330
Partitions
331
BASIC DESIGN (Figures 330-1 and 330-2)
331.1
TWO-HOUR PARTITIONS
Fire sections and vertical shafts must be bounded by two-hour fire
barriers. Those barriers that are non-loadbearing, interior partitions are
included in this subsystem. They extend from the floor to the underside of
the structural slab above. All other performance characteristics are the
same as described below.
331.2
OTHER COMPONENTS OF THE PARTITION SUBSYSTEM
Except for two-hour partitions and certain smokestop partitions, all
components of the partition subsystem extend from the floor to the ceiling-
platform, and are the same height on any one floor. Included are all types
of non-loadbearing interior partitions, interior door sets and glazed units.
All components must provide a wide range of performance in terms of
impact resistance, finishes, ease of relocation, fire resistance and
acoustics. To maintain the fire resistance and acoustic performance, and
to facilitate access to services, service distribution lines should not be
located within the partitions but should be surface mounted wherever
feasible. The factors governing where to surface mount the services are
discussed in Section 337.3.3.
In some instances, it will be necessary to enclose the surface-mounted
services with furring. (See Section 332.2.1.) The furring should be
extended to the ceiling but kept free of the floor so that maintenance of
floors is facilitated. Furring may be site fabricated or shop fabricated
depending on the degree of repetition and the numbers required.
331.3
HEAD DETAIL
Because of the long structural spans involved in the Prototype Design, the
detail at the head of all components of the partition subsystem must
accommodate deflection by incorporating a "perimeter relief runner" detail.
In addition, the head detail must not degrade the acoustic and fire safety
performance of the partitions. Fire-rated head details will be required for
all rated partitions, and these details should be matched in appearance by
the detail at the head of all other components of the subsystem. Rated
perimeter relief runner details are illustrated in Figure 330-3.
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