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Subject:  Re: Radiant Heat System Date:  1/7/2004  11:53 AM
Author:  ogrecat Number:  44346 of 134947

Recall that insulation works by trapping air. When you install radiant heating tubing in free air, there is no good conduction medium, since air is more of an thermal insulator than a conductor. Concrete, however, is a good thermal conductor - which is why radiant heating is so effective in concrete floors.

You might be able to fill the floor cavities with something to improve the heat transfer, and that might make your radiant heat work better. However, I'm not sure what you could use to fill the cavities that would be effective and practical.

I think I read somewhere that you can seal the floor cavity and insulate/put something reflective on the bottom.
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