Acoustics:Layout 1 11/09/2009 16:35 Page 47
acoustics
Absorb, reduce or moderate?
By considering the acoustic performance of the roof on an educational building a positive
contribution can be made to the learning environment, says JOHN DUNNINGTON of Euroclad.
F
OR NEW school buildings, compliance
Rain noise moderation
concern. So, for example, it may make
with building regulations can be sense to put a sound absorbing system in
achieved by meeting the standards
Sound created by impact, typically rainfall,
a drama or music studio but install a sound
set out in Building Bulletin 93 (BB93). There
may also be of concern and although it
reducing system in an examination hall.
are ways to comply with BB93 that are
has different characteristics from
With its standing seam profile, the Elite
simple and cost effective and one example
airborne sound it is also dealt with under
System 4 from Euroclad achieves a sound
is to use a roof system with inherently good
Sound Reduction.
reduction of 46dB. Metal roofs like Elite
acoustic performance that can significantly can be produced using a perforated liner
reduce or absorb external and internal noise.
To start with a roof needs to have a
it may make sense
or deck which absorbs sound generated
inside a building. To further enhance its
specified performance for sound
to put a sound
rain noise performance, there is now the
reduction, sound absorption and rain option of an Acoustic Damping Strip.
noise moderation. To select the most
absorbing system in a
suitable roof system to use it is
necessary to understand what each of drama or music studio
www.euroclad.com
the sound performances represents:
but install a sound
Carmathen School.
Sound reduction
reducing system in an
Sound Reduction reduces the amount of
sound transmitted through a building
examination hall
element. It may also be termed Sound
Insulation or Sound Attenuation.
It is important to note that the use of
a building or even an individual room will
Sound absorption
dictate the type and level of acoustic
system required. Sound reduction and
Reverberation of sound within spaces or sound absorption are not complementary;
rooms occurs when sound inside the room when the priority is absorption there are
is reflected from the various surfaces still good levels of reduction but the
exposed to it. The more reflective the greatest levels of reduction are
surfaces are to sound, the longer the compromised. Similarly sound absorption
echoes or reverberations will last. cannot be optimised if reduction is the main
edbmagazine.co.uk 47
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