=96.= An approximate figure for the cost of =plumbing= is 10 per cent.
of the cost of the building. This figure is for good materials and
labor, and of course is subject to considerable variation. The cost of
labor alone will average about one-fourth the cost of the materials.
=97. Drainage System.=—In making estimates for the =drainage system=,
measure all horizontal pipes from the plans and all vertical pipes from
the sectional drawings.
Commence at the sewer outlet and measure the main-sewer line forwards
into the building; then measure the horizontal branches.
Measure the vertical, soil, waste, and vent stacks to their
terminations above the roof, and waste-pipe branches to the fixtures on
the several floors.
Itemize the several pipes in the different kinds and classes.
Estimate all earthen pipe by the linear foot, allowing for Portland
cement in the joints.
Estimate all cast-iron pipe by the linear foot, allowing for each joint
¾ pound of lead for every inch in diameter of the pipe.
Estimate wrought pipe by the linear foot, inclusive of couplings.
Estimate brass, copper, and lead pipe by the pound.
Estimate all traps, bends, branches, increasers, reducers, and other
fittings separately, except such special brass fixtures, traps, and
connections as are included in the cost of the fixtures. Do not figure
lead bends that are smaller than 2 inches.
Estimate on brass ferrule connections at all points where lead pipe
joins iron pipe.
Estimate on all solder joints (wiped), allowing 1 pound of solder for
every inch inside diameter of the pipe.
=98. Water-Supply System.=—For water supplied from street mains, allow
for permits, corporation tapping, and curb box.
Measure the service pipe from street main to cellar, and allow for a
stop and waste cock inside the cellar wall.
Measure all horizontal distributing pipes from the plan views of
the building and all vertical distributing pipes from the sectional
drawings.
Measure all branches for the several fixtures on the different floors,
to the lawn hydrants, etc.
Itemize the different kinds and classes of pipes.
Estimate lead, brass, and copper water pipes by the pound, and wrought
water pipe by the linear foot.
Itemize all stop-cocks, pipe supports, straps, hangers, etc. separately.
Estimate all water-pipe fittings less than 1½ inches by the pound.
Figure on brass solder-nipple connections in all places where lead
pipes join iron pipes.
Estimate on kitchen boiler, sediment cock, and range connections; also
on faucets for all fixtures other than those which are included in the
costs of the fixtures.
Estimate on garden hydrants and lawn sprinklers, and allow a stop and
waste cock in cellar for each.
=99. Well Supply.=—For water supplied from a well, figure on
double-action force pump in kitchen or laundry if the well is not
deeper than 26 feet below the pump; for a deep well, estimate on a
pumping engine or a windmill.
Measure lead tank linings in square feet, and estimate by the pound,
allowing 1 pound of solder for every 2 feet of seams.
Allow 2 feet of lead pipe to connect iron pipes to house tank, and for
stop-cocks close to tank.
Provide for telltale and overflow pipes for tank.
Estimate copper tanks in square feet and by the pound.
If there are iron, slate, glass, or cedar tanks, figure them
separately.
=100. Fixtures.=—Estimate each =fixture= separately, and include traps,
faucets, waste, vent, and water connections to walls or floors. When
the sewer is long and has but little fall, figure on using a grease
trap for the kitchen sink.