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question re thermal-board--Bill Clinton

Bill Clinton
Bill Clinton Member Posts: 75
We just installed 3,000 square feet of thermal board with tube. (Tried to switch to Warm Board, but no dice.) Install went ok, but the customer is wanting to turn the heat on before the hardwood floor goes down. Certainly a reasonable request, but when that tube starts expanding with temperature change, is it going to jump out of the grooves. Yes, there is some silicone in there to glue it down, but will it work, or are we going to have 4000 feet of 3/8" snakes writhing around the floor? Anybody got experience here? Thanks.



  • Mark Hunt
    Mark Hunt Member Posts: 4,909

    Haven't had that particular experience but....

    if you keep the temps low enough, there shouldn't be a problem.

    I can't imagine that with the warm weather you would have to run them up that high.


    Mark H

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  • hr
    hr Member Posts: 6,106
    A good chance

    I have seen a video clip of the Watts 862 product being fired up. In their system the tube lies unattached in a 2" wide space between the plywood strips.

    When the hot water hits the tube the pex looks like a big snake that has started to move.

    The pex really moves and moves quickly, pretty amazing to watch!

    I have, however run several of my Warmboard jobs without coverings. It depends on how well you silicone the tube.

    With thermal board I would worry how well that aluminum foil layer is attacked to the board, that seems to be the weak link.

    Another word of advise, keep the board dry it swells when wet!

    hot rod

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