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2.5 Ceilings

2.5.1 Acoustic Detail 1
In order to satisfy the requirements of Part E New acoustic insulation and fire protection to
(Resistance to sound) of the Building Regulations, existing timber floor (existing ceiling retained)
it is necessary to install an acoustic ceiling in between new A5 use at ground floor and
virtually every store where there is occupation existing residential use at first floor:
on a first floor above us. The only exceptions
being: N.B. If existing ceiling is lath and plaster, this should be
supported by chicken wire securely fixed to underside of
• Where we have sufficient detail of the joists.
construction of a modern building to prove
the acoustic properties of the concrete slab Ceiling upgraded to give improved airborne
above us, or sound insulation, 60 minutes Fire Resistance and
• Where a landlord or previous tenant has Class O Surface Spread of Flame.
already installed, or is legally committed
to installing, acoustic separation. • Gypliner Universal ceiling suspended with
Gypframe GL1 Lining Channels at 450mm
However both of these circumstances will be maximum centres to give a preferred
exceptions rather than the rule and a new minimum cavity of 50mm (maximum of
acoustic ceiling should normally be installed to 145mm).
the underside all occupied first floors. • 50mm Isover APR 1200 insulation in the cavity
An acoustic ceiling will typically be an MF ceiling (no ductwork within void).
with insulating quilt above it, as detailed below • Ceiling lining to be 2 layers of 12.5mm
This will reduce the effective ceiling height by Gypsum Fireline with taped and filled joints.
upto 145mm and this needs to be taken into
account. N.B. If there is no existing ceiling in place (i.e. joists exposed),
then the new construction above should be upgraded to
Please note that we have agreed a set of include 100mm thick Isover APR 1200 insulation.
standards for acoustic/fire ceilings with BRCS
Building Control, for England and Wales.
( It is possible that Scotland/N.I./ROI may have
different requirements and this must be borne
in mind.)

There are three standard agreed options,
depending on the existing user classes and
building construction, and ONE of these MUST
ALWAYS be used unless specifically agreed for
the building in question. In all instances the final
details of all acoustic and fire linings subject to
building control approval.

2.5.1 Acoustic Ceilings 3 February 2016