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.

My first Crete-Heat job

Rod, what do you know about EPS under slabs?

I've heard murmuring about expanded foam not handling moisture very well, but I haven't seen anything to confirm or deny that. I know we've always specified extruded, not expanded polystyrene, but I'm open to options.

any good info on this? Cause it does look like a cool product for sure.


  • hot_rod
    hot_rod Member Posts: 22,109
    and I'm a believer

    this is a 900 square foot Habitat for Humanity job.

    Crete-Heat donated the panels, Watts Radiant the Onix and manifolds. I'm doing the work Caleffi is offering a Solar Pump Station for the SDHW. A fun LEEDS project involving the a local Drury college architectural class.

    The panel went down in about 1.5 hours, and less that that to walk in the tube.

    What a joy to not have to handle rusty old mesh and finger filing zip ties.

    I'll do a 3200 square footer in a week or so also.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • tim smith
    tim smith Member Posts: 2,752
    Crete heat

    I saw that product a while ago and found it quite interesting. Do the wire the rebar over the top then after tube lay out. ??? Tim
  • hot_rod
    hot_rod Member Posts: 22,109
    It could have

    mesh or rebar placed over the top. This job will have fiber blended in the concrete instead of rebar of wire. fairly common to do it that way around here.

    The posts on the Crete-Heat would hold the bar or mesh up into the pour very well. So often on plain foamboard it lies at the bottom of the pour doing little., if any good.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Scott OB
    Scott OB Member Posts: 22
    I believe

    Did a 900 sq ft garage recently.Was fun putting the tubing in.It was poured with fiber mesh concrete.Don Regan from Crete Heat wanted to come look at the job but I was away at the time.Great company,great product!!
  • jp_2
    jp_2 Member Posts: 1,935
    what tubing?

    that looks like flat tubing hot rod? what kind is it?

    looking like it would be easy to trip and pull up tubing?

    looks good though :)
  • Don Regan
    Don Regan Member Posts: 43
    Closed cell foam...

    does not take on moisture. Your getting todays EPS confused with yesterdays bead board. www.epsmolders.org

    Remember the last time you had a hot cup of coffee or hot chocolate from a white beaded cup. Did it drip? Did your fish box or beer cooler leak? What's in most boats made today to keep them afloat? They would never use EPS in these products if it took on water. Personal watercraft are filled with EPS so they don't take on water if submersed.

    Thanks for asking. :)
  • Dale_14
    Dale_14 Member Posts: 1
    water heater

    I have a radiant system using a water heater. Wondering if i put a loop to my furnace with a heat exchanger if i would benifit. If so where would i find one
  • Weezbo
    Weezbo Member Posts: 6,232
    Very nice looking install. *~/:)

    This is a sharp product....i have looked for a long time to find something like this....

    quietly the wheels of time turn :)
  • hot_rod
    hot_rod Member Posts: 22,109
    This tube is

    Watts Radiant Onix, 3/8" A very tight fit. I doubt it will float or snag on boots. it lies very flat to the board.

    My next install 3200 square feet will be with Viega 1/2' fostaPex. I'm anxious to see how the tube installs compare.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Ron Gillen
    Ron Gillen Member Posts: 124

    Beaver Plastics makes a similar product and distributes throughout North America. A real time saver on installs. http://www.beaverplastics.com/beavercurrent/insulworks.html

  • good to "see" you again don ;) I did some more poking and I now see the light, thanks!
  • jp_2
    jp_2 Member Posts: 1,935

    main menu and post your question. off hand the answer is no, standard water heaters are only about 70-75% efficient, if your furnace is lower best bet is to upgrade your furnace.
    and keep your radiant separated from you shower water!
  • Richard_6
    Richard_6 Member Posts: 22
    More Pictures???

    I'm looking for more install photos if anyone has some.

    Thanks, Don
  • Ron Gillen
    Ron Gillen Member Posts: 124
    more on their site

    If you haven't already looked Crete-Heat has pictures on their site. http://www.crete-heat.com/pictures.html
This discussion has been closed.