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gypcrete vs light weight concreter for overpour rfh

doug_10
doug_10 Member Posts: 102
in THE MAIN WALL
I am trying to find an article I read by Segenthaler regarding the problems with using light weight concrete for overpouring radiant floor heating. Does anyone remember the key points or where I can find the article?

Comments

  • keith
    keith Member Posts: 224
    John's Article

    Is in the January Plumbing & Mechanical issue.
  • Steve Ebels
    Steve Ebels Member Posts: 904
    Gyp is

    A lot less likely to crack. I've seen two lightweight concrete jobs that "moved" after a period of a year or two. Both were over nice dry basements and had ceramic tile on top. They had both cracked and also for lack of a better word, heaved. The tile was level when installed and had risen or sunk as much as 1/4" compared to the tile directly adjacent. Weird, I have no idea what could have caused it. There were no moisture issues in either home. All the cracks were on grout lines of the tile.
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