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Fit Out and Second Fix 539
Wire hangers are plugged and
screwed, or gun nailed to the
structure then simply tied around
the main runner at regular centres
at the correct level
Mineral fibre, 300 panel, 600
or 1200 mm modules most
common. Panels can be easily
lifted to access services or
replace panels
Concrete floor or roof
Exposed grid. All of the
runners and secondary
runners can be seen
Air handling units and
lights can be easily
accommodated within
the ceiling
Main runners of
ceiling grid tied to
the structural ceiling
Secondary runner rests on
main runners
Figure 10.3 Suspended ceiling.
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Electrical earthing and bonding. The ceiling grid must be earthed. In the event of any
electrical fault, the parts of the ceiling capable of carrying an electrical current are
earthed and protected.
Ceiling assembly
A wide variety of ceiling systems are available (Figure 10.3 and Figure 10.4 and Photograph
10.3 and Photograph 10.4). There are two primary components to a suspended ceiling, the
ceiling tile and the support grid. Combined, the components provide a lightweight and
level ceiling finish. The design life of the ceiling tiles tends to be anything up to 25 years,
that of the support system around 50 years. The loading capacity of the system is sufficient
to carry the weight of the system and associated equipment. Heavy fittings will require
independent support from the underside of the structural floor. Manufacturers should also
provide details of the air leakage (at 25 Pa), the fire rating (e.g. Class 0) and the combined
weight of the system, which will vary slightly with the depth of the hangers. Acoustic performance
of the system should also be provided.
Ceiling tiles
Ceiling tiles are manufactured to a nominal size of 600 × 600 mm. Tiles are made from
gypsum, mineral wool, pressed lightweight steel or a lightweight material, such as particleboard,
and usually have a paint finish. The majority of systems rely on a gravity fit, with