=38. Terra-Cotta Floor Arches.=—The cost of =terra-cotta floor arches=
varies somewhat with the span and with the difficulties encountered
in putting up and removing the centering. If the building consists of
a number of stories, the centering that is used on one floor may be
reused on a floor several stories higher up, in this way decreasing the
outlay for centerings. For ordinary spans, the following analysis of
the cost of a 12-inch arch, exclusive of the cost of the terra cotta
itself, will be found quite accurate, provided the centering is put up
by experienced laborers. The price given is per square foot of arch.
CENTS
Centering 3
Hoisting and laying 3½
Mortar ½
-----
Total 7
This price is for work showing a flat ceiling. If the ceiling is much
broken up by girders, the price, exclusive of the terra cotta itself,
will be about 8 cents per square foot.
As a price per square foot, including the cost of terra cotta, setting,
and mortar, the following figures may be taken. These, however, do not
include the cost of plastering, or of any concrete fill above the terra
cotta.
CENTS
10-inch arches 23
12-inch arches 25
15-inch arches 29
=39. Terra-Cotta Partitions.=—In office buildings, =terra-cotta
partitions= are usually erected on top of a floor in order to divide
the space into such rooms as will suit the tenants. This work is
generally done after the building is otherwise completed. An analysis
of the cost of such partitions is given in Table V.