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ACOUSTIC CONSULTANTS - SOUND AND NOISE MEASUREMENT TESTING AND REPORTING

Separating Walls & floors

 

All recently constructed domestic buildings are subject to meeting the requirements of The Building Regulations 1997 with regard to sound insulation provided by the structure of the property, specifically with regard to Technical Guidance Document E "Sound".

The Building Regulations 1997, Part E of the Second Schedule state the following guidance;

A floor which separates a dwelling from another dwelling … shall have
reasonable resistance to airborne sound.


A wall which separates a dwelling from another dwelling …shall have
reasonable resistance to airborne sound.


A floor which separates a dwelling from another dwelling … shall have reasonable resistance to impact sound.

 

Test Method

 

Section 4 of Technical Guidance Document E describes a test method to be employed in order to establish whether a particular construction present in one development, will be suitable for use in another development. A table sets out guideline sound transmission values that should be achieved under test if the acoustical performance is to be deemed acceptable for these purposes. In the absence of any other form of objective guidance, these values are often employed as a basis for assessing sound insulation performance. The contents of the table relevant to the tests performed in this case are reproduced below.
 

Type of Performance Individual Values Mean Values
    Tests in at least four
pairs of rooms
Tests in at least eight
pairs of rooms
Airborne sound*(Minimum Values) 49dB (walls) 53dB (walls) 52dB (walls)
48dB (floors) 52dB (floors) 51dB (floors)
Impact Sound**(Maximum Values) 65dB (floors) 61dB (floors) 62dB (floors)

* Airborne Sound - Weighted Standardised Level Difference (DnT,w)
** Impact Sound – Weighted Standardised Sound Pressure Level (LnT,w).

When testing at least four examples of a wall/floor construction, it is suitable to assess the sound insulation of individual wall/floor constructions in relation to the "Individual Values" above, but subject to the mean value of the test achieving the relevant "Mean Values" above. To ensure compliance with the Buildings Regulations (1997) when there have been tests on at least four examples of a wall/floor construction, individual values should be no less than 49dB (DnT,w) for walls and 48dB (DnT,w) for floors with the mean of all the tests achieving a minimum measured airborne sound insulation of 53dB (DnT,w) airborne for walls and 52 (DnT,w) airborne for floors, impact 65 dB (LnT,w) individually and a mean of 61dB (LnT,w) for floors (only).

The methods as listed in TGD Section "E" 1997 for such testing of walls and floors, with the reporting of results to same, have been superseded by the following:-

  • Airborne Testing of Walls & Floors to- BS EN ISO 140-4: 1998 "Field Measurements of Airborne Sound Insulation between Rooms"
     
  • Impact Testing of Floors to- BS EN ISO 140-7: 1998 "Field Measurement of Impact Sound Insulation of Floors"
     
  • Calculation of Airborne Results to- BS EN ISO 717-1: 1997 "Rating of Sound Insulation in Buildings and of Building Elements - Airborne"
     
  • Calculation of Impact Results to- BS EN ISO 717-2: 1997 "Rating of Sound Insulation in Buildings and of Building Elements - Impact"
     
 

Test Equipment

 

E.J. Dalton & Associates Ltd. – currently carry out all relevant testing to these specific standards for Homeowners, Architects / Designers, Contractors & Developers without discrimination. The company has the ability to test, report and forward details for remedial work where necessary; it also provides advice on interpretation of results where legal proceedings are inherent. All equipment is calibrated as per requirements for legal measurement undertakings.

Test Equipment: ANV Measurement Systems
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Rion NA-27 (Class 1) SLM Dodecahedron Speaker System
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Norsonic 211 Tapping machine Rion NC-74 (Class 1) Sound Level Calibrator
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ANV RC Pink Noise Generator Typical expression of results measured

 
 

Services

 

E.J. Dalton & Associates Ltd. – offer measurement services which can determine the sound insulation provided by the floor (airborne & impact), wall (airborne) or façade (airborne) etc. of the building. The results of such measurements can be examined in detail stating compliance or non compliance with current Building Regulations ie. TGD Section E 1997. Remedial measures may then be specified to rectify / improve the current acoustic performance to achieve compliance or higher in specialist cases.

 
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