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150mm PIR or 150mm XPS insulation under slab

Discussion in 'Building' started by SS-ProjectBuild, 28 Sep 2020.

  1. SS-ProjectBuild

    SS-ProjectBuild

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    Hi,

    As the title suggest whats better? I know PIR is way more expensive than XPS but dont really know any other pros/cons?
     
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  3. ^woody^

    ^woody^

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    Its roughly twice as efficient
     
  4. cdbe

    cdbe

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    If you have to dig out and dispose of spoil to make space for it, you'll obviously chose a thinner layer of the more efficient stuff.
     
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    DIYnot Local

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