Table 5-2.Minimum Size Fixture Supply
Water closet (tank type)
Flushometer urinal with
As per the National Standard Plumbing Code,
table 5-2 shows the minimum supply pipe diameters.
After roughing-in, you can easily install the
plumbing fixtures and trim work. Instructions are
given here for the installation of various fixtures and
accessories. We cannot include every type of fixture
you will install; but if you learn to install the fixtures
covered in figures 5-1 through 5-6, you should not
have any problems with other types.
Water closets come in various shapes, designs, and
colors. The device is designed to receive human waste
and dispose of the waste properly in a sanitary sewer
system. Most water closets mount on the floor, but
there are models that are wall hung. Modem water
closets have various design features which create
different flushing actions. To read more on the various
designs and flushing action principles, see the
publication titled Plumbing Installation and Design by
L. V. Ripka.
Figures 5-1 through 5-6 show single-line
drawings of general rough-in measurements for
various fixtures. The figures show general
measurements and will vary depending on type of
fixture and manufacturer. It is your responsibility to
identify the fixtures you will be using, so you can
obtain the proper rough-in measurements.
To install a water closet (fig. 5-7), follow these
procedures as a general guide.
1. Slip the water closet flange over the closet bend
and slide it down until it is level with the finish floor.
2. Prepare the joint for a lead-caulked joint; pour
and caulk the water closet flange to the closet bend.
Service connections for steam radiators depend
3. With hammer and cold chisel, break off the
upon the sizes to be installed and location of each. The
portion of the closet bend that projects above the water
same holds true for water tanks used for storing or
closet flange. Do not break the closet bend below the
Figure 5-1.Tank-type water closet.