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radiant system

Nick_16 Member Posts: 79
Hi. I don't know much about the radiant in-the-floor heat. I am used to fin/tube baseboard. Would the in-the-floor heat work OK through 1/2" floor, 1/2" carpet pad, and 7/8" carpet. I would want to "retrofit" it under the joists. Also, what would work better, just staple-up or using the heat transfer plates? Thank you!


  • hr
    hr Member Posts: 6,106
    You're asking a lot :)

    that floor assembly and covering equals about an R-4.6. Depending on what kind of heat load you have, don't expect much output with that much insulation on top.

    With 140° supply, about max. for most plywood contact, expect about 12- 14 BTU/ square foot output, according to the RPA RadPad.

    How is it you have only a 1/2" plywood subfloor. Seems thin, unless your joist are on 8" centers :)

    hot rod

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