PART 3
EXECUTION
3.1
PREPARATION
Project conditions shall be verified as ready to receive the work. Field
measurements shall be verified for compliance with approved detail drawings
and manufacturer's published recommendations. Beginning of installation
means installer accepts existing conditions.
3.2
SUSPENDED CEILING FRAMING INSTALLATION
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NOTE: When the spacing of steel construction
members, including bar joists, does not permit the
use of the specified attached ceiling channel
spacing or suspended ceiling hanger spacing,
intermediate members and connections will be made a
part of the structural design and shown on the
drawings. An attached or suspended ceiling
occurring under steel roof-deck construction will be
supported from the structural members, and the
intermediate members and connections will be made a
part of the structural design and shown on drawings.
Applicable subparagraphs will be deleted when
suspended ceilings are not specified.
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Suspended system shall be installed in accordance with ASTM C 841. Where
channels are spliced, the ends shall be overlapped not less than 300 mm 12
inches for 38 mm 1-1/2 inch channels and not less than 200 mm 8 inches for
20 mm 3/4 inch channels with flanges of channels interlocked and securely
tied near each end of the splice with two loops of the tie wire. Splices
shall be staggered.
3.2.1
Hangers
Wire or strap hangers shall be attached to structural members in accordance
with ASTM C 841, except hangers shall be spaced not more than 1220 mm 48
inches along runner channels and 900 mm 36 inches in the other direction or
1050 mm 42 inches in both directions unless otherwise indicated or
approved. Locations of hangers shall be coordinated with other work.
Hangers at ends of runner channels shall be located not more than 150 mm 6
inches from wall. Hanger wire shall be looped around bottom chord of
open-web steel joist or secured to structural elements with suitable
fasteners. Sags or twists in the suspended system shall be adjusted.
Damaged or faulty parts shall be replaced.
3.2.2
Main Runners
Main runner channels shall be installed in accordance with ASTM C 841.
Hanger wire shall be saddle-tied to runner channels, and the end of hanger
wires shall be twisted three times around itself. Main runners shall not
come in contact with abutting masonry or concrete walls and partitions.
Main runners shall be located within 150 mm 6 inches of the paralleling
wall to support the ends of cross furring.
3.2.3
Furring Channels
Furring channels shall be spaced in accordance with ASTM C 841 for the type
SECTION 09200A
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