770
Ceiling Performance Specifications: Performance Criteria
775
PERFORMANCE CRITERIA
775.1
ASSUMPTIONS
775.1.1
The basic structure of the hospital will be a steel or concrete frame with
concrete floor slabs and shear walls. Girders will span columns in the
short direction of the structural bays and beams will span girders in the
long direction. The ceiling will be hung at a uniform height with its top
(platform) surface about 6'6" below the underside of the floor slab and with
its bottom finished surface 9'3" to 10'3" above the top of the structural floor
slab.
775.1.2
Ceiling hangers, to be provided by others, will be " diameter steel rods
with three inches of standard bolt thread at the lower end. Hangers will be
attached by others along the center line of beams, 9'0" on center,
minimum. In the direction of the girders, hangers will be spaced either
7'6" or 5'7-1/2" on center.
775.1.3
The Component Contractor will have access to each floor by stairway and
construction elevator, and if required, by crane. The external wall will be
in place at the time of ceiling installation, but sections may be temporarily
omitted for delivery of large components. Interior two-hour partitions will
be in place running from slab to slab and dividing each floor into areas of
5,000 to 20,000 square feet. The floor topping slab will not be in place
and there will be no depressions in the structural slab. The floor structure
will be designed for a 75 psf uniform live load.
775.1.4
Vertical shafts penetrating enclosed spaces will occur rarely, if at all.
Interior columns will be spaced 22'6" in one direction and from 40'6" to
58'6" in the other direction. Trunk ducts and all main horizontal service
lines will be in place, hung from the structural slab between ceiling
hangers.
775.1.5
No other trades will be present in any space in which the ceiling is being
installed.
775.1.6
Heavy ceiling-mounted equipment which would exceed design live load
capability of 40 psf will be hung directly from the structure above, after
completion of ceiling installation.
775.1.7
All partitions, except two-hour partitions, including door frames, will be
installed after the ceiling is complete. No framing members of these
partitions will penetrate the ceiling.
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