User Guide

Plumbing Design Assistance Manual l Chapter 6 – Installation methods l 75
Nominal pipe size All codes
Vertical
In wall
All pipe sizes 5 ft. (1.5 m)
Risers
Domestic
cold
water
All pipe sizes
Clamp at base of each
floor; clamp at top of
every fourth floor; provide
mid-story guide
Domestic
hot water
All pipe sizes
Clamp at base of each
floor; clamp at the top of
every-other floor; provide
mid-story guide
Heating
hot water,
chilled
water
All pipe sizes
Clamp at the base of each
floor; clamp at the top
of every floor; provide
mid-story guide
Vertical support requirements
Vertical runs of pipe fall into two categories: in
wall and risers.
In-wall piping is typically smaller in diameter
(<1"), and does not pass through multiple
stories like a riser. It is most often the dedicated
supply piping to the xture.
Riser piping is typically larger in diameter (>1")
and passes through multiple stories, often
requiring re-penetration sealants.
Note: The two categories above are not
mutually exclusive. Use best judgment when
determining which supports are necessary.
Table 6-8: Vertical support requirements for PEX pipe
Figure 6-30: In-wall versus riser piping
5'-0" (1.5m) max. 5'-0" (1.5m) max.
Floor penetration
Riser clamp
Uponor PEX riser
Mid-story guide
Stud
Floor penetration
Uponor PEX
in-wall piping
Support bracket