Install Instructions

127
IM-PR 566442 1114 (Design Manual)
Figure 5-13 Cross section of insulation under concrete slab with snow melt
Concrete Slab
Foam Board Insulation:
24" min. height, 3" min.
thickness R-15
Compact Subgrade
Gravel
ViegaPEX Tubing:
Minimum ¾" height of thin-slab
over PEX tubing
Foundation Wall
Polyethylene Film:
6 mil (min.)
R-5 Insulation:
Refer to local code for insulation requirements.
(Ensure compression rating is suitable for
application.)
4"
45°
Step 2. Installing the tubing
The return bend can have a key hole shape
to minimize the tube spacing without kinking
the tubing.
Use bend supports at entry/exit points
in the thermal mass. A bend support
will help reduce possible damage to the
tubing due to the different expansion
and contraction rates of different
materials.
Figure 5-14