Install Instructions

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IM-PR 566442 1114 (Design Manual)
3.3 Heating and cooling load calculations
For large commercial jobs, Viega assumes that the
HVAC contractor has familiarity with conducting
heating and cooling load calculations. When
conducting a heating or cooling load calculation
for a commercial space, incorporate the following
ancillary loads and considerations as necessary:
• Ventilation air requirements – may vary with
occupancy
• Infiltration and air tightness – construction
details and operation of the building (e.g.,
regular opening of large bay doors) will
impact sensible and latent loads
• Lighting – generally accounted for in heat
load calculations, but consider impact
of daylighting controls and interaction of
skylights and other fenestration
• Equipment – refrigeration cases, cooking
equipment, large compressors, industrial
machinery, etc.
• Regular storage of hot or cold items
• Occupants
• Surfaces – because the transfer of radiant
heat between surfaces is impacted by
the emissivity of the surfaces, less heat
will transfer between a radiant panel (e.g.,
radiant-heated floor) and a ceiling with a
low emissivity coating. Advantages and
disadvantages of varying surface emissivity
can be explored through building energy
simulations.
3.4 Installation methods
In general, commercial installation methods are
similar to residential, when specifying ViegaPEX
Barrier or FostaPEX for use with Climate Panel
(top of subfloor and walls), Climate Trak (below
subfloor), Snap Panel (in-slab), or simply laying
and tying tubing to reinforcements within a
slab. Complete installation instructions for these
methods can be found in Appendices A, B and C.
Commercial installations may involve
post-tension slabs, standard slabs or slabs on
a suspended deck. Special considerations for
installing radiant tubing in each of these scenarios
are given in Table 3-4.
Installation Type Considerations
Post-tension Slab
• Minimum of ¾" concrete over tubing
• The closer the tubing to the surface, the lower the water temperature for a
given surface temperature
• Must coordinate with tightening tendons (cables)
• Tightening tendons should be sheathed and not in direct contact with tubing
Standard Slab
• Generally secured to rigid board insulation with foam staples
• Zip-tie to wire mesh
• Minimum of ¾" concrete over tubing
• The closer the tubing to the surface, the lower the water temperature for a
given surface temperature
• Zip-tied to rebar layer closest to the surface unless dictated otherwise by
structural design
Suspended Deck
• Zip-tie to wire mesh
• Minimum of ¾" concrete over tubing
• The closer the tubing to the surface, the lower the water temperature for a
given surface temperature
• Insulation below tubing (above or below deck)
Table 3-4 Considerations for installation of radiant tubing in commercial slabs