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Radiant Floor System Installations
Installing radiant floor heating is a very viable heating
option when either remodeling or building new. Radiant
floor heat can also be added to an existing home easily
if the floor joists are exposed (as in an unfinished
basement). Piping may be installed in a wide variety of
configurations and locations including, but not limited
to, the following:
• In a concrete slab
• Within the subfloor system (e.g., Gyp-Crete®)
• Within the floor joist system
• Within the walls or ceilings
When installing piping between floor joists (16" or 41
cm on center) run two 1/2" pipes between each joist.
Insulate below the piping to prevent excessive heat in
the lower level.
Proper insulation is key to effective radiant heating and
controlling large heat demands. Heat from this type of
system radiates equally in all directions. As an example,
if piping is installed in a slab, the ground below the slab
must be dry and well-insulated. If not properly insulated,
nearly 50% of the heat will be wasted warming the
ground below the slab. Two inches (5 cm) of blueboard
insulation is recommended. Two 1" (2.5 cm) layers of
blueboard can be used. This allows lapping of the joints
in the 4' x 8' (122 x 244 cm) sheets.
NOTE:
Do
not
use
polystyrene), bubble foil or roll-out foam insulation.
NOTE: A minimum of one inch (2.5 cm) of
insulation should be used. Two inches (5 cm) of
insulation and vapor barrier below the insulation
is recommended.
Fig. 29
NOTE: If the temperature of the
concrete slab is below freezing
(32˚F), there must be adequate
antifreeze in the system, or the
slab must be pre-heated, before
water is circulated through the
radiant slab system.
Vapor Barrier
Slab
Insulation
Slab on grade
Wire
Mesh
2" Blueboard Styrofoam
®
is recommended (minimum
®
of 1" Blueboard Styrofoam
).
26
beadboard
(expanded
Radiant Floor Heat
(For Slab on Grade or Basement)
Hot Supply Return
Areas with high water tables need to be prepared
properly to prevent contact between the ground water
and insulation.
For examples of radiant heating systems using 1/2"
piping in the loops, refer to Fig. 29 through Fig. 32.
The spacing of each circuit is 12" (30.5 cm) between
pipes. The water circulates in opposite directions to
provide an even distribution of heat. The mixing valve
regulates the temperature of the water circulating
through the loops by mixing return water with the hot
supply water. In applications where high heat loss is
expected, loop spacing may be reduced to 10" (25 cm)
or less. If additional information is desired, contact your
dealer.
NOTE: The longer the loop length, the lower the
flow rate and the lower the heating capacity.
Loop lengths greater than 350 feet (107 m) are
not recommended.
NOTE: The temperature of the water used in
radiant heating should be determined by the
installer in accordance with the application.
NOTE: It is not uncommon that it can be very
difficult to get a concrete slab up to temperature
in late fall or early winter in a new building that
is not completely sealed and not well insulated.
Once the building is completely sealed and well
insulated, bringing the slab up to temperature
can still take a considerable amount of time and
wood; however, once warm, wood consumption
will be reduced if the concrete slab and building
are insulated properly .
NOTE: For zone installations, refer to Fig. 30
(multi-zone) or Fig. 32 (single zone).
Section 1 - Outdoor Furnace Installation
Ground
Plate
Level
Basement
Insulation
Slab
Insulation
Footing
Poly Vapor
Soil/Sand
Barrier
Insulation
Slab
Plate
Ground Level
Insulation
Poly Vapor
Barrier
Footing
Soil/Sand
© 2013 Central Boiler
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