320
Ceiling: Other Design Criteria
327
OTHER DESIGN CRITERIA
327.1
DEFLECTION
The suspension system for the platform must incorporate leveling devices
to take up deflection from structure or ceiling dead loads. For compatibility
with partitions, actual expected live-load deflection from combined live
loads on the structure and ceiling subsystems should produce deflections
compatible with the partition/ceiling junction detail; typically, " can be
accommodated. (See Figure 330-3.)
327.2
TOLERANCES
Tolerances must be in accordance with VA Construction Standards and
Master Construction Specifications.
327.3
SURFACE CHARACTERISTICS
It must be possible to glue or mechanically attach any conventional
finished ceiling to the underside of the platform.
The walking surface of the platform must have a finish, or capability of
receiving finish materials with the following characteristics:
1. Sufficient resistance to abrasion and impact to permit maintenance
personnel to walk on the surface without affecting the structural
integrity of the platform and without generating a dust problem.
2. Sufficient resistance to moisture so that accidental leaks in pipes will
not cause structural failure.
3. Easily penetrated and repaired.
4. See Section 325 and 326 for acoustic and fire safety criteria.
327.4
ADAPTABILITY
The platform and suspension system are regarded as permanent parts of
the building, whereas the finished ceiling, which may require a wide
latitude of performance, is an adaptable component. Adaptability of the
platform is, therefore, primarily a question of access to, and support of
certain components of other subsystems, as well as the finished ceiling.
1 - 161
Previous Page
