bottom of the floor joist to provide the need-
ed clearance above the cold water pipe.
4. Once the components for C have been test
fit, they can be permanently joined and
secured to the wood block with a pipe strap
or with screws through the holes in the wings
of the drop ear ell.
5. The pipe should be plumbed and temporarily
fastened at the top.
Repeat the process described above to
install the hot water drop (D) for the clothes
washer. Given that washing machines are
equipped with quick closing valves, a water
hammer arrestor is needed near the stub-out.
Check the manufacturer’s specification to
determine if the arrestor can be installed in a
horizontal position or if it must be installed
vertically. Drop ear ells should be used at the
stub-out to make it easier to attach the pipe
to the wood block. The 90° ell at the top of
pipe D should extend the same amount
above the bottom of the floor joists as pipe C.
Test fit these components before making the
joints permanent.
Chapter 20 Installing Water Supply Piping
355
Figure 20-5. Water lines for the basement are run from the underside of the floor joists. This makes it unneces-
sary for water lines to be installed below the concrete floor.
Foundation wall
Floor joists
Air hammer
arrestors
Offset hot
water pipe
to clear cold
water pipe
Wood secured
to foundation wall
Air chambers or
water hammer
arrestors
Drop
ear ell
Note:
All pipe &
fittings are 1⁄2″
To kitchen
Laundry tub
Clothes washer
E
F
D
A
B
C