User Guide

80 l uponorengineering.com
Use appropriate floor
assembly per code
Uponor AquaPEX
pipe risers ½" to 3"
Appropriate firestop
material (must be
Uponor AquaPEX
compatible)
Mid-story guide
required between
each floor. Maximum
spacing is 5 ft. (1.5 m)
Riser clamp required
at the base of
each floor
Wall-framing member
Refer to appropriate
fire assembly listing
for penetration
requirements
Riser clamp required at the
top of every other floor to
limit expansion and contraction
to 20 ft. for domestic
hot-water applications
Use appropriate wall
assembly per code
Expansion and
contraction: cold-water
risers
In cold-water applications, use
CTS riser clamps to support
the piping at the base of each
oor. In conjunction with the
riser clamps at the base of
each story, use a riser clamp
at the top of every fourth
story, limiting expansion and
contraction to 40 feet. A mid-
story guide is also required on
every story to guide the piping.
Uponor recommends the use
of iron pipe size (IPS) clamps
for mid-story guides as to not
restrain the piping.
Expansion and
contraction: hot-water
risers
For hot-water applications, use
CTS riser clamps at the base
of each story. In conjunction
with the riser clamps at the
base of each story, use a
riser clamp at the top of
every-other story, limiting the
expansion and contraction
of the piping to 20 ft. This
translates to a theoretical
expansion of about 1½" in 20
ft. of piping at a 70°F/38.9°C
temperature rise (installed at
70ºF/21.1ºC and a service
temperature of 140ºF/60ºC). In
this application, the piping will
snake slightly in areas where it
is not constrained. A mid-story
guide is also required on every
story to guide the piping.
Figure 6-40: Hot-water risers