Install Instructions

IM-PR 566442 1114 (Design Manual)
126
Calculating number of circuits:
Total amount of tubing ÷ maximum circuit length =
# of circuits
Serpentine
Used in level I and II applications
Figure 5-12a
Reverse return
Level I and II optional, recommended for Level III
applications.
This pattern distributes heat more evenly and allows
a lower thermal stress than a serpentine pattern.
The reverse return installation procedure is more
difficult and more time consuming than that of the
serpentine pattern.
When the tubing is installed within concrete,
minimize penetration of joints. Any tubing that
passes through expansion joints must be protected
with protection sleeve for a minimum of 6" (15 cm)
on both sides of the joint.
5.12.3 Installation
Step 1. Installing the Insulation
Insulation improves a snow melting system by
decreasing the system’s response time, downward
heat loss and energy costs. When using foam
board to insulate under slabs, weigh down the
boards to prevent wind uplift. In some jobs this can
be done by installing wire mesh as soon as foam
boards are placed.
• Final grade should be accurately leveled.
• Cover grade with a polyethylene film (6 mil.
minimum). This step is not recommended for
paver or other porous surface applications.
• Install minimum R-5 insulation rated for
required compressive strength and moisture
resistance. Check local codes for additional
requirements. NOTE: Outside of the heated
surface area, insulate all supply and return
lines with pipe insulation.
Figure 5-12b
(CSA B214, Clause 17.4.4.2)
The tubing at the location of a control,
expansion or construction joint in a concrete
slab shall be protected by
(a) a rigid sleeving material that covers the
tubing for at least 300 mm (12 in) on either
side of the joint;
or
(b) dipping the tubing below the slab.
Tubing installed below control joints in concrete
slabs shall be secured at points 150 mm (5 in)
on each side of the control joint.
Insulation
(CSA B214, Clause 17.4.4.4)
When a poured concrete snow melt system
is installed in contact with the soil, insulation
that complies with Clause 14.4.4.3 and has a
minimum RSI value of 0.9 m
2
•K/W (R-value of 5
h•ft
2
•°F/Btu) shall
(a) be placed between the concrete and the
compacted grade;
(b) extend as close as practical to the outside
edges of the concrete; and
(c) be placed on all vertical slab edges that
are in contact with plants or landscaping.
39
39. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Clauses 17.4.4.2, 17.4.4.4
5.12.4 Slab joint tube protection