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Community and Q&A

Facing on Reclaimed Polyiso Foam

dfvellone | Posted in General Questions on

I have access to some reclaimed 1/2″ polyiso that is faced on both sides with a heavy paper type facing. It’s heavier than kraft facing. I’ve sourced both foil faced and kraft faced reclaimed polyiso, but haven’t seen this facing and wonder if it’s something to avoid or not.
Thanks, Daniel

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  1. Expert Member
    BILL WICHERS | | #1

    The third major type of facer used with polyiso is a fiberglass mat. Fiberglass mat is vapor open similarly to kraft paper, but is physically a little tougher. I don’t see any reason to avoid it, but it won’t tape quite as easily as foil faced polyiso.


    1. dfvellone | | #2

      Thanks! I hadn't considered that it might be a fiberglass material, but noticed that when I tore off a corner it had a fibrous quality to even though it seemed like a type of paper.

  2. Deleted | | #3


  3. ddubx6 | | #4

    hello Daniel, did you end up using this? I recently got what seems to be the same stuff and am wondering how you used it and if there where any issues? thanks

    1. dfvellone | | #5

      I used it as a thermal break on the interior face of the rafters on my sloped ceiling. The bays had been previously filled with ccsf. No issues so far.
      I'm not exactly sure what the facing material is. It looks and feels like a paper product, and burns to ash.

  4. Expert Member
    Dana Dorsett | | #6

    It's paper.

    it's a darker gray or black may have some bitumen or asphalt binder to lower the overall vapor permeance & enhance water repellency.

    1. dfvellone | | #7

      It's light brown.

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