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radiant underlayment foamboard

bob eck
bob eck Member Posts: 930
I have a customer who is going to install radiant tubing in a sunroom on top of a concrete floor.

He is looking at using a underlayment foamboard with a aluminum heat shield and put the tubing in the foamboard.
Then install tile right on top of the foamboard.

Does anyone know of this type of product?

Thanks Bob


  • Will Merryman
    Will Merryman Member Posts: 32
    Check out

    Wedi board. Also check out Bekotec for tubing placement.Control joints not needed as well as controlled cracking.Schluter (Bekotec) recommends 4" foam under tubing on concrete. Go to Schluter.com
  • hot_rod
    hot_rod Member Posts: 21,840
    Is there insulation

    under the current slab. If not it would be nice to get 1-1/2 to 2" before putting the tube down.

    Sometimes that is not do-able with doors and elevations. Roth has a 5/8" foamboard with aluminum cover and grooves 6" on center that would be an option. I suspect you would still need a cementious backerboard over that for the tile installation.

    If it is a sunroom with mostly glass maybe do some heatload calcs first. it may not pencil out well to try and heat a space like that?r

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
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