A heavy-duty suspension system should be specified
when the above described minimum load-carrying
capacity is 230 N per m (16 pounds per linear foot).
Heavy-duty systems are used when ceiling loads are
greater than ordinary commercial construction. See
ASTM C 635 for load testing methods for metal
suspension systems for acoustical tile and lay-in
panel ceilings.
Select classification required to support ceiling
load including acoustical units, lights and other
items supported by suspension system. Light duty
should be specified for residential construction
only. Load carrying capacities based on 1200 mm (4
foot) hanger spacing:
Classification
kg/meter of Main Runner
Direct
Indirect
Furring
Hung
Hung
Bar
Light Duty
7.38
2.95
6.64
Intermediate Duty
17.72
5.17
9.60
Heavy Duty
23.62
11.81
-
Classification
lb/Linear Foot of Main Runner
Direct
Indirect
Furring
Hung
Hung
Bar
Light Duty
5.0
2.0
4.5
Intermediate Duty
12.0
3.5
6.5
Heavy Duty
16.0
8.0
-
Corner caps are not available in all types of wall
moldings and are an extra cost item when available.
Provide seismic details, if a Government designer
(either Corps office or A/E) is the Engineer of
Record, and show on the drawings. Delete the
bracketed phrase, in the last sentence, if no
seismic details are provided.
**************************************************************************
Suspension system shall be [[standard] [fire-resistive] [snap-in metal
pan]] [[exposed-grid] [indirect hung concealed H and T or Zee] [direct
hung, concealed, downward access] [direct hung, concealed, upward access]]
[[standard width flange] [narrow width flange] [narrow width slotted
flange]] [as shown on drawings], and shall conform to ASTM C 635 [for
intermediate-duty systems] [for heavy-duty systems]. Surfaces exposed to
view shall be [aluminum or steel with a factory-applied [white] [black]
[color] baked-enamel finish] [aluminum with a clear anodized finish]
[aluminum with colored factory-applied vinyl paint finish]. Wall molding
shall have a flange of not less than [23 mm 15/16 inch] [_____]. [Inside
and outside corner caps] [[Standard] [Overlapped] [Mitered] corners] shall
be provided. Suspended ceiling framing system shall have the capability to
support the finished ceiling, light fixtures, air diffusers, and
accessories, as shown. The suspension system shall have a maximum
deflection of 1/360 of span length. Seismic details shall conform to the
SECTION 09510
Page 17
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