Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Overpour Thickness on existing slab

Jim_12
Jim_12 Member Posts: 7
in THE MAIN WALL
What has been your experience in adding a radiant heat overpour to an existing slab floor? What is the minimum thickness you have seen that was both cost effective and heating efficient? Considering this and wondering if I'm out of my mind.

Comments

  • Troy_3
    Troy_3 Member Posts: 479
    overpour

    We insulate with 1"polystyrene, tube and pour 1-1/2" gypsum concrete over the top. That makes a 2-1/2" over all thickness.
  • Dave Gulbranson
    Dave Gulbranson Member Posts: 10
    1 1/2\"

    We insulate the slab with 1/4" bubble foil insulation- make sure it's the stuff you can pour over. Then we attach pex rails to hold down the tubing. The slab thickness is about 1 1/2" of gypcrete. Our gypcrete guys dont have any problems with the insulation-they sell aversion of it themselves. You have to make sure the tubing is really held down good-use alot of rails.
  • kevin_5
    kevin_5 Member Posts: 308
    Do I HAVE to use gyp-crete?

    I am looking at an overpour job in a rural area that is about 4 hours one way from the nearest gyp-crete contractor. This is only about 160 square feet too.
    How thick would regular concrete have to be to avoid cracking? Weight is not an issue here, and we plan to use "low-e" brand foam/foil/foam 3/8" thick. By the way I like your pex rail idea. Thanks, Kevin

    To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor"
This discussion has been closed.

Categories