The example shown in Figure 20-3 is for an
electric water heater. If installing a gas water
heater, the only difference is that a pipe must
be run from the gas meter to the water heater,
and a flue must be installed. For additional
information on gas pipe installation, see
Chapter 25.
Installing Water Supply
Piping to the Kitchen and
Laundry Room
Before extending the hot and cold water
lines from the water heater to the kitchen and
bath areas, check the position of stub-outs in
each location and determine the most practical
route to run the pipes. From this point forward,
it is critical to remember that the cold water
stub-out is always installed to the right of the
hot water stub-out as you are facing the
installed fixture.
Consider how the hot and cold water pipes
are routed around the DWV piping and any
other obstructions, such as heat ducts. The
water supply pipes in this case must be offset
into the exterior wall; in much the same way as
the sink drain was installed. Having selected a
route for the pipes, begin with the kitchen and
install the stub-outs for the sink, Figure 20-4.
The vertical pipes that go through the sole
Chapter 20 Installing Water Supply Piping
353
Figure 20-4. In this installation, water supply pipes must be offset around the foundation so they can enter the
exterior wall. In cold climates this type of installation is questionable because of the risk of freezing.
45° ell
Stud
Sole plate
Subfloor
Air chambers
Stub-out
w/ cap
Tee
Cap
Hot
water
Rough-in height
Foundation wall
Sill
1. Raise or lower
assembly
2. Mark
3. Temporarily install
1⁄2″ horizontal pipe
4. Mark
1⁄2″ pipe
Riser
Option A
Air hammer
arrestor
Adapter
Drop
ear ell
Riser
Option B