Install Instructions

www.uponorpro.com
28
Bad Soil Conditions
If installing in rocky, clay, muddy or other
poor soil conditions, it may be necessary
to prepare the trench bottom using
granular material of such size and grading
to provide a stable base. See your local
code for additional requirements.
Installation
Install Uponor AquaPEX tubing
underground in a manner that avoids
damage caused by external loads.
External loads should not cause a
decrease in the vertical dimension of the
tubing cross-section more than 5% of
the outside diameter. To ensure proper
underground installation:
• Install Uponor AquaPEX tubing in a
snaking pattern with sufficient slack in
the line to allow for contraction of the
line due to temperature change prior
to backfilling.
• The linear expansion rate for Uponor
AquaPEX tubing is approximately 1.1"
per 10°F (5.6°C) temperature change
for every 100' of tubing.
• Do not use blocking to support the
tubing or change the tubing grade.
• Do not install potable water service
tubing in, under or above cesspools,
septic tanks, septic tank drainage
fields or pits.
AquaPEX Tubing
Desired Tubing
Excavation
Level
Fill Level
Elevation
Minimum 24" for
Vehicular Traffic
Figure 4-2: Trench Example of Bad Surrounding Soil