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Can I use this Insulation board?

Discussion in 'Building' started by commando3, 29 Sep 2021.

  1. commando3

    commando3

    Joined:
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    Country:
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    I'm building a garden room and have now secured the ground frame/ joists.
    Next stage is the insulation board between the floor joists which we all know is very expensive. However, I've been offered some pir board at a really good price but it has a grease proof like paper covering the foil which I believe is for dot and dab applications?,
    So, question is, can I use this between my floor joists? The pir will be taped and a vapour barrier placed on top before the floorboards go on.
    TIA
     
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  3. 23vc

    23vc

    Joined:
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    Location:
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    Can’t imagine it’d be a problem but can’t picture what the paper thing is
     
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