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Radiant tubes in a concrete/mud slab vs mounting the tubes under the sub floor.

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Posted by spam on June 4, 2007, 3:59 am
 
Radiant tubes in a concrete/mud slab vs mounting the tubes under the
sub floor.

I am building a new home and I will be installing radiant heat.
Should I install the tubes on the sub floor then pour concrete/mud
over the tubes or should I install the tubes under the sub floor
between the joists. What are the pros & cons of each?  Is it worth the
extra expense to pour the concrete?  It is not an issue of weight on
the floors. The floors were designed to carry the weight of the
concrete.  I am looking for comfort and efficiency once I am using the
system.


Posted by Ecnerwal on June 4, 2007, 11:52 am
 
 spam@joyce.ws wrote:


Putting the tubes in the slab on top of the sub-floor reduces the
thermal resistance from tube to building in a (typically, when it's all
added up) cost and labor-effective manner. Putting them under the
sub-floor is more typically done in retro-fit installations where a slab
is not an option, and typically requires both aluminum plates to be
formed and installed (cost, and labor cost) to help spread the heat, and
higher water temperatures in the loop due to higher thermal resistance
despite the "heat spreaders". If there's a solar component to the
heating system, the higher temperatures drastically affect heat
collection efficiency (a hotter collector is less efficient than a
cooler one - more losses back to the world) - if it's fuel driven only,
not so much.

--
Cats, coffee, chocolate...vices to live by

Posted by AstickfortheMULE on June 7, 2007, 3:49 am
 I HAVE NEW CONSTRUCTION, 100% SIPS WALLS AND ROOF ONTOP OF ICF
BASEMENT AND 2" BLUE FOAM UNDER SLAB.

IF I WERE TO DO IT AGAIN, I WOULD AGAIN PUT IN SLAB IN BASEMENT AND
POUR SELF LEVELING CONCRETE ON FIRST FLOOR AND SKIP THE FLOORS
ABOVE.  BIT WE DO LIVE IN MILD SEATTLE.

ACTUALLY I WOULD PURCHASE RADIANT PANELS FROM WWW.ERNEGIE-SOLAIRE.COM
FOR BOTH HEATING AND COOLING.  THEY GO ON THE CEILING AND YOU CAN HEAT
AND COOL WITH MILD TEMPERATURES.

DO NOT STAPLE UP.  PAIN IN THE ARSE AND PRONE TO ALL SORTS OF
PROBLEMS.

DRILLING IN TGI'S IS THE WORST THING A PERSON CAN DO.

ERIC


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