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Radiant as supplemental heat?

I'm proposing some radiant floor heat as a supplement for poor forced hydronic air. It would be installed between the floor joists using double groove heat plates.

However there is carpeting that already installed with padding. How do I determine the R-value of the carpet and padding.

This bedroom is part of a master suite including 2 - closets (wood floors) and a bathroom (tile floor) which will also get the same radiant install. All rooms have the same hot air. What's the best way to figure out how much radiant is needed.

The hot air is the primary heat. but is just not doing the job so I would like to use the radiant as floor warming to help. How do you determine btu's and water temp. when using 2 heating sources.


  • CMadatMe
    CMadatMe Member Posts: 3,086

    of carpet is very high. Probabluy somewhere around an r-value of 3 maybe even 4 depending on the type or pad. Be prepared for having to use some high water temps to drive the heat. A must is a floor sensor for this application.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • EricAune
    EricAune Member Posts: 432
    Consider using furnace as air handler

    I would do a heat loss for the area, you could split the load or size radiant for whole load.  The savings are going to be with the radiant either way. 

    Maybe consider using the furnace just as a filter or for humidification if needed. 

    R-values for carpet: http://www.radiantpanelassociation.org/i4a/pages/index.cfm?pageid=143
    "If you don't like change, your going to like irrelevance even less"
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