Install Instructions

Water Service Installation
37 of 88
IM-PF 724596 1021 PureFlow Water System (EN)
Concrete
6"
min.
Haunching
Bedding
Compact
Initial
Back󶈵ll
Back󶈵ll material must be free of large rocks, glass, or other sharp objects.
Provide su󶈷cient coverage over tubing so that expected tra󶈷c loads will
not deform tubing (consult local codes). Compact this material to at least
6" above the tube.
Do not install Viega PureFlow PEX tubing where soil is or may become
contaminated with solvents, fuels or similar chemicals. Do not install
tubing above or below septic tanks, leach 󶈵elds, pits, or cesspools.
Always follow local codes when installing Viega PureFlow PEX tubing.
Consult standards such as ASTM D2774: Standard Recommended
Practice for Underground Installation of Thermoplastic Pressure Piping for
further information.
7.2 Foundation Penetration
Where service lines penetrate foundation or basement walls, to prevent
shearing or pinching o󶈴 of the tube when back󶈵ll below the tubing settles,
plastic tubing must be properly sleeved.
If there is an area of over-excavation through which the tubing must pass,
it shall be sleeved with a larger rigid pipe (Schedule 40 PVC or equivalent)
to undisturbed earth. The foundation end of the rigid pipe must also be
supported by the foundation wall.
Slight over-excavations (12" or less) do not require rigid sleeving when
the area below the tubing is back-󶈵lled and well compacted to the level
of penetration. Always sleeve plastic tubing where it passes through
concrete. Do not use oil-based caulks or sealants in contact with tubing.
Sleeve to undisturbed
earth with rigid pipe.
7.3 Direct Burial of Viega PureFlow Fittings
Installing PureFlow 󶈵ttings in direct contact with ground soil (direct
burial) may require protective measures. Refer to the below direct burial
requirements for each 󶈵tting type.
Viega PureFlow Press 󶈵ttings (zero lead bronze and polymer) do not
require any protective wrap for direct burial installations.
Viega PureFlow Crimp 󶈵ttings (Eco Brass and polymer) and their crimp
rings shall be securely wrapped with tape meeting the following criteria
for direct burial installations:
■ Self-fusing
■ Formaldehyde-free
■ Fully cured silicone tape
■ Minimum of 0.020" thickness
The wrap is available from Viega (part number 15320).