User Guide

Installing PureFlow Systems
51
PG-PF 724998 0320 PureFlow System
Viega PureFlow PEX tubing
Viega plastic bend
support or
corrugated tube
Attach tubing to wire mesh
or rebar with zip ties
Wire mesh or rebar
4" to 6" cement slab
PEX in slab
Elbow sleeves protect tubing at
concrete slab penetrations
Sleeving Requirements
All penetration points of Viega PureFlow
PEX tubing run within concrete slabs or
walls (entry/exit points, expansion joints,
etc.) must be sleeved to protect the tubing
from expansion and contraction. Sleeving
may consist of a larger piece of plastic
tubing or open- or closed-cell insulation with
a wall thickness no less than 0.022" thick.
Where sleeves are used, they shall
be securely fastened to the assembly
penetrated. Insulation and covering on or in
the penetrating item shall not penetrate the
assembly unless speci󶈵c material used has
been tested as part of the assembly.
Viega PureFlow PEX tubing can be installed
within concrete slabs. Best practice dictates
that only continuous lengths of tubing
should be run within the slab. Viega does not
recommend the installation of 󶈵ttings within a
slab as part of a design. Fittings should only
be used in a slab if it is necessary to make a
repair. If the use of 󶈵ttings buried in concrete
is necessary for repairs, all such 󶈵ttings must
be wrapped with insulation, noncorrosive
tape (no adhesives) or sleeved to prevent
corrosion. The wrap shall be a self-fusing,
formaldehyde-free, fully cured silicone tape
with a minimum of 0.020" thickness. The wrap
is available from Viega (part number 15320).
Contact a Viega representative for additional
information on approved wrapping materials.
When running tubing within a concrete slab, the
tubing must be fastened to the reinforcing mesh
or rebar every two to three feet to prevent it
from 󶈶oating up while concrete is curing.
Tubing must be fastened to the reinforcing
mesh on rebar with the use of plastic zip ties
Viega o󶈴ers corrugated sleeved PEX
for additional underground or in-slab
protection. This allows for easy removal
and replacement if future issues arise.
PureFlow PEX Tubing Installed in Slab