3.1.1.1
Plumb Hangers
Hangers shall be plumb and shall not press against insulation covering
ducts and pipes. Where lighting fixtures are supported from the suspended
ceiling system, hangers shall be provided at a minimum of four hangers per
fixture and located not more than 150 mm 6 inches from each corner of each
fixture. [See Section 16510 INTERIOR LIGHTING for additional lighting
installation requirements.]
3.1.1.2
Splayed Hangers
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NOTE: The designer will add a detail to the
construction drawings detailing the proper method of
splaying and countersplaying hangers when hangers
must be splayed (sloped or slanted) around
obstructions.
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Where hangers must be splayed (sloped or slanted) around obstructions, the
resulting horizontal force shall be offset by bracing, countersplaying, or
other acceptable means.
3.1.2
Wall Molding
Wall molding shall be provided where ceilings abut vertical surfaces.
Miter corners where wall moldings intersect or install corner caps. Wall
molding shall be secured not more than 75 mm 3 inches from ends of each
length and not more than 400 mm 16 inches on centers between end
fastenings. Wall molding springs shall be provided at each acoustical unit
in semi-exposed or concealed systems.
3.1.3
Acoustical Units
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NOTE: In areas where the ceiling will be subject to
impact or where lay-in ceiling units are subject to
pressure differentials between the air plenum above
the ceiling and the space below, units will be
specified to be held in place with manufacturer's
standard hold-down clips.
If the ceiling has a fire endurance rating or the
panels weigh less than 4.9 kilograms per square
meter (1.0 pound per square foot), hold down clips
are required. Hold down clips may also be specified
where frequent cleaning is required to prevent
displacement during cleaning.
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Acoustical units shall be installed in accordance with the approved
installation instructions of the manufacturer. Edges of acoustical units
shall be in close contact with metal supports, with each other, and in true
alignment. Acoustical units shall be arranged so that units less than
one-half width are minimized. Units in exposed-grid system shall be held
in place with manufacturer's standard hold-down clips, if units weigh less
than 5 kg per square m 1 psf or if required for fire resistance rating.
SECTION 09510
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