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Designing a new radiant &hydro-coil system

Sam G.
Sam G. Member Posts: 12
I am involved in a project that involves ripping out a very old scortched air furnace and installing a hydronic boiler combining a staple-up zone (wood then thinset tile), 1 baseboard zone, and 1 hydronic coil in a air handler/duct zone. Total house heatloss of under 100,000BTU/hr.It has been a few years since my last radiant system. (I did read Dan's radiant book last night).

A few questions to current installers:
My supply house recommends loose stapling leaving air gap between tubing and floor. Does this make sense? Should I use heat transfer plates?

Heatway Vs. Wirsbo?

Is double sided foil faced bubble wrap insulation sufficient?

Thank You Sam (Heat Jockey)


  • Dana
    Dana Member Posts: 126

    All of your questions are job specific and would be answered during the design phase. Go to www.wirsbo.com, they have a fairly good site. I'm sure they would be happy to send you out a design brochure and/or answer questions.
  • Mark A. Custis
    Mark A. Custis Member Posts: 247
    Last combo job

    I used ROTH AL plates srewed to the sub floor, hammered in the pex, then r-19 glass insulation. First Co. DX cooling. Boiler and controls by Veissman and Arzel.

    I do lick the wirsbro site and will use them soon.


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  • Bruce_9
    Bruce_9 Member Posts: 6

    The more insulation underneath your heat the better. I've heard four times the R-value of what's above as a rule of thumb, definitely foil-faced toward the heat. It makes a nice cozy little spot for small critters to move into so be careful in crawl spaces.
  • Marc Sherby
    Marc Sherby Member Posts: 11

    Onix tubing by WattsRadiant (ex Heatway) is the most installation friendly and give excellent performance for staple up jobs. You won't need the plates with the onix. Leave about a 2" air space between the tubing and the foil faced insulation or the floors performance will be diminished.
  • HeatJockey
    HeatJockey Member Posts: 37

  • HeatJockey
    HeatJockey Member Posts: 37

This discussion has been closed.