Onix Tubing Installation Manual

Watts Radiant: Onix Installation Manual page 39
Consult with the project manager or
concrete installer to make sure this
depth is appropriate.
Complete encapsulation of the tubing
is required to prevent stress points
from forming on the slab, which may
accelerate cracking over time.
Installation Steps
Manifold locations, final concrete
thickness and zoning details are just a
few items that are required for a suc-
cessful radiant slab installation. The
following guidelines and examples
cover the most common installation
conditions. If your situation is not cov-
ered here or if unexpected circum-
stances arise, please contact Watts
Radiant or a Watts Radiant
Representative.
The most common installation pattern
for slab applications is a double ser-
pentine layout, although in some cases
a single serpentine may be used.
Step 1:
Pre-Pour Conditions
Verify all subgrade conditions are
properly prepared, all insulation is
installed according to design condi-
tions and rewire or rebar is in place.
With orange spray paint, locate all
interior walls and other obstacles that
may need to be avoided, such as toilet
areas, sewer drains, and any structural
supports that may penetrate the slab.
Step 2:
Install Manifolds
Locate where the manifolds are to be
installed. Drive two pieces of rebar
vertically into the ground at this loca-
tion. With the use of cable ties or elec-
trical tape, temporarily secure the
manifolds to the rebar. Remember to
keep the manifolds high enough to
allow for the thickness of the concrete,
the interior wall base plate and other
structural items that may need to be
installed after the pour.
Secure manifolds to
rebar or other support
Unwind the Onix to form a
loop and attach ends to the
manifolds
Lay Onix across slab area,
keeping tubing spaced to
design conditions.
Secure Onix every 18” on
center to the rewire or rebar.
Concrete Slab
Typical slab installation. Onix is installed using a double serpentine pattern.
Vertical Edge insulation is
required along all exposed
sides of the slab.
Horizontal Insulation should be
installed under the entire slab
for optimum performance. For
commercial and some residen-
tial applications, horizontal insu-
lation can be limited to the
exposed perimeter.