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Doubling up PIR board - lay back to back?

Discussion in 'Building' started by JP_, 29 Nov 2017.

  1. JP_

    JP_

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    I ordered some 50mm PIR board from the local building merchant, but due to stock shortage, they are giving me 25mm instead - double the number of boards so still 50mm total.

    I am using this for wooden suspended underfloor insulation - would I be best to lay it with the foil on the outside top and bottom, or with foil on top on both layers?
     
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  3. Notch7

    Notch7

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    I thought PIR always had foil both sides?
     
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  4. JP_

    JP_

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    oh, maybe it does!
    Yes, looks like it will. Well, that's also double the vapour barrier then!
     
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