PEX Installation

47
IM-PF 724596 0416
16.3 Supporting ViegaPEX Ultra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 ViegaPEX Ultra tubing will expand or contract
1.1" per 100' for every 10°F of temperature change.
Inlong straight runs, allow adequate clearance for
this. (See “16.9 Tubing expansion” on Page 48.) The
aluminum layer in FostaPEX reduces expansion and
contraction, so that it expands only 0.16" per 100' 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 is a concern. (See illustrations to right.)
ViegaPEX Ultra tubing must be fastened at a minimum
interval noted in the table below for vertical and
horizontal support.
Suspension clips support tubing in joist penetrations
or anywhere abrasion is a concern.
In risers or vertical runs, ViegaPEX Ultra 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 (see below).
Tubing supported with U-clip or lock clip fasteners on
horizontal runs
Suspension clip fasteners used at floor plate
J-clamp or lock clip fasteners used to support tubing
in vertical runs between floors
Midlevel
Guide
Spacing per
Table 16.1
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 manual.
Table 16.1 PEX Support
PEX Size Horizontal Vertical
ViegaPEX
Ultra
½" - 1" 32" O.C. Base of each
oor with
mid-level
guide
1¼" - 2" 48" O.C.
FostaPEX ½" - 1" 32" O.C.