Testing from Druk Limited
is sound insulation?
may be thought of as the ability of a building or an element to resist the transmission
of sound to adjacent rooms or spaces.
How is sound transmitted through
The study of how sound travels through buildings can
be very complex indeed, however it is possible to think of sound travelling either
directly or indirectly through a building. Direct sound transmission does just
that, it passes between two adjacent spaces via the wall or floor that separates
them. Indirect transmission, often called flanking transmission, of sound then
occurs via any route other than the direct route. It is however worth remembering
that sound transmission can be very complex and that this is a very simple description
In most everyday situations the transmission of sound is made
up of both direct and indirect components, and the contributions of these two
components can and often does vary greatly.
Why is it important?
Typically, most people think of sound insulation in terms of their own homes.
Most commonly, should you live in a terraced house, a semi-detached house or a
flat you may at certain times be able to hear noise from your neighbours. The
better is the sound insulation of the wall and/or floor that separates you from
your neighbours, the less you will be able to hear, providing your neighbours
don't turn up the volume!
are the Building Regulations for Sound Insulation?
an attempt to ensure that a reasonable level of sound insulation will exist between
different types of residential dwelling, the Building Regulations Approved Document
E (ADE) "Resistance to the Passage of Sound" sets minimum standards
for sound insulation. In this document sound insulation is referred to as airborne
sound insulation, and this may include things like voices and noise from televisions
and stereos, or impact sound insulation of floors which is commonly though of
as the sound of people walking across the floor. It should however be remembered
that these are typical examples of airborne and impact noise, it is not an exhaustive
The minimum values of sound insulation relate to many types of
dwellings: houses (terraced and semi-detached), flats, hotel rooms etc. Depending
on whether the dwellings are new build or conversions, different minimum values
of sound insulation exist.
First and foremost,
sound insulation testing is usually required by Building Control Bodies to demonstrate
that the separating wall and or floor have complied with the minimum standards
specified in ADE. It is not necessary to test everything; a minimum number of
tests are detailed in ADE, although Building Control Bodies can require more or
less testing to be carried out.
Despite this it is not always necessary
to test the sound insulation of a building; again these exceptions are detailed
Why choose Druk?
We have many years of sound
testing experience and endeavour to provide a professional cost effective service
that meets our customer's needs. In addition Approved Document E requires that:
"Test bodies conducting testing should preferably have UKAS accreditation
(or a European equivalent) for field measurements. The ODPM also regards
of the ANC (Association of Noise Consultants) Registration
Scheme as suitably
qualified to carry out pre-completion testing".
With this requirement
in mind, Druk are UKAS accredited for the purpose of pre-completion sound insulation
When should sound insulation testing be carried out?
In order to get the best possible results it is best to test when the
building is structurally complete and to all intents and purposes finished. Ideally,
testing should be undertaken before buildings are occupied, and furnished; although
it is not impossible to test when a building is occupied, it just means that the
occupants will have to tolerate a degree of disturbance.