750
Cost and Time Analysis: First Cost
application of intumescent mastic, and the strongbacks are protected with
field-applied "Monocoat" (vermiculite and gypsum sprayed-on coating)
plus a hardcoat finish to provide physical protection.
The high total assumes a lightweight precast concrete platform and 70%
partitions and mechanically attached to the platform. A sprinkler system is
used throughout the functional zone to provide indirect protection of the
supporting framework.
The major variables affecting the cost of the ceiling subsystem are the
materials selected for the platform, the method selected for fire protection
of the ceiling hangers, and the type and quantity of various finished ceiling
materials used. The latter varies not only in the material and finish itself,
but also in the way in which it is attached to the ceiling and whether it is
continuous or interrupted (See Section 322.2).
751.2.3
Partitions
The target cost range for partitions is between .33 and .88/OGSF, or
from .75 to .00 per lineal foot of partition. These figures are lower
than the comparable cost base range of .26 (Memphis) to .35
(Washington), and the average cost per lineal foot of .85 for the
system compares with .50 for conventional design and construction.
This reduction is due primarily to the use of less vinyl wall covering, the
substitution of drywall for block and lath and plaster, and stopping the
partitions at the ceiling. The full effect of these characteristics has been
offset by additional items such as continuous back-up plates, furring
around services, special details required to accommodate the greater
deflections resulting from increased structural spans, and the need for two
layers of gypsum on both sides of corridor partitions. (See Section 336.1
for an explanation of this last requirement.)
The costs do not reflect any savings which would result from the more
rapid installation of the system partitions as compared with conventional
partitions because these savings are not likely to be reflected in the
subcontractor's prices in the first few projects using the Prototype Design.
Indirect savings will be evident through a contraction of construction time.
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