Click here to Find a Contractor in your area.
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit


MancaveMancave Member Posts: 5
Any Pros or Cons about Pouring a thin slab over an existing slab for in floor radiant heat? And any input about fastening pex to concrete! Could use some HELP on this one my friends.tkx Mancave...


  • Al CorelliAl Corelli Member Posts: 395

    Is the existing slab insulated?
    Al Corelli, NY

  • joseph annonjoseph annon Member Posts: 33
    Anchoring pex to floor

    On a remodel we drilled anchors into old floor and set anchors use single hole galvanized clamps every couple of feet. I don't remember how thick the finish slab was but not much more 2 inches. No problems with floor.
  • Mark EathertonMark Eatherton Member Posts: 5,582
    If you are going to go to that kind of trouble....

    Maybe you should consider using WarmBoard R panel. It was designed with retrofit in mind, and will give a small thermal break between the existing slab and the new heat emitting panel.

    It will also perform well with much lower water temperatures than will gypcrete or concrete.

    Getting some kind of thermal break between the old slab and the new emitter is critical to overall efficiency, especially if the existing slab is without insulation.

    Alternately, consider radiant ceilings using the same R panel. When it is on, the floor is NOT cold.

    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • MancaveMancave Member Posts: 5
    Radiant in concrete

    Yes it is!
  • MancaveMancave Member Posts: 5
    Radiant in concrete

    Yes it is!
  • MancaveMancave Member Posts: 5
    Radiant in concrete

    Tkx i will pass that on !
  • Tim P.Tim P. Member Posts: 50
    Why not use WWM

    If you are going to pour over the existing, why now lay down some welded wire mesh (preferably the mats, not the rolled stuff) to use as a grid for fastening the pex.

    I'm not sure what steel mats are costing these days, so it may not be feasible.

    Otherwise I would be thinking about something using a powder actuated fastener.  Or maybe Viega snap panels.. or warmboard as mentioned earlier.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!