Page 18
Zurn PEX
®
Plumbing Installation Guide
ZURN PEX, INC.
HIGHWAY 11 EAST, COMMERCE, TEXAS, U.S.A. 75428 • PHONE: 855-ONE-ZURN (855-663-9876) • FAX: 903-886-2583 • www.zurn.com
Before You Start
Applications
Check local code requirements prior to installation.
Note:
Follow Installation Precautions when installing a Zurn PEX system.
Inspection
Contaminated Soil
The soil in the area of installation must first be inspected and
determined to be free of contaminants such as organic solvents
and petroleum distillates. Zurn PEX tube is not recommended for
underground use in areas of known soil contamination or where
there is a high risk of chemical spills. Zurn PEX should not come
into contact with soil near hazardous waste disposal sites or
underground chemical or petroleum storage tanks.
Tubing
All pipe should be inspected prior to installation. Any areas
that have sustained damaged in the form of cuts, punctures,
or excessive abrasion as well as areas where the pipe has
been kinked or pinched must be cut out.
Preparation
Trench Bottom Preparation
When Zurn PEX tubing is to be buried during installation, it is
essential that the supporting soil provide a stable and permanent
support for the pipe. For buried tubing subjected to heavy overhead
traffic a minimum cover of 24 inches is recommended. If light
overhead traffic is anticipated, a cover of 12-18 inches is
recommended.
Important:
Do not use blocking to support Zurn PEX tubing or
change the tubing grade. Do not install Zurn PEX tubing in, under,
or above septic tanks, septic tank drainage fields, pits, or cesspools.
In Good Soil Conditions:
Zurn PEX tubing can be installed directly on the prepared bottom.
The bottom must be flat with no hollows, no lumps, no rocks, and
no other sharp objects as they could damage the tubing.
Figure 1
Water Service Installation
Substandard tube performance may result if these instructions are not followed.
In Loose, Rocky Soil Conditions:
The trench should be excavated at least 6” deeper than the
desired pipe depth and filled with suitable soils such as coarse
sand or peagravel.
In Solid Rock Conditions:
The trench should be excavated at least 6” deeper than the desired
pipe depth and filled with graded, tamped granular Class I material.
The material should not be so fine as to wash out and cause
subsequent settling of the tubing onto the solid rock.
In Unstable Soil Conditions:
The trench should be excavated at least 4” deeper than the desired
pipe depth and filled with suitable soils such as coarse sand or
peagravel.
Installation
Thermal Expansion and Contraction
The linear expansion rate for Zurn PEX is approximately one inch
per 100 feet of tubing for every 10°F change in room temperature.
When installing Zurn PEX tubing, add 1/8” per running foot to
accommodate thermal expansion or about 13 inches per 100 foot
run. Snake the pipe uniformly along the trench. See Figure 2.
Water Main
Cross-Section
Pipe
Figure 2
Ground Level
Desired
Pipe Depth
Good Soil
Loose, Rocky Soil
Solid Rock
Unstable Soil (Black Gumbo)
6
6
4
