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Rockwool Comfortboard 80 Under Radiant Slab?

user-6445625 | Posted in General Questions on

Hello,
My builder wants to use Rockwool Comfortboard 80 for insulation under our slab-on-grade for a house in Maine. I’m open to this, and certainly would prefer it over rigid foam, but won’t there be issues with the rockwool compressing – possibly causing cracks in the slab? If anyone has experience with this, I would love some input! [we are also planning in-slab hydronic radiant]
thanks
Brad

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Related Questions

Replies

  1. Expert Member
    MALCOLM TAYLOR | | #1

    Brad,

    You may find this article useful: https://www.greenbuildingadvisor.com/article/sub-slab-mineral-wool

  2. user-6445625 | | #2

    Thanks, Malcolm. Very helpful!

    1. Expert Member
      MALCOLM TAYLOR | | #3

      Brad,

      I should have included this more recent one too: https://www.greenbuildingadvisor.com/article/insulating-a-slab-with-rigid-mineral-wool

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