750
Cost and Time Analysis: First Cost
4. The number of clusters of services enclosed with furring. This type of
cluster will typically occur in patient bedrooms, examination rooms and
treatment rooms.
5. The number of two-hour fire barriers which must also act as shear
elements and are therefore included in the structural subsystem.
751.2.4
Heating-Ventilating-Cooling
The target cost range for HVC is between .00 and .50/OGSF. These
figures are below the cost base range of .92 (Miami) and .62
(Watsonville) because of the reduced amount of ductwork in a
decentralized arrangement, and reduced labor costs during installation
due to less conflict with other trades (organized arrangement of services in
a deep service zone) which more than offsets increased costs for
redundancy in service distribution and size of equipment and ductwork
and decentralization of air-handling units.
The lower end of the target range is the estimated cost of a single-duct,
terminal-reheat system with plenum exhaust/return, but without a
supplementary perimeter convector system, in a building of simple
configuration in a mild climate. The upper end of the range would be
appropriate for a dual-duct, mixing-box system, plus ducted exhaust/return
and a perimeter convector system, in a building of complex configuration,
including interior service bays, located in an extreme climate and
containing a relatively high proportion of functional areas with special HVC
requirements.
The cost effect of a compound assembly (complex building configuration)
as compared with a simple assembly is to add about
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.25/OGSF forducting into the internal service modules (assumed to be one-half of all
modules at most). The use of supplementary perimeter convectors adds
about
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.40/OGSF.751.2.5
Plumbing Distribution
The target cost range for plumbing distribution is between .00 and
.00/OGSF. These figures imply a typical cost slightly higher than those
estimated for Memphis and Miami, .09 and .20 respectively. This rise
can be attributed to the increase in the number of horizontal mains and the
oversizing of permanent runs to allow for demand increases.
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