Secondary Double Glazing
|This is an an architectural aluminium secondary glazing system anchored into a hardwood subframe for maximum sound insulation and should not be confused with upvc or aluminium diy kits, it is fitted in St Paul's Cathedral and Teesside airport to name a tiny few of the architectural projects that this system has been used.|
DEPARTMENT OF THE ENVIRONMENT
AND THE REGIONS
PROPOSALS FOR AMENDING PART E OF THE BUILDING REGULATIONS 2000
TO THE PASSAGE OF SOUND
APPROVED DOCUMENT E
PROTECTION AGAINST SOUND FROM ADJOINING DWELLINGS OR BUILDINGS
AGAINST SOUND FROM WITHIN A DWELLING
FROM NOISE FROM EXTERNAL SOURCES
IN THE COMMON INTERNAL PARTS OF BUILDINGS CONTAINING DWELLINGS
CONDITIONS IN SCHOOLS
PART E FROM THE LIST GIVEN IN THE BUILDING REGULATION 8, AS IT WILL BE
CONCERNED WITH WELFARE AS WELL AS WITH HEALTH
THE MATERIAL CHANGE OF USE REGULATIONS TO EXTEND PART E TO COVER HOTELS,
BOARDING HOUSES AND ROOMS FOR RESIDENTIAL PURPOSES
A NEW BUILDING REGULATION AND A NEW IMPROVED INSPECTOR REGULATION WHICH
GIVE BUILDING CONTROL BODIES THE POWERS TO ASK BUILDERS TO CARRY OUT PRE
- COMPLETION TESTING OF SOUND INSULATION ON SPECIFIED DWELLINGS
current sound insulation standard originates from the 1950's and since
that time there
been a substantial improvement in living standards.
This has lead to poor compliance
low satisfaction with the existing sound insulation standards.
It is estimated that upto
of separating floors and 25% of new separating walls may fail to meet
proposed amendments to Part E will be enforced at Hotels, Hostels and
residential accommodation from 1st July 2003, as for houses
and flats they must meet
new standards by 1st January 2004 or the National House
exposure to loud and disturbing sounds means that the body can produce a
stream of adrenaline, a state that can lead to hypertension,
sexual dysfunction. (Time Magazine 1998)
"From a noise level of 60dB, stress appears together with sleep
and intellectual performances decrease". (Prof. Lehman, Max Planck
examples of where noise can contribute to a variety of health problems.
new Document is intended to protect health by reducing sleep disturbance
by noise. It also targets
low frequency noise, with the main causes being
as airborne and impact noise. You will see it applied to all new dwellings
this will also include "change of use".
It proposes new sound insulation
and internal noise levels for dwellings.
of the existing envelope against external noise is currently achieved
the planning system. The
proposal is that this should be transferred to
control, leaving site layout issues with the planning authority.
similar approach to that used for Requirement E1 gives examples of
to perform reasonably but also allows any type of construction to be
the limits on internal noise levels are met.
The Approved Document gives guidance
how to improve performance. Published
comprehensive technical guidance has not
previously available on this subject under either the planning or
BUILDING ENVELOPE INSULATION
This section provides guidance on meeting the requirement for protection
from external sources. It
is intended to apply to all rooms both in new buildings
those undergoing material change of use. It is also intended to apply to loft and
guidance is also provided in BS
section gives examples of envelope constructions, which if built
correctly, should provide sufficient sound insulations in most
instances. The aim of the
guidance is to ensure that the target internal noise levels are not
requirements of Approved Documents B, F, J and L should also be
constructions for external levels not exceeding 55dB LAeq,16h
'low noise' sites (where the external noise levels do not exceed the
above levels) the internal target levels are likely to be achieved
without any façade construction, which complies with the other parts of
the Building Regulations.
C - C2 gives guidance on identifying low noise sites.
constructions for external levels not exceeding 60dB L Aeq,16h or
envelope constructions are given in Table 7.1 below.
7.1 Example envelope constructions for external levels not exceeding
60dB LAeq,16h or 50dB LAeq,8h
constructions for external levels not exceeding 65dB LAeq,16h
or 60dB LAeq,8h
envelope constructions are given in Table 7.2 below.
7.2 Example envelope constructions for external levels not exceeding
65dB LAeq,16h or 60dB LAeq,8h
Envelope constructions for external levels not exceeding 75dB LAeq,16h or 65dB LAeq,8h
envelope constructions are given in Table 7.3 below.
7.3 Example envelope constructions for external levels not exceeding
75dB LAeq,16h or 65dB LAeq,8h
constructions for external levels exceeding 75dB LAeq,16h or
development is allowed at these levels, a specialist should be
Change of use
example envelope constructions will be relevant to many buildings
undergoing a material change of use, where the existing constructions
are similar. The
performance of other building envelopes can be determined using the
guidance in annex C- 3.
it is necessary to retain existing windows (for example in conservation
areas), a secondary glazing system can be used instead of sealed units.
This may mean that the target internal levels are not met.
should be noted that the constructions will not provide sufficient
insulation in the loft, should it be used as (or converted into) a
living space. Specialist
advice is likely to be necessary for conversions of lofts and other
AIRBORNE SOUND INSULATION OF A BUILDING ENVELOPE
The airborne sound insulation of a building envelope should be measured
in accordance with BS EN ISO 140-5:1998.
All measurements and calculations should be carried out in
one-third octave frequency bands. The
standard gives options on how the measurement may be conducted.
For the purposes of the Approved Document the preferred procedure
is the global road traffic (or train or aircraft) method with the
microphone positioned 2m in front of the façade.
should be preferably made in unoccupied buildings, so that all external
sources of noise may be switched off.
The background noise referred to in BS EN ISO 140-5:1998 should
be taken to compromise internal and equipment self noise.
C5: Values of sound reduction index (R) for typical building elements
It can also be convenient to determine the external noise level at the most exposed window of a building and to assume this result for other elevations, or for larger sites the most exposed elevation.
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