There are two major
systems in a house, DWV and potable water supply.
DWV stands for drain, waste and vent.
Since fixtures must drain, the DWV system carries
the waste water out of the house to the sewer or
septic system. This is usually accomplished with
plastic pipe known as ABS or PVC. ABS is a black
pipe and PVC a white colored pipe. ABS and PVC make
up the majority of pipe installed in homes today.
No hub cast iron is still used but is is much more
expensive. The DWV pipes ranges from 1½"-
4" in diameter.
Each fixture needs potable water supply. This is
done using copper, PEX or CPVC (PEX and CPVC are
plastic pipe). The water supply pipes range from
3/8"- 1" in diameter. In the case of both
DWV and supply lines, the plumber must use the appropriate
size to make the system work properly. The supply
system has a main shut off, and each fixture generally
has individual shut-offs.
In the planning
stages you will need to sit down with your plumber
and plan out his phase of the job. Good plumbers
will be knowledgeable and be able to give advice
about the latest trends, techniques and products.
Once items are agree upon put them into writing
on the specification sheet.
During the planning stages it is a good idea to
walk through the house and discuss the locations
for the main waste runs, and the fixtures. Although
the plans show the locations of the fixtures it's
good to mark their location on the floor.
to make sure that the fixtures are in the correct
position according to the plans.
Make sure that the fixtures, faucets and valves
and materials that are installed are the model
and brand (or equivalent) of those specified in
the construction specifications.
your local inspecting body doesn't require a pressure
test on the plumbing system let the plumber know
that you require a test on the DWV system and
water supply system.
Keep your plumber informed of your schedule. Subcontractors
need to know approximately when they will be needed
on a job. Go to the contracts & scheduling
page for more information.
in advance who will call for the plumbing inspection.
It is better if the plumber coordinates this as
the plumbing will need to be pressurized and or
filled with water for the inspection.
that the materials, fixtures and equipment conform
with the specifications.
sure any changes, additions or fixes are communicated
to the plumber while he is on the job. Call backs
cost time and money.
site daily for progress.