insulate concrete basement floor

Discussion in 'Insulation and Radiant Barriers' started by danboston, Apr 3, 2011.

  1. Apr 3, 2011 #1

    danboston

    danboston

    danboston

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    I am remodeling my basement and want to insulate the concrete floor. I have about 2.5" of headroom that I can steal for insulating the floor. What si the best method for insulating the floor?
     
  2. Apr 5, 2011 #2

    joecaption

    joecaption

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    I use blue foam insulation with Advantec over that, Tap Coned to the slab with 3" long screws. Worked great and there's 0 movement of the subflooring.
     
  3. Apr 8, 2011 #3

    danboston

    danboston

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    Great, I checked out the Advantek web-site. It looks good. I do plan to put in a bathrrom in the basement and wanted to tile over the insulated floor. Somone else said I should use Ditra board over the foam board insulation. Should I put the Advantek down first and then the Ditra board over that?
     
  4. Sep 14, 2011 #4

    carolinacustomkb

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    I would probably subfloor the entire basement. If the subfloor is sound and you don't need waterproofing, then you don't need Ditra...you would use a backer of your choice. Thin set it down and screw it to the subfloor.

    Installing plywood over the entire floor will also eliminate any floor height differences. 1/4" backer with a 5/16" thick tile should flush out really well.
     
    Last edited: Sep 14, 2011
  5. Sep 20, 2011 #5

    Perry525

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    If you are using floor grade Styrofoam, you should go for a fully floating floor. If you use metal screws, each screw provides a heat bridge to pass your heat to the concrete slab, nullifying the point of insulating.
    A fully floating tongued and grooved waterproof plywood floor is best.
    Is your floor always dry? What about the walls? Are they dry?
     

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