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icynene under radiant floor

Mr. Blonde
Mr. Blonde Member Posts: 38
in THE MAIN WALL
a post on icynene sprayed or poured under a radiant slab instead of 2" high density foam. Has anyone done this or heard of it?

Comments

  • Paul Pollets
    Paul Pollets Member Posts: 3,663
    Not practical

    Foam is sprayed on the walls, not under the slab. R10 blue or pink board is used.

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  • Ron Schroeder
    Ron Schroeder Member Posts: 998


    Icynene would be possable sprayed from below under a staple up radiant system but it is way to soft for under a slab. It's also open cell so it would hold moisture under a slab.
  • Constantin
    Constantin Member Posts: 3,796
    Nope...

    Icynene does not have the compressive strength, AFIAK. You'll have to look at XPS, a.k.a. Dowfoam, I think. That stuff is tough and won't hold water the way that Polyurethanes (open- or closed-cell) will.

    The only application I seem to recall of polyurethanes in contact with soil was the Canadian floor insulation study that featured polyurethane en-cased in metal containers. That's the famous study that exposed the actual efficiency of foil-coated bubble-wrap when used in foundation applications.
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