Onix Tubing Installation Manual

Commercial applications require spe-
cial design considerations and flexibil-
ity. This is especially true when
designing and installing a radiant floor
over a steel deck or precast concrete
floor.
Steel Deck
Steel decks are usually seen in office
mezzanines and other areas that will
experience light to moderate loads.
There are several different types of
steel decks, ranging from 2’’ angle
channels to 6’’ square channels. These
channels will play a part in determin-
ing what Onix spacing should be used.
When possible, install the Onix per-
pendicular to the ribbing on the steel
deck. There is only one area a steel
deck application can be insulated, that
being under the steel deck. In this con-
figuration, it is almost impossible to
insulated under a steel deck system
with batt insulation, since the support
members tend to be farther apart than
the typical 16’’ o.c.
In most slabs, rewire or rebar will be
used, giving the installer a way to
secure the Onix. In some applications
fiberglass mesh will be used instead of
rewire/rebar. In this case Railways
may be used.
Precast Slabs
Precast slabs are similar to a steel deck
application with the exception of the
main support layer. The precast slab is
designed, in most cases to be the floor
support of the level above and the fin-
ished ceiling for the level below.
Because of this it is difficult to insu-
late a precast slab system. Insulation
options need to be discussed with the
project engineer or architect.
Likewise, rewire/rebar may or may not
be used in the cap pour. Fastener
types are chosen based on the
approved construction requirements.
page 48 Watts Radiant: Onix Installation Manual
Steel Decks
Rewire/Rebar
Railway
Cable Tie
ClipTie
Various tube fasteners for steel deck slab applications.
Concrete
Steel Deck
Insulation
Electrical Chase
Onix
Rewire/
Rebar
Concrete Cap
Precast Concrete
Electrical Chase
Onix
Typical Slab over Steel Deck application. Insulation board is usually installed below the steel deck,
minimum 1” thick.
Typical Slab over Precast application. Insulation location and fasteners are variables depending on
the structural requirements of the total mass. Consult with the structural engineer before choosing
an insulation or fastening method.