User Guide

Installing PureFlow Systems
40
PG-PF 724998 0320 PureFlow System
Supporting PureFlow PEX Tubing
Use only plastic or plastic-coated tubing
supports. Metal supports may damage tubing.
When running tubing, leave a small
amount of slack between fasteners to
account for tubing contraction.
Note that Viega PureFlow PEX tubing will
expand or contract 1.1" per 100 feet for
every 10°F of temperature change. In long
straight runs, allow adequate clearance for
this (see “Tubing Expansion” on page 45).
The aluminum layer in FostaPEX reduces
expansion and contraction, so that it expands
only 0.16" per 100 feet for every 10°F of
temperature change. This makes it ideal for
locations where expansion must be minimized.
Tubing should be allowed freedom to move
slightly as it expands. Do not clip it tightly
into place or locate it where it will be tightly
constrained. Use suspension clips or an
approved plastic insulator where tubing
passes through studs or joists where
abrasion and noise are a concern.
Suspension clips support tubing
in joist penetrations or anywhere
abrasion is a concern.
In risers or vertical runs, Viega PureFlow PEX
and FostaPEX tubing should be attached
with suspension clips or an approved plastic
insulator at each 󶈶oor or ceiling penetration,
and every four feet in between.
Suspension clip fasteners used at floor plate
Viega PureFlow PEX tubing must be fastened
at a minimum interval noted in the table
below for vertical and horizontal support.
PEX Size Horizontal Vertical
Viega
PureFlow
PEX
½" - 1" 32" O.C. Base
of each
󶈶oor with
midlevel
guide
1¼" - 2" 48" O.C.
FostaPEX
½" - 1" 32" O.C.
PEX Support
Tubing supported with U-clip or lock clip
fasteners on horizontal runs
Spacing per PEX
Support Table
J-clamp or lock clip fasteners used to
support tubing in vertical runs between floors
Midlevel
Guide
WARNING!
Some model codes may
allow greater support spacing
intervals for plastic tubing.
Always refer to local code for approved
spacing requirements that exceed the
ones referenced in this guide.