and little benefit if any will be perceived.

 

Q     How long does it take to install?

A     Normally one working day per room in a domestic situation, inclusive of refitting covings, plugs etc…

 

Q     I don’t want the neighbour to know that I am having this work done! Do your vans say, Noisy Neighbours, Soundproofing or Noise Control?

A     All Company vehicles are completely free from signwriting .

 

Q     How successful are Parti-Wall upgrades? Can you give me any references?

A     In general they are very successful, but information is the key to any “Sound” decision. The Company in order to protect Client’s past & future do not give out personal information however it is possible to check professional references that may be given upon request.

 

Q     Do I need to soundproof every Part-Wall in my house?

A     It is only necessary to treat the wall in the rooms that you are specifically concerned about, this obviously may change over time so therefore you can have any wall treated whenever you like. In fact we recommend this to allow for best subjective critique of the results!

 

Q     Do you need to treat around the fireplace in my sitting room?

A     It is not necessary to treat around the fireplace only to treat the alcoves on each side of the wall.

 

Q     Will I need to redecorate and how soon? Is it a very messy job? What about my furniture in the room, will I need to move it out?

A      You can repaint the following day if you like although we would recommend that you wait a day or two, to allow the plasterboard joint filler to dry properly. Remember it’s best to seal the wall first before placing on intended final coats of colour paint even before wallpapering! The job is not very messy but there may be a settlement for a day or two after, as this has been in the air in the room. We do recommend that as much as possible the furniture is removed from the room.

 

Q     I have a specific question not asked here, how can I get an answer?

A     Contact Mr. Ted Dalton (Senior Acoustic Consultant) about any sound issue at Mobile. Ph.087 2609544

 

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