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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
Class O Surface Spread of Flame.
• Where a landlord or previous tenant has
already installed, or is legally committed to • Gypliner Universal ceiling suspended with
installing, approved under current Building Gypframe GL1 Lining Channels at 450mm
Regulations) acoustic separation. maximum centres to give a preferred
minimum cavity of 50mm (maximum of
However both of these circumstances will be 145mm).
exceptions rather than the rule and a new
acoustic ceiling should normally be installed to • 50mm Isover APR 1200 insulation in the cavity
the underside all occupied first floors. (no ductwork within void).
An acoustic ceiling will typically be an MF ceiling
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.

2.5.1 Acoustic Ceilings 3 February 2016